chore: merge dev into v2 (#35591)

Co-authored-by: Frank <frank@anoma.ly>
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Co-authored-by: 𝓛𝓲𝓽𝓽𝓵𝓮 𝓕𝓻𝓪𝓷𝓴 <little-frank@opencord.local>
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This commit is contained in:
Aiden Cline
2026-07-06 16:05:29 -05:00
committed by GitHub
co-authored by Frank Aarav Sareen Brendan Allan opencode-agent[bot] <opencode-agent[bot]@users.noreply.github.com> Jack Brendan Allan Shoubhit Dash opencode-agent[bot] <219766164+opencode-agent[bot]@users.noreply.github.com> James Long Dustin Deus starptech Luke Parker 𝓛𝓲𝓽𝓽𝓵𝓮 𝓕𝓻𝓪𝓷𝓴 Dax usrnk1 Jay runvip opencode Julian Coy Vladimir Glafirov Adam Kit Langton Simon Klee Jay David Hill
parent f87998f37f
commit 9e0d3976e1
332 changed files with 24650 additions and 4497 deletions
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# Timeline Layout Continuity
Run from `packages/app`:
```sh
bun run test:stability
```
The suite runs a production build in one Chromium worker. Selected scenarios use deterministic 4x CPU stress after application readiness. This is a stress profile, not emulation of a specific device.
## What It Proves
The continuity probe samples DOM-derived layout and visibility state across browser render opportunities. Tests declare explicit contracts such as:
- Preserve a visible semantic anchor while the user is away from the bottom.
- Preserve end anchoring while active content grows or new content appears.
- Keep adjacent visible rows ordered without material overlap.
- Keep user-selected disclosure state through updates and virtualization.
- Avoid a sampled blank interval while one visible surface replaces another.
- Preserve logical row and control identity where local state or focus depends on it.
- Keep keyboard, wheel, and nested-scroll ownership consistent during remeasurement.
The suite exercises real browser reducer, projection, component, virtualizer, layout, focus, and interaction code. The backend and event producer are controlled fixtures.
## What It Does Not Prove
The pass/fail oracle does not inspect every compositor-presented pixel. A sample taken after `requestAnimationFrame` is a DOM/layout observation, not proof that every sampled state was displayed or that every displayed frame was sampled.
The suite does not provide complete coverage for:
- Compositor-only or raster-only glitches.
- Color, contrast, canvas, WebGL, masks, irregular clips, or arbitrary occlusion.
- Physical display refresh rates, native OS scaling, or a named low-end device.
- TCP packetization, proxy buffering, or the complete real server/provider pipeline.
Playwright video, trace, screenshots, and observation JSON are diagnostic evidence. They are not pixel baselines and do not participate in normal pass/fail decisions.
For optional before/violation/after screenshots, set `OPENCODE_STABILITY_CAPTURE=1`. Capture is opt-in because compositor readback can perturb timing.
## Test Layers
- **Projection:** admitted rows, grouping, labels, and final visible states.
- **Local state:** disclosure state, identity, duplicate delivery, and virtualization restoration.
- **Interaction:** wheel, keyboard, nested scrolling, actionability, and focus behavior.
- **Layout continuity:** anchoring, adjacency, responsive reflow, and visible surface handoffs.
- **Reducer hardening:** validly shaped but intentionally reordered, duplicated, removed, or replaced events.
- **Oracle contract:** pure analyzer and browser sampler calibration tests.
Production-lifecycle fixtures should model states emitted by the current producer. Impossible or reordered sequences belong in reducer-hardening tests and must not be described as normal provider behavior.
## Diagnostics
Failures retain:
- `video.webm`
- `trace.zip`
- failure screenshot
- sampled DOM/layout trace JSON
- event markers and summarized violations
The analyzer records both unclipped layout bounds and ancestor-clipped visible intersections. Scrollbar and raw `scrollTop` changes alone do not fail continuity checks; user-visible semantic anchor movement does.
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import { expect, test } from "@playwright/test"
import {
defineVisualRegions,
reportVisualStability,
startVisualProbe,
stopVisualProbe,
visualPlan,
} from "../../utils/visual-stability"
import {
assistantMessage,
partUpdated,
setupTimeline,
shell,
textPart,
toolPart,
userMessage,
waitForVisualSettle,
type TimelineMessage,
} from "./fixture"
test.describe("timeline adverse visual stability", () => {
test("does not pull a scrolled-away user while an active shell grows", async ({ page }, testInfo) => {
const activeShellID = "prt_adverse_01_shell"
const messages = [
...history(24),
userMessage(),
assistantMessage([shell(activeShellID, "running")], { completed: false }),
]
const timeline = await setupTimeline(page, {
messages,
settings: { shellToolPartsExpanded: true },
cpuRate: 4,
eventRetry: 30,
})
const scroller = page.locator(".scroll-view__viewport", {
has: page.locator('[data-timeline-row="AssistantPart"]'),
})
await scroller.evaluate((element) => {
element.dispatchEvent(new WheelEvent("wheel", { bubbles: true, cancelable: true, deltaY: -450 }))
element.scrollTop = Math.max(0, element.scrollHeight - element.clientHeight - 450)
})
await page.waitForTimeout(150)
await expect
.poll(() => scroller.evaluate((element) => element.scrollHeight - element.clientHeight - element.scrollTop))
.toBeGreaterThan(100)
const anchor = await scroller.evaluate((element) => {
const view = element.getBoundingClientRect()
return [...element.querySelectorAll<HTMLElement>("[data-timeline-key]")].find((row) => {
const rect = row.getBoundingClientRect()
return rect.top >= view.top + 40 && rect.bottom <= view.bottom - 40
})?.dataset.timelineKey
})
expect(anchor).toBeTruthy()
await waitForVisualSettle(page, [`[data-timeline-key="${anchor}"]`])
const regions = defineVisualRegions({
anchor: { selector: `[data-timeline-key="${anchor}"]` },
})
await startVisualProbe(page, regions)
await timeline.send(partUpdated(shell(activeShellID, "running", lines(1))), 180)
await timeline.send(partUpdated(shell(activeShellID, "running", lines(10))), 90)
await timeline.send(partUpdated(shell(activeShellID, "running", lines(50))), 350)
await timeline.send(partUpdated(shell(activeShellID, "completed", lines(50))), 500)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"scrolled-away-shell",
trace,
visualPlan(regions, [
{ type: "required", regions: ["anchor"] },
{ type: "unique", regions: ["anchor"] },
{ type: "stable", regions: ["anchor"] },
{ type: "fixed", regions: ["anchor"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals: 0 },
{ type: "label-stability", regions: "all" },
]),
)
})
test("preserves an explicit shell state across virtualization", async ({ page }) => {
const targetID = "prt_virtual_shell"
const messages = [
userMessage(undefined, { id: "msg_0000_virtual_user", created: 1700000000000 }),
assistantMessage([shell(targetID, "completed", lines(20))], {
id: "msg_0001_virtual_assistant",
parentID: "msg_0000_virtual_user",
created: 1700000001000,
}),
...history(35, 10),
]
await setupTimeline(page, { messages, settings: { shellToolPartsExpanded: false } })
const scroller = page.locator(".scroll-view__viewport", { has: page.locator("[data-timeline-row]") })
await scroller.evaluate((element) => {
element.dispatchEvent(new WheelEvent("wheel", { bubbles: true, cancelable: true, deltaY: -1_000 }))
element.scrollTop = 0
})
await page.waitForTimeout(300)
const trigger = page.locator(`[data-timeline-part-id="${targetID}"] [data-slot="collapsible-trigger"]`)
await expect(trigger).toBeVisible()
await trigger.click()
await expect(trigger).toHaveAttribute("aria-expanded", "true")
await scroller.evaluate((element) => (element.scrollTop = element.scrollHeight))
await expect(page.locator(`[data-timeline-part-id="${targetID}"]`)).toHaveCount(0)
await scroller.evaluate((element) => (element.scrollTop = 0))
await expect(trigger).toBeVisible()
await expect(trigger).toHaveAttribute("aria-expanded", "true")
})
test("keeps narrow viewport rows ordered during long shell growth", async ({ page }, testInfo) => {
const shellID = "prt_narrow_01_shell"
const followingID = "prt_narrow_02_following"
const timeline = await setupTimeline(page, {
messages: [
userMessage(),
assistantMessage(
[shell(shellID, "running"), textPart(followingID, "A narrow following row that wraps across lines.")],
{
completed: false,
},
),
],
settings: { shellToolPartsExpanded: true },
viewport: { width: 430, height: 800 },
cpuRate: 4,
})
await waitForVisualSettle(page, [
`[data-timeline-part-id="${shellID}"]`,
`[data-timeline-part-id="${followingID}"]`,
])
const regions = defineVisualRegions({
shell: { selector: `[data-timeline-part-id="${shellID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
following: {
selector: `[data-timeline-part-id="${followingID}"]`,
closest: '[data-timeline-row="AssistantPart"]',
},
})
await startVisualProbe(page, regions)
await timeline.send(partUpdated(shell(shellID, "running", wideLines(10))), 100)
await timeline.send(partUpdated(shell(shellID, "running", wideLines(50))), 300)
await timeline.send(partUpdated(shell(shellID, "completed", wideLines(50))), 500)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"narrow-shell",
trace,
visualPlan(
regions,
[
{ type: "required", regions: ["shell", "following"] },
{ type: "unique", regions: ["shell", "following"] },
{ type: "stable", regions: ["shell", "following"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals: 0 },
{ type: "label-stability", regions: "all" },
{ type: "preserve-bottom-anchor" },
{ type: "flow", regions: ["shell", "following"] },
],
{ perMarker: true },
),
)
})
test("keeps visible rows ordered while resizing desktop to narrow and back", async ({ page }, testInfo) => {
const shellID = "prt_resize_01_shell"
const contextIDs = ["prt_resize_02_read", "prt_resize_03_glob"]
const followingID = "prt_resize_04_following"
await setupTimeline(page, {
messages: [
userMessage(),
assistantMessage([
shell(shellID, "completed", wideLines(15)),
toolPart(contextIDs[0]!, "read", "completed", { filePath: "src/a.ts" }),
toolPart(contextIDs[1]!, "glob", "completed", { path: ".", pattern: "**/*.ts" }),
textPart(followingID, "Following responsive timeline content that wraps on narrow screens."),
]),
],
settings: { shellToolPartsExpanded: true },
cpuRate: 4,
seedHistory: true,
})
const group = `[data-timeline-part-ids="${contextIDs.join(",")}"]`
const regions = defineVisualRegions({
shell: { selector: `[data-timeline-part-id="${shellID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
context: { selector: group, closest: '[data-timeline-row="AssistantPart"]' },
following: {
selector: `[data-timeline-part-id="${followingID}"]`,
closest: '[data-timeline-row="AssistantPart"]',
},
})
await startVisualProbe(page, regions)
await page.setViewportSize({ width: 430, height: 800 })
await page.waitForTimeout(500)
await page.setViewportSize({ width: 900, height: 800 })
await page.waitForTimeout(500)
await page.setViewportSize({ width: 1400, height: 900 })
await page.waitForTimeout(500)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"responsive-resize",
trace,
visualPlan(regions, [
{ type: "required", regions: ["shell", "context", "following"] },
{ type: "unique", regions: ["shell", "context", "following"] },
{ type: "stable", regions: ["shell", "context", "following"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals: 4, maxReversals: 4 },
{ type: "label-stability", regions: "all" },
{ type: "flow", regions: ["shell", "context", "following"] },
]),
)
})
})
function history(count: number, offset = 0): TimelineMessage[] {
return Array.from({ length: count }, (_, index) => {
const value = index + offset
const prefix = `msg_0${String(value).padStart(3, "0")}_history`
const userID = `${prefix}_a_user`
return [
userMessage(undefined, { id: userID, created: 1699990000000 + value * 10_000 }),
assistantMessage(
[
textPart(
`prt_history_${String(value).padStart(3, "0")}`,
`Historical response ${value}. ${"Stable history content. ".repeat(8)}`,
),
],
{
id: `${prefix}_b_assistant`,
parentID: userID,
created: 1699990001000 + value * 10_000,
},
),
]
}).flat()
}
function lines(count: number) {
return Array.from({ length: count }, (_, index) => `line ${index + 1}`).join("\n")
}
function wideLines(count: number) {
return Array.from({ length: count }, (_, index) => `line ${index + 1} ${"wide-output-".repeat(20)}`).join("\n")
}
@@ -0,0 +1,192 @@
import { expect, test } from "@playwright/test"
import {
defineVisualRegions,
reportVisualStability,
startVisualProbe,
stopVisualProbe,
visualPlan,
} from "../../utils/visual-stability"
import {
assistantID,
assistantMessage,
event,
partUpdated,
setupTimeline,
textPart,
toolPart,
userMessage,
waitForVisualSettle,
} from "./fixture"
const inputs = {
read: { filePath: "src/a.ts", offset: 0, limit: 120 },
glob: { path: ".", pattern: "**/*.ts" },
grep: { path: ".", pattern: "stable", include: "*.ts" },
list: { path: "src" },
}
test("appends context operations while the group is expanded", async ({ page }, testInfo) => {
const firstID = "prt_append_01_read"
const followingID = "prt_append_99_following"
const timeline = await setupTimeline(page, {
messages: [
userMessage(),
assistantMessage([toolPart(firstID, "read", "running", inputs.read), textPart(followingID, "Following append")], {
completed: false,
}),
],
cpuRate: 4,
})
const initialGroup = `[data-timeline-part-ids="${firstID}"]`
await page.locator(`${initialGroup} [data-slot="collapsible-trigger"]`).click()
await waitForVisualSettle(page, [initialGroup, `[data-timeline-part-id="${followingID}"]`])
const regions = defineVisualRegions({
context: {
selector: '[data-timeline-part-ids^="prt_append_01_read"]',
closest: '[data-timeline-row="AssistantPart"]',
},
following: { selector: `[data-timeline-part-id="${followingID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
})
await startVisualProbe(page, regions)
await timeline.send(partUpdated(toolPart("prt_append_02_glob", "glob", "running", inputs.glob)), 180)
await timeline.send(partUpdated(toolPart("prt_append_03_grep", "grep", "completed", inputs.grep)), 240)
await timeline.send(partUpdated(toolPart("prt_append_04_list", "list", "completed", inputs.list)), 500)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"context-append",
trace,
visualPlan(
regions,
[
{ type: "required", regions: ["context", "following"] },
{ type: "unique", regions: ["context", "following"] },
{ type: "stable", regions: ["context", "following"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: ["following"], maxPositionReversals: 0 },
{ type: "label-stability", regions: "all" },
{ type: "preserve-bottom-anchor" },
{ type: "flow", regions: ["context", "following"] },
],
{ perMarker: true },
),
)
await expect(
page.locator(
'[data-timeline-part-ids="prt_append_01_read,prt_append_02_glob,prt_append_03_grep,prt_append_04_list"]',
),
).toBeVisible()
await expect(
page.locator('[data-timeline-part-ids^="prt_append_01_read"] [data-slot="collapsible-trigger"]'),
).toHaveAttribute("aria-expanded", "true")
})
test("splits and merges context groups when a middle text part changes", async ({ page }, testInfo) => {
const textID = "prt_split_02_text"
const followingID = "prt_split_99_following"
const timeline = await setupTimeline(page, {
messages: [
userMessage(),
assistantMessage([
toolPart("prt_split_01_read", "read", "completed", inputs.read),
textPart(textID, "Boundary"),
toolPart("prt_split_03_glob", "glob", "completed", inputs.glob),
textPart(followingID, "Following split groups"),
]),
],
cpuRate: 4,
})
const regions = defineVisualRegions({
following: { selector: `[data-timeline-part-id="${followingID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
})
await startVisualProbe(page, regions)
await timeline.send(
event("message.part.removed", { sessionID: "ses_timeline_stability", messageID: assistantID, partID: textID }),
500,
)
await expect(page.locator('[data-timeline-part-ids="prt_split_01_read,prt_split_03_glob"]')).toBeVisible()
await timeline.send(partUpdated(textPart(textID, "Boundary restored")), 500)
await expect(page.locator('[data-timeline-part-ids="prt_split_01_read"]')).toBeVisible()
await expect(page.locator('[data-timeline-part-ids="prt_split_03_glob"]')).toBeVisible()
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"context-split-merge",
trace,
visualPlan(
regions,
[
{ type: "required", regions: ["following"] },
{ type: "unique", regions: ["following"] },
{ type: "stable", regions: ["following"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals: 1 },
{ type: "label-stability", regions: "all" },
],
{ perMarker: true },
),
)
})
test("removing the first context member replaces the group once without overlapping following content", async ({
page,
}, testInfo) => {
const ids = ["prt_key_01_read", "prt_key_02_glob", "prt_key_03_grep"]
const followingID = "prt_key_99_following"
const timeline = await setupTimeline(page, {
messages: [
userMessage(),
assistantMessage([
toolPart(ids[0]!, "read", "completed", inputs.read),
toolPart(ids[1]!, "glob", "completed", inputs.glob),
toolPart(ids[2]!, "grep", "completed", inputs.grep),
textPart(followingID, "Following replaced group"),
]),
],
cpuRate: 4,
})
const original = page.locator(`[data-timeline-part-ids="${ids.join(",")}"]`)
const originalRowKey = await original.evaluate((element) =>
element.closest("[data-timeline-key]")?.getAttribute("data-timeline-key"),
)
await original.locator('[data-slot="collapsible-trigger"]').click()
await expect(original.locator('[data-slot="collapsible-trigger"]')).toHaveAttribute("aria-expanded", "true")
const regions = defineVisualRegions({
context: {
selector: '[data-timeline-part-ids*="prt_key_02_glob"]',
closest: '[data-timeline-row="AssistantPart"]',
},
following: { selector: `[data-timeline-part-id="${followingID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
})
await startVisualProbe(page, regions)
await timeline.send(
event("message.part.removed", { sessionID: "ses_timeline_stability", messageID: assistantID, partID: ids[0] }),
500,
)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"context-first-remove",
trace,
visualPlan(regions, [
{ type: "required", regions: ["context", "following"] },
{ type: "unique", regions: ["context", "following"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals: 0 },
{ type: "label-stability", regions: "all" },
{ type: "flow", regions: ["context", "following"] },
]),
)
await expect(page.locator(`[data-timeline-part-ids="${ids.slice(1).join(",")}"]`)).toBeVisible()
expect(
await page
.locator(`[data-timeline-part-ids="${ids.slice(1).join(",")}"]`)
.evaluate((element) => element.closest("[data-timeline-key]")?.getAttribute("data-timeline-key")),
).toBe(originalRowKey)
await expect(
page.locator(`[data-timeline-part-ids="${ids.slice(1).join(",")}"] [data-slot="collapsible-trigger"]`),
).toHaveAttribute("aria-expanded", "true")
})
@@ -0,0 +1,113 @@
import { test } from "@playwright/test"
import {
defineVisualRegions,
reportVisualStability,
startVisualProbe,
stopVisualProbe,
visualPlan,
} from "../../utils/visual-stability"
import {
assistantMessage,
partUpdated,
setupTimeline,
shell,
textPart,
userMessage,
waitForVisualSettle,
} from "./fixture"
// Fractional scaling exercises different browser rounding than the baseline.
for (const deviceScaleFactor of [1, 1.25]) {
test(`keeps shell growth ordered at device scale ${deviceScaleFactor}`, async ({ page }, testInfo) => {
const shellID = `prt_dpr_${String(deviceScaleFactor).replace(".", "_")}_01_shell`
const followingID = `prt_dpr_${String(deviceScaleFactor).replace(".", "_")}_02_following`
const timeline = await setupTimeline(page, {
messages: [
userMessage(),
assistantMessage([shell(shellID, "running"), textPart(followingID, "Following scaled shell")], {
completed: false,
}),
],
settings: { shellToolPartsExpanded: true },
cpuRate: 4,
deviceScaleFactor,
seedHistory: true,
})
await waitForVisualSettle(page, [
`[data-timeline-part-id="${shellID}"]`,
`[data-timeline-part-id="${followingID}"]`,
])
const regions = defineVisualRegions({
shell: { selector: `[data-timeline-part-id="${shellID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
following: {
selector: `[data-timeline-part-id="${followingID}"]`,
closest: '[data-timeline-row="AssistantPart"]',
},
})
await startVisualProbe(page, regions)
await timeline.send(partUpdated(shell(shellID, "running", lines(20))), 180)
await timeline.send(partUpdated(shell(shellID, "completed", lines(20))), 500)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(testInfo, `dpr-${deviceScaleFactor}`, trace, shellPlan(regions))
})
}
for (const reducedMotion of [true]) {
test(`keeps shell and status transitions ordered with reduced motion ${reducedMotion}`, async ({
page,
}, testInfo) => {
const shellID = `prt_motion_${reducedMotion}_01_shell`
const followingID = `prt_motion_${reducedMotion}_02_following`
const timeline = await setupTimeline(page, {
messages: [
userMessage(),
assistantMessage([shell(shellID, "running"), textPart(followingID, "Following motion profile")], {
completed: false,
}),
],
settings: { shellToolPartsExpanded: true },
reducedMotion,
cpuRate: 4,
seedHistory: true,
})
await waitForVisualSettle(page, [
`[data-timeline-part-id="${shellID}"]`,
`[data-timeline-part-id="${followingID}"]`,
])
const regions = defineVisualRegions({
shell: { selector: `[data-timeline-part-id="${shellID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
following: {
selector: `[data-timeline-part-id="${followingID}"]`,
closest: '[data-timeline-row="AssistantPart"]',
},
})
await startVisualProbe(page, regions)
await timeline.send(partUpdated(shell(shellID, "completed", lines(10))), 500)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(testInfo, `reduced-motion-${reducedMotion}`, trace, shellPlan(regions))
})
}
function lines(count: number) {
return Array.from({ length: count }, (_, index) => `line ${index + 1}`).join("\n")
}
function shellPlan<Regions extends ReturnType<typeof defineVisualRegions>>(
regions: Regions & Record<"shell" | "following", { selector: string }>,
) {
return visualPlan(
regions,
[
{ type: "required", regions: ["shell", "following"] },
{ type: "unique", regions: ["shell", "following"] },
{ type: "stable", regions: ["shell", "following"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals: 0 },
{ type: "label-stability", regions: "all" },
{ type: "preserve-bottom-anchor" },
{ type: "flow", regions: ["shell", "following"] },
],
{ perMarker: true },
)
}
@@ -0,0 +1,121 @@
import { test } from "@playwright/test"
import {
defineVisualRegions,
reportVisualStability,
startVisualProbe,
stopVisualProbe,
visualPlan,
} from "../../utils/visual-stability"
import {
assistantMessage,
partUpdated,
setupTimeline,
textPart,
toolPart,
userMessage,
waitForVisualSettle,
} from "./fixture"
const profiles = [
{ name: "edit", tool: "edit", input: { filePath: "src/edit.ts" } },
{
name: "multi patch",
tool: "apply_patch",
input: { files: ["src/a.ts", "src/b.ts", "src/old.ts", "src/moved.ts"] },
},
] as const
for (const profile of profiles) {
test(`stabilizes ${profile.name} pending to completed`, async ({ page }, testInfo) => {
const partID = `prt_file_matrix_${profiles.indexOf(profile)}`
const followingID = `prt_file_matrix_following_${profiles.indexOf(profile)}`
const timeline = await setupTimeline(page, {
messages: [
userMessage(),
assistantMessage(
[
toolPart(partID, profile.tool, "pending", profile.input),
textPart(followingID, `Following ${profile.name}`),
],
{ completed: false },
),
],
settings: { editToolPartsExpanded: true },
cpuRate: 4,
})
await waitForVisualSettle(page, [`[data-timeline-part-id="${partID}"]`, `[data-timeline-part-id="${followingID}"]`])
const regions = defineVisualRegions({
tool: { selector: `[data-timeline-part-id="${partID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
following: {
selector: `[data-timeline-part-id="${followingID}"]`,
closest: '[data-timeline-row="AssistantPart"]',
},
})
await startVisualProbe(page, regions)
await timeline.send(partUpdated(toolPart(partID, profile.tool, "running", profile.input)), 180)
await timeline.send(partUpdated(completedPart(partID, profile)), 900)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
`file-${profile.name}`,
trace,
visualPlan(
regions,
[
{ type: "required", regions: ["tool", "following"] },
{ type: "unique", regions: ["tool", "following"] },
{ type: "stable", regions: ["tool", "following"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals: 0, maxReversals: 1 },
{ type: "label-stability", regions: "all" },
{ type: "preserve-bottom-anchor" },
{ type: "flow", regions: ["tool", "following"] },
],
{ perMarker: true },
),
)
})
}
function completedPart(partID: string, profile: (typeof profiles)[number]) {
if (profile.tool === "edit") {
return toolPart(partID, profile.tool, "completed", profile.input, {
metadata: {
filediff: {
file: "src/edit.ts",
additions: 50,
deletions: 50,
before: source(50, false),
after: source(50, true),
},
},
})
}
const files = [
patchFile("src/a.ts", "update"),
patchFile("src/b.ts", "add"),
patchFile("src/old.ts", "delete"),
{ ...patchFile("src/moved.ts", "move"), move: "src/new-place.ts" },
]
return toolPart(partID, profile.tool, "completed", profile.input, { metadata: { files } })
}
function patchFile(filePath: string, type: "add" | "update" | "delete" | "move") {
return {
filePath,
relativePath: filePath,
type,
additions: type === "delete" ? 0 : 20,
deletions: type === "add" ? 0 : 20,
before: type === "add" ? undefined : source(20, false),
after: type === "delete" ? undefined : source(20, true),
}
}
function source(count: number, changed: boolean) {
return Array.from(
{ length: count },
(_, index) => `export const value${index} = ${changed ? index + 1 : index}\n`,
).join("")
}
@@ -0,0 +1,113 @@
import { expect, test } from "@playwright/test"
import {
defineVisualRegions,
reportVisualStability,
startVisualProbe,
stopVisualProbe,
visualPlan,
} from "../../utils/visual-stability"
import {
assistantMessage,
partUpdated,
setupTimeline,
textPart,
toolPart,
userMessage,
waitForVisualSettle,
} from "./fixture"
test("adds patch files incrementally without resetting outer expansion", async ({ page }, testInfo) => {
const patchID = "prt_incremental_01_patch"
const followingID = "prt_incremental_02_following"
const first = patchFile("src/a.ts", "update")
const timeline = await setupTimeline(page, {
messages: [
userMessage(),
assistantMessage(
[
toolPart(patchID, "apply_patch", "running", { files: [first.filePath] }, { metadata: { files: [first] } }),
textPart(followingID, "Following incremental patch"),
],
{ completed: false },
),
],
settings: { editToolPartsExpanded: true },
cpuRate: 4,
seedHistory: true,
})
const trigger = page.locator(`[data-timeline-part-id="${patchID}"] [data-slot="collapsible-trigger"]`).first()
await expect(trigger).toHaveAttribute("aria-expanded", "true")
await waitForVisualSettle(page, [`[data-timeline-part-id="${patchID}"]`, `[data-timeline-part-id="${followingID}"]`])
const regions = defineVisualRegions({
patch: { selector: `[data-timeline-part-id="${patchID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
following: { selector: `[data-timeline-part-id="${followingID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
})
await startVisualProbe(page, regions)
const second = patchFile("src/b.ts", "add")
const third = patchFile("src/old.ts", "delete")
await timeline.send(
partUpdated(
toolPart(
patchID,
"apply_patch",
"running",
{ files: [first.filePath, second.filePath] },
{ metadata: { files: [first, second] } },
),
),
240,
)
await timeline.send(
partUpdated(
toolPart(
patchID,
"apply_patch",
"completed",
{ files: [first.filePath, second.filePath, third.filePath] },
{ metadata: { files: [first, second, third] } },
),
),
800,
)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"incremental-patch",
trace,
visualPlan(
regions,
[
{ type: "required", regions: ["patch", "following"] },
{ type: "unique", regions: ["patch", "following"] },
{ type: "stable", regions: ["patch", "following"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: ["following"], maxPositionReversals: 0 },
{ type: "label-stability", regions: "all" },
{ type: "preserve-bottom-anchor" },
{ type: "flow", regions: ["patch", "following"] },
],
{ perMarker: true },
),
)
await expect(trigger).toHaveAttribute("aria-expanded", "true")
await expect(page.locator('[data-scope="apply-patch"] [data-type="delete"]')).toBeVisible()
})
function patchFile(filePath: string, type: "add" | "update" | "delete") {
return {
filePath,
relativePath: filePath,
type,
additions: type === "delete" ? 0 : 4,
deletions: type === "add" ? 0 : 3,
before: type === "add" ? undefined : source(false),
after: type === "delete" ? undefined : source(true),
}
}
function source(changed: boolean) {
return Array.from({ length: 12 }, (_, index) => `export const value${index} = ${changed ? index + 1 : index}\n`).join(
"",
)
}
@@ -0,0 +1,68 @@
import { describe, expect, test } from "bun:test"
import {
assistantMessage,
event,
toolPart,
userMessage,
validateTimelineEvent,
validateTimelineMessages,
type PartSeed,
} from "./fixture"
describe("timeline fixture validation", () => {
test("accepts a valid timeline", () => {
expect(validateTimelineMessages([userMessage(), assistantMessage()])).toHaveLength(2)
})
test("rejects malformed SDK values at runtime", () => {
expect(() =>
assistantMessage([], {
error: { name: "APIError", data: { message: "failed" } } as never,
}),
).toThrow()
expect(() =>
validateTimelineEvent({
directory: "C:/OpenCode/TimelineStability",
payload: {
id: "evt_invalid_status",
type: "session.status",
properties: { sessionID: "ses_timeline_stability", status: { type: "retry", attempt: 1 } },
},
}),
).toThrow()
})
test("rejects duplicate IDs and orphan assistants", () => {
expect(() => validateTimelineMessages([userMessage(), userMessage()])).toThrow(/duplicate message ID/)
expect(() =>
validateTimelineMessages([userMessage(), assistantMessage([], { parentID: "msg_missing_parent" })]),
).toThrow(/parent user/)
})
test("assigns deterministic event IDs", () => {
const first = event("session.status", { sessionID: "ses_timeline_stability", status: { type: "busy" } })
const second = event("session.status", { sessionID: "ses_timeline_stability", status: { type: "idle" } })
expect(first.payload.id).toMatch(/^evt_timeline_\d{4}$/)
expect(Number(second.payload.id.slice(-4))).toBe(Number(first.payload.id.slice(-4)) + 1)
})
})
if (false) {
const userSeed = { id: "prt_type_user", type: "text", text: "typed" } satisfies PartSeed<"user">
userMessage([userSeed])
// @ts-expect-error Tool completion fields are not valid while pending.
toolPart("prt_invalid_pending", "bash", "pending", {}, { output: "impossible" })
// @ts-expect-error Tool completion fields are not valid while running.
toolPart("prt_invalid_running", "bash", "running", {}, { output: "impossible" })
// @ts-expect-error Tool error fields are not valid after completion.
toolPart("prt_invalid_completed", "bash", "completed", {}, { error: "impossible" })
assistantMessage([
// @ts-expect-error Agent references belong to user messages, not assistant messages.
{ id: "prt_invalid_owner", type: "agent", name: "explore", source: { value: "@explore", start: 0, end: 8 } },
])
// @ts-expect-error Retry status events require message and next.
event("session.status", { sessionID: "ses_timeline_stability", status: { type: "retry", attempt: 1 } })
}
@@ -0,0 +1,561 @@
import { base64Encode } from "@opencode-ai/core/util/encode"
import { Event } from "@opencode-ai/schema/event"
import { SessionStatusEvent } from "@opencode-ai/schema/session-status-event"
import { SessionV1 } from "@opencode-ai/schema/session-v1"
import type {
AssistantMessage,
GlobalEvent,
Message,
Part,
Session,
SessionStatus,
ToolPart,
ToolState,
UserMessage,
} from "@opencode-ai/sdk/v2/client"
import { expect, type Page } from "@playwright/test"
import { Schema } from "effect"
import { mockOpenCodeServer } from "../../utils/mock-server"
import { installSseTransport } from "../../utils/sse-transport"
import { expectSessionTitle } from "../../utils/waits"
export const directory = "C:/OpenCode/TimelineStability"
export const projectID = "proj_timeline_stability"
export const sessionID = "ses_timeline_stability"
export const userID = "msg_1000_timeline_user"
export const assistantID = "msg_1001_timeline_assistant"
export const title = "Timeline visual stability"
export const model = { providerID: "opencode", modelID: "claude-opus-4-6", variant: "max" }
type TimelinePayload = Extract<
GlobalEvent["payload"],
{
type:
| "message.updated"
| "message.removed"
| "message.part.updated"
| "message.part.removed"
| "message.part.delta"
| "session.status"
}
>
type DeepReadonly<Value> = Value extends readonly unknown[]
? { readonly [Key in keyof Value]: DeepReadonly<Value[Key]> }
: Value extends object
? { readonly [Key in keyof Value]: DeepReadonly<Value[Key]> }
: Value
export type TimelineEvent = DeepReadonly<Omit<GlobalEvent, "payload"> & { payload: TimelinePayload }>
export type EventPayload = TimelineEvent
export type ToolStatus = ToolState["status"]
export type TimelineMessage = { info: UserMessage; parts: Part[] } | { info: AssistantMessage; parts: Part[] }
type UserPart = Extract<Part, { type: "text" | "file" | "agent" | "subtask" }>
type AssistantPart = Exclude<Part, { type: "agent" | "subtask" }>
type OwnedPart<Owner extends Message["role"]> = Owner extends "user" ? UserPart : AssistantPart
export type PartSeed<Owner extends Message["role"]> =
OwnedPart<Owner> extends infer Candidate
? Candidate extends Part
? Omit<Candidate, "sessionID" | "messageID">
: never
: never
type ToolOptions<State extends ToolStatus> = State extends "pending"
? { output?: never; title?: never; metadata?: never; error?: never }
: State extends "running"
? { title?: string; metadata?: Record<string, unknown>; output?: never; error?: never }
: State extends "error"
? { error?: string; metadata?: Record<string, unknown>; output?: never; title?: never }
: { output?: string; title?: string; metadata?: Record<string, unknown>; error?: never }
const decodeOptions = { errors: "all", onExcessProperty: "error" } as const
const decodeMessage = Schema.decodeUnknownSync(SessionV1.WithParts)
const decodePart = Schema.decodeUnknownSync(SessionV1.Part)
const decodeStatus = Schema.decodeUnknownSync(SessionStatusEvent.Info)
const timelineEventSchema = Schema.Union([
eventSchema("message.updated", SessionV1.Event.MessageUpdated.data),
eventSchema("message.removed", SessionV1.Event.MessageRemoved.data),
eventSchema("message.part.updated", SessionV1.Event.PartUpdated.data),
eventSchema("message.part.removed", SessionV1.Event.PartRemoved.data),
eventSchema("message.part.delta", SessionV1.Event.PartDelta.data),
eventSchema("session.status", SessionStatusEvent.Status.data),
])
const decodeEvent = Schema.decodeUnknownSync(timelineEventSchema)
let eventSequence = 0
export async function setupTimeline(
page: Page,
input: {
messages?: TimelineMessage[]
settings?: Record<string, boolean>
sessions?: Session[]
cpuRate?: number
viewport?: { width: number; height: number }
eventRetry?: number
reducedMotion?: boolean
locale?: string
deviceScaleFactor?: number
seedHistory?: boolean
} = {},
) {
const sessions = input.sessions ?? [session()]
const messages = validateTimelineMessages([
...(input.seedHistory ? historyMessages(18) : []),
...(input.messages ?? [userMessage(), assistantMessage()]),
])
const active = messages.findLast((message) => message.info.role === "assistant")
const initialStatus = decodeStatus(
active?.info.role === "assistant" && active.info.time.completed === undefined ? { type: "busy" } : { type: "idle" },
decodeOptions,
)
const transport = await installSseTransport<EventPayload>(page, {
server: `http://${process.env.PLAYWRIGHT_SERVER_HOST ?? "127.0.0.1"}:${process.env.PLAYWRIGHT_SERVER_PORT ?? "4096"}`,
retry: input.eventRetry ?? 20,
})
await mockOpenCodeServer(page, {
directory,
project: project(),
provider: provider(),
sessions,
sessionStatus: { [sessionID]: initialStatus },
pageMessages: () => ({
items: messages,
}),
})
await page.addInitScript((settings) => {
localStorage.setItem(
"settings.v3",
JSON.stringify({
general: {
editToolPartsExpanded: false,
shellToolPartsExpanded: false,
showReasoningSummaries: false,
showSessionProgressBar: true,
...settings,
},
}),
)
}, input.settings ?? {})
if (input.locale) {
await page.addInitScript((locale) => {
localStorage.setItem("opencode.global.dat:language", JSON.stringify({ locale }))
}, input.locale)
}
if (input.reducedMotion) await page.emulateMedia({ reducedMotion: "reduce" })
await page.setViewportSize(input.viewport ?? { width: 1400, height: 900 })
if (input.deviceScaleFactor) {
const devtools = await page.context().newCDPSession(page)
const viewport = input.viewport ?? { width: 1400, height: 900 }
await devtools.send("Emulation.setDeviceMetricsOverride", {
width: viewport.width,
height: viewport.height,
deviceScaleFactor: input.deviceScaleFactor,
mobile: false,
})
}
await page.goto(`/${base64Encode(directory)}/session/${sessionID}`)
await transport.waitForConnection()
await expectSessionTitle(page, title)
if (input.cpuRate && input.cpuRate > 1) {
const devtools = await page.context().newCDPSession(page)
await devtools.send("Emulation.setCPUThrottlingRate", { rate: input.cpuRate })
}
return {
transport,
async send(event: TimelineEvent, delay = 0) {
const valid = validateTimelineEvent(event)
await transport.send(valid, { marker: describeEvent(valid) })
if (delay) await page.waitForTimeout(delay)
},
async sendAll(sequence: { event: TimelineEvent; delay: number }[]) {
for (const item of sequence) {
const valid = validateTimelineEvent(item.event)
await transport.send(valid, { marker: describeEvent(valid) })
await page.waitForTimeout(item.delay)
}
},
async settle(frames = 3) {
await page.evaluate(
(frames) =>
new Promise<void>((resolve) => {
let remaining = frames
const tick = () => {
remaining--
if (remaining <= 0) return resolve()
requestAnimationFrame(tick)
}
requestAnimationFrame(tick)
}),
frames,
)
},
async waitForPart(partID: string) {
await expect(page.locator(`[data-timeline-part-id="${partID}"]`).first()).toBeVisible()
},
}
}
function describeEvent(event: EventPayload) {
if (event.payload.type === "message.part.updated") {
const part = event.payload.properties.part
return [
event.payload.type,
part.id,
part.type === "tool" ? part.tool : part.type,
part.type === "tool" ? part.state.status : undefined,
]
.filter(Boolean)
.join(":")
}
if (event.payload.type === "session.status") {
const status = event.payload.properties.status
return [event.payload.type, status.type, status.type === "retry" ? status.attempt : undefined]
.filter((value) => value !== undefined)
.join(":")
}
return event.payload.type
}
export function event<const Type extends TimelinePayload["type"]>(
type: Type,
properties: Extract<TimelinePayload, { type: Type }>["properties"],
): TimelineEvent
export function event(type: TimelinePayload["type"], properties: TimelinePayload["properties"]): TimelineEvent {
return validateTimelineEvent({
directory,
payload: { id: `evt_timeline_${String(++eventSequence).padStart(4, "0")}`, type, properties },
})
}
export function validateTimelineEvent(input: unknown): TimelineEvent {
return decodeEvent(input, decodeOptions)
}
export function validateTimelineMessages(input: readonly TimelineMessage[]): TimelineMessage[] {
input.forEach((message) => decodeMessage(message, decodeOptions))
const messages = [...input]
const messageIDs = new Set<string>()
const partIDs = new Set<string>()
const users = new Set(messages.filter((message) => message.info.role === "user").map((message) => message.info.id))
messages.forEach((message) => {
if (messageIDs.has(message.info.id))
throw new Error(`Timeline fixture has duplicate message ID: ${message.info.id}`)
messageIDs.add(message.info.id)
if (message.info.role === "assistant" && !users.has(message.info.parentID))
throw new Error(`Timeline assistant ${message.info.id} must reference a parent user in the fixture`)
message.parts.forEach((part) => {
if (part.sessionID !== message.info.sessionID || part.messageID !== message.info.id)
throw new Error(`Timeline part ${part.id} ownership does not match message ${message.info.id}`)
if (message.info.role === "user" && !["text", "file", "agent", "subtask"].includes(part.type))
throw new Error(`Timeline user message ${message.info.id} cannot own ${part.type} part ${part.id}`)
if (message.info.role === "assistant" && ["agent", "subtask"].includes(part.type))
throw new Error(`Timeline assistant message ${message.info.id} cannot own ${part.type} part ${part.id}`)
if (partIDs.has(part.id)) throw new Error(`Timeline fixture has duplicate part ID: ${part.id}`)
partIDs.add(part.id)
})
})
return messages
}
export async function waitForVisualSettle(page: Page, selectors: string[], stableFrames = 3) {
await page.waitForFunction(
({ selectors, stableFrames }) => {
const elements = selectors.map((selector) => document.querySelector<HTMLElement>(selector))
if (elements.some((element) => !element)) return false
return new Promise<boolean>((resolve) => {
let stable = 0
let previous = ""
const sample = () => {
const signature = JSON.stringify(
elements.map((element) => {
const rect = element!.getBoundingClientRect()
return [Math.round(rect.top * 10), Math.round(rect.bottom * 10), Math.round(rect.height * 10)]
}),
)
stable = signature === previous ? stable + 1 : 0
previous = signature
const ordered = elements
.slice(1)
.every(
(element, index) =>
elements[index]!.getBoundingClientRect().bottom <= element!.getBoundingClientRect().top + 0.5,
)
if (stable >= stableFrames && ordered) return resolve(true)
requestAnimationFrame(sample)
}
requestAnimationFrame(sample)
})
},
{ selectors, stableFrames },
)
}
export function historyMessages(count: number): TimelineMessage[] {
return Array.from({ length: count }, (_, index) => {
const value = String(index).padStart(4, "0")
const historyUserID = `msg_0${value}_history_a_user`
return [
userMessage(undefined, { id: historyUserID, created: 1690000000000 + index * 10_000 }),
assistantMessage(
[
{
id: `prt_0${value}_history_text`,
type: "text",
text: `Historical response ${index}. ${"Existing session content keeps the virtual timeline realistic. ".repeat(5)}`,
},
],
{
id: `msg_0${value}_history_b_assistant`,
parentID: historyUserID,
created: 1690000001000 + index * 10_000,
},
),
]
}).flat()
}
export function partUpdated(part: Part | PartSeed<"assistant">) {
const owned = "messageID" in part ? part : { ...part, sessionID, messageID: assistantID }
decodePart(owned, decodeOptions)
return event("message.part.updated", {
sessionID,
part: owned,
time: 1700000002000,
})
}
export function partDelta(partID: string, delta: string, messageID = assistantID) {
return event("message.part.delta", { sessionID, messageID, partID, field: "text", delta })
}
export function messageUpdated(info: Message) {
return event("message.updated", { sessionID, info })
}
export function status(type: SessionStatus["type"], attempt = 1) {
return event("session.status", {
sessionID,
status: type === "retry" ? { type, attempt, message: "Rate limited", next: 1700000010000 } : { type },
})
}
export function userMessage(
parts?: PartSeed<"user">[],
input: { id?: string; summary?: UserMessage["summary"]; created?: number } = {},
): Extract<TimelineMessage, { info: { role: "user" } }> {
const id = input.id ?? userID
const seeds = parts ?? [userText("Build the timeline stability matrix.", { id: `prt_${id}_text` })]
const message = {
info: {
id,
sessionID,
role: "user",
time: { created: input.created ?? 1700000000000 },
summary: input.summary ?? { diffs: [] },
agent: "build",
model,
},
parts: seeds.map((part) => ({
...part,
sessionID,
messageID: id,
})),
} satisfies Extract<TimelineMessage, { info: { role: "user" } }>
decodeMessage(message, decodeOptions)
return message
}
export function assistantMessage(
parts: PartSeed<"assistant">[] = [],
input: {
id?: string
parentID?: string
completed?: boolean
error?: AssistantMessage["error"]
created?: number
} = {},
): Extract<TimelineMessage, { info: { role: "assistant" } }> {
const id = input.id ?? assistantID
const message = {
info: {
id,
sessionID,
role: "assistant",
time: {
created: input.created ?? 1700000001000,
...(input.completed === false ? {} : { completed: (input.created ?? 1700000001000) + 1_000 }),
},
parentID: input.parentID ?? userID,
modelID: model.modelID,
providerID: model.providerID,
mode: "build",
agent: "build",
path: { cwd: directory, root: directory },
cost: 0.01,
tokens: { input: 100, output: 200, reasoning: 0, cache: { read: 0, write: 0 } },
variant: "max",
...(input.error ? { error: input.error } : {}),
},
parts: parts.map((part) => ({ ...part, sessionID, messageID: id })),
} satisfies Extract<TimelineMessage, { info: { role: "assistant" } }>
decodeMessage(message, decodeOptions)
return message
}
export function userText(
text: string,
input: Partial<Omit<Extract<PartSeed<"user">, { type: "text" }>, "type" | "text">> = {},
): Extract<PartSeed<"user">, { type: "text" }> {
return { id: "prt_user_text", type: "text", text, ...input }
}
export function textPart(id: string, text: string): Extract<PartSeed<"assistant">, { type: "text" }> {
return { id, type: "text", text }
}
export function reasoningPart(id: string, text: string): Extract<PartSeed<"assistant">, { type: "reasoning" }> {
return { id, type: "reasoning", text, time: { start: 1700000001000 } }
}
export function toolPart(
id: string,
tool: string,
state: "pending",
input: Record<string, unknown>,
options?: ToolOptions<"pending">,
): Omit<ToolPart, "sessionID" | "messageID">
export function toolPart(
id: string,
tool: string,
state: "running",
input: Record<string, unknown>,
options?: ToolOptions<"running">,
): Omit<ToolPart, "sessionID" | "messageID">
export function toolPart(
id: string,
tool: string,
state: "completed",
input: Record<string, unknown>,
options?: ToolOptions<"completed">,
): Omit<ToolPart, "sessionID" | "messageID">
export function toolPart(
id: string,
tool: string,
state: "error",
input: Record<string, unknown>,
options?: ToolOptions<"error">,
): Omit<ToolPart, "sessionID" | "messageID">
export function toolPart(
id: string,
tool: string,
state: ToolStatus,
input: Record<string, unknown>,
options: ToolOptions<ToolStatus> = {},
): Omit<ToolPart, "sessionID" | "messageID"> {
const base = { id, type: "tool" as const, callID: `call_${id}`, tool }
if (state === "pending") return { ...base, state: { status: state, input, raw: "" } }
if (state === "running")
return {
...base,
state: {
status: state,
input,
title: options.title,
metadata: options.metadata ?? {},
time: { start: 1700000001000 },
},
}
if (state === "error")
return {
...base,
state: {
status: state,
input,
error: options.error ?? "Tool failed",
metadata: options.metadata ?? {},
time: { start: 1700000001000, end: 1700000002000 },
},
}
return {
...base,
state: {
status: state,
input,
output: options.output ?? "Completed",
title: options.title ?? tool,
metadata: options.metadata ?? {},
time: { start: 1700000001000, end: 1700000002000 },
},
}
}
export function shell(
id: string,
state: ToolStatus,
output = "",
command = `echo ${id}`,
): Omit<ToolPart, "sessionID" | "messageID"> {
if (state === "pending") return toolPart(id, "bash", state, { command })
if (state === "running")
return toolPart(id, "bash", state, { command }, { title: command, metadata: { command, output } })
if (state === "error")
return toolPart(id, "bash", state, { command }, { error: output || undefined, metadata: { command, output } })
return toolPart(id, "bash", state, { command }, { title: command, output, metadata: { command, output } })
}
export function completedAssistantInfo(info: AssistantMessage): AssistantMessage {
return { ...info, time: { ...info.time, completed: 1700000003000 } }
}
export function project() {
return {
id: projectID,
worktree: directory,
vcs: "git",
name: "timeline-stability",
time: { created: 1700000000000, updated: 1700000000000 },
sandboxes: [],
}
}
export function session(input: Partial<Session> = {}): Session {
return {
id: sessionID,
slug: "timeline-stability",
projectID,
directory,
title,
version: "dev",
time: { created: 1700000000000, updated: 1700000000000 },
...input,
}
}
function eventSchema<
const Type extends TimelinePayload["type"],
const Properties extends Schema.Codec<unknown, unknown>,
>(type: Type, properties: Properties) {
return Schema.Struct({
directory: Schema.String,
project: Schema.optional(Schema.String),
workspace: Schema.optional(Schema.String),
payload: Schema.Struct({ id: Event.ID, type: Schema.Literal(type), properties }),
})
}
function provider() {
return {
all: [
{
id: "opencode",
name: "OpenCode",
models: { "claude-opus-4-6": { id: "claude-opus-4-6", name: "Claude Opus 4.6", limit: { context: 200_000 } } },
},
],
connected: ["opencode"],
default: { providerID: "opencode", modelID: "claude-opus-4-6" },
}
}
@@ -0,0 +1,242 @@
import { expect, test } from "@playwright/test"
import {
defineVisualRegions,
reportVisualStability,
startVisualProbe,
stopVisualProbe,
visualPlan,
} from "../../utils/visual-stability"
import { assistantMessage, setupTimeline, shell, textPart, toolPart, userMessage, waitForVisualSettle } from "./fixture"
test("expands and collapses a long completed shell without overlap", async ({ page }, testInfo) => {
const shellID = "prt_interaction_01_shell"
const followingID = "prt_interaction_02_following"
await setupTimeline(page, {
messages: [
userMessage(),
assistantMessage([shell(shellID, "completed", lines(50)), textPart(followingID, "Following shell expansion")]),
],
settings: { shellToolPartsExpanded: false },
cpuRate: 4,
seedHistory: true,
})
const trigger = page.locator(`[data-timeline-part-id="${shellID}"] [data-slot="collapsible-trigger"]`)
await waitForVisualSettle(page, [`[data-timeline-part-id="${shellID}"]`, `[data-timeline-part-id="${followingID}"]`])
const regions = defineVisualRegions({
shell: { selector: `[data-timeline-part-id="${shellID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
following: { selector: `[data-timeline-part-id="${followingID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
})
const plan = visualPlan(regions, [
{ type: "required", regions: ["shell", "following"] },
{ type: "unique", regions: ["shell", "following"] },
{ type: "stable", regions: ["shell", "following"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals: 0 },
{ type: "label-stability", regions: "all" },
{ type: "preserve-bottom-anchor" },
{ type: "flow", regions: ["shell", "following"] },
])
await startVisualProbe(page, regions)
await trigger.click()
await expect(trigger).toHaveAttribute("aria-expanded", "true")
await page.waitForTimeout(500)
const expanded = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(testInfo, "shell-expand", expanded, plan)
await startVisualProbe(page, regions)
await trigger.click()
await expect(trigger).toHaveAttribute("aria-expanded", "false")
await page.waitForTimeout(500)
const collapsed = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(testInfo, "shell-collapse", collapsed, plan)
})
test("expands and collapses a completed context group without overlap", async ({ page }, testInfo) => {
const ids = [
"prt_interaction_01_read",
"prt_interaction_02_glob",
"prt_interaction_03_grep",
"prt_interaction_04_list",
]
const group = `[data-timeline-part-ids="${ids.join(",")}"]`
const followingID = "prt_interaction_context_following"
await setupTimeline(page, {
messages: [
userMessage(),
assistantMessage([
toolPart(ids[0]!, "read", "completed", { filePath: "src/a.ts" }),
toolPart(ids[1]!, "glob", "completed", { path: ".", pattern: "**/*.ts" }),
toolPart(ids[2]!, "grep", "completed", { path: ".", pattern: "stable" }),
toolPart(ids[3]!, "list", "completed", { path: "src" }),
textPart(followingID, "Following context expansion"),
]),
],
cpuRate: 4,
seedHistory: true,
})
const trigger = page.locator(`${group} [data-slot="collapsible-trigger"]`)
await waitForVisualSettle(page, [group, `[data-timeline-part-id="${followingID}"]`])
for (const [name, expanded] of [
["context-expand", true],
["context-collapse", false],
["context-reexpand", true],
] as const) {
const regions = defineVisualRegions({
context: { selector: group, closest: '[data-timeline-row="AssistantPart"]' },
following: {
selector: `[data-timeline-part-id="${followingID}"]`,
closest: '[data-timeline-row="AssistantPart"]',
},
})
await startVisualProbe(page, regions)
await trigger.click()
await expect(trigger).toHaveAttribute("aria-expanded", String(expanded))
await page.waitForTimeout(500)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
name,
trace,
visualPlan(regions, [
{ type: "required", regions: ["context", "following"] },
{ type: "unique", regions: ["context", "following"] },
{ type: "stable", regions: ["context", "following"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals: 0 },
{ type: "label-stability", regions: "all" },
{ type: "preserve-bottom-anchor" },
{ type: "flow", regions: ["context", "following"] },
]),
)
}
})
test("expands and collapses an edit diff without moving twice", async ({ page }, testInfo) => {
const editID = "prt_interaction_edit"
const followingID = "prt_interaction_edit_following"
await setupTimeline(page, {
messages: [
userMessage(),
assistantMessage([
toolPart(
editID,
"edit",
"completed",
{ filePath: "src/edit.ts" },
{
metadata: {
filediff: {
file: "src/edit.ts",
additions: 40,
deletions: 40,
before: source(40, false),
after: source(40, true),
},
},
},
),
textPart(followingID, "Following edit expansion"),
]),
],
settings: { editToolPartsExpanded: false },
cpuRate: 4,
seedHistory: true,
})
const trigger = page.locator(`[data-timeline-part-id="${editID}"] [data-slot="collapsible-trigger"]`).first()
await waitForVisualSettle(page, [`[data-timeline-part-id="${editID}"]`, `[data-timeline-part-id="${followingID}"]`])
const regions = defineVisualRegions({
edit: { selector: `[data-timeline-part-id="${editID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
following: { selector: `[data-timeline-part-id="${followingID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
})
await startVisualProbe(page, regions)
await trigger.click()
await expect(trigger).toHaveAttribute("aria-expanded", "true")
await page.waitForTimeout(900)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"edit-expand",
trace,
visualPlan(regions, [
{ type: "required", regions: ["edit", "following"] },
{ type: "unique", regions: ["edit", "following"] },
{ type: "stable", regions: ["edit", "following"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals: 0, maxReversals: 1 },
{ type: "label-stability", regions: "all" },
{ type: "preserve-bottom-anchor" },
{ type: "flow", regions: ["edit", "following"] },
]),
)
})
test("shows all and expands historical diff summary without overlap", async ({ page }, testInfo) => {
const firstUser = userMessage(undefined, {
summary: {
diffs: Array.from({ length: 12 }, (_, index) => ({
file: `src/diff-${index}.ts`,
additions: 1,
deletions: 1,
patch: `@@ -1 +1 @@\n-export const value = ${index}\n+export const value = ${index + 1}`,
})),
},
})
const nextUserID = "msg_2000_diff_interaction_user"
await setupTimeline(page, {
messages: [
firstUser,
assistantMessage(),
userMessage(undefined, { id: nextUserID, created: 1700000010000 }),
assistantMessage([], {
id: "msg_2001_diff_interaction_assistant",
parentID: nextUserID,
created: 1700000011000,
}),
],
cpuRate: 4,
})
const scroller = page.locator(".scroll-view__viewport", { has: page.locator("[data-timeline-row]") })
await scroller.evaluate((element) => (element.scrollTop = 0))
const diff = page.locator('[data-timeline-row="DiffSummary"]')
const following = page.locator(`[data-message-id="${nextUserID}"]`).first()
await expect(diff).toBeVisible()
const regions = defineVisualRegions({
diff: { selector: '[data-timeline-row="DiffSummary"]' },
following: { selector: `[data-message-id="${nextUserID}"]` },
})
await startVisualProbe(page, regions)
await page.getByText(/show all/i).click()
await page.waitForTimeout(500)
await diff.locator('[data-slot="session-turn-diff-trigger"]').first().click()
await page.waitForTimeout(900)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"diff-summary-expand",
trace,
visualPlan(regions, [
{ type: "required", regions: ["diff", "following"] },
{ type: "unique", regions: ["diff", "following"] },
{ type: "stable", regions: ["diff", "following"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals: 1, maxReversals: 2 },
{ type: "label-stability", regions: "all" },
{ type: "flow", regions: ["diff", "following"] },
]),
)
})
function lines(count: number) {
return Array.from({ length: count }, (_, index) => `line ${index + 1}`).join("\n")
}
function source(count: number, changed: boolean) {
return Array.from(
{ length: count },
(_, index) => `export const value${index} = ${changed ? index + 1 : index}\n`,
).join("")
}
@@ -0,0 +1,157 @@
import { expect, test } from "@playwright/test"
import {
defineVisualRegions,
mapVisualRegions,
reportVisualStability,
startVisualProbe,
stopVisualProbe,
visualPlan,
} from "../../utils/visual-stability"
import {
assistantMessage,
completedAssistantInfo,
messageUpdated,
partDelta,
partUpdated,
reasoningPart,
setupTimeline,
shell,
status,
textPart,
userMessage,
waitForVisualSettle,
} from "./fixture"
test.describe("timeline visual lifecycle stability", () => {
test("streams empty, short, and long parallel shells to staggered completion", async ({ page }, testInfo) => {
test.setTimeout(180_000)
const ids = ["prt_parallel_01_empty", "prt_parallel_02_short", "prt_parallel_03_long"] as const
const initial = ids.map((id) => shell(id, "running"))
const followingID = "prt_parallel_04_following"
const assistant = assistantMessage([...initial, textPart(followingID, "Following all parallel shells.")], {
completed: false,
})
const timeline = await setupTimeline(page, {
messages: [userMessage(), assistant],
settings: { shellToolPartsExpanded: true, showReasoningSummaries: true },
cpuRate: 4,
eventRetry: 24,
seedHistory: true,
})
await timeline.send(status("busy"), 150)
for (const id of ids) await timeline.waitForPart(id)
const scroller = page.locator(".scroll-view__viewport", {
has: page.locator('[data-timeline-row="AssistantPart"]'),
})
await scroller.evaluate((element) => (element.scrollTop = element.scrollHeight))
const regions = defineVisualRegions({
prt_shell_empty: shellRegion(ids[0]),
prt_shell_short: shellRegion(ids[1]),
prt_shell_long: shellRegion(ids[2]),
following: shellRegion(followingID),
})
await waitForVisualSettle(page, [`[data-timeline-part-id="${followingID}"]`])
await startVisualProbe(page, regions)
await timeline.sendAll([
{ event: partUpdated(shell(ids[0]!, "completed", "")), delay: 180 },
{ event: partUpdated(shell(ids[2]!, "running", lines(10))), delay: 70 },
{ event: partUpdated(shell(ids[1]!, "running", lines(2))), delay: 110 },
{ event: partUpdated(shell(ids[2]!, "running", lines(25))), delay: 80 },
{ event: partUpdated(shell(ids[1]!, "completed", lines(2))), delay: 260 },
{ event: partUpdated(shell(ids[2]!, "running", lines(50))), delay: 100 },
{ event: partUpdated(shell(ids[2]!, "completed", lines(50))), delay: 450 },
{ event: messageUpdated(completedAssistantInfo(assistant.info)), delay: 100 },
{ event: status("idle"), delay: 700 },
])
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"parallel-shells",
trace,
visualPlan(
regions,
[
{ type: "required", regions: ["prt_shell_empty", "prt_shell_short", "prt_shell_long", "following"] },
{ type: "unique", regions: ["prt_shell_empty", "prt_shell_short", "prt_shell_long"] },
{ type: "stable", regions: ["prt_shell_empty", "prt_shell_short", "prt_shell_long", "following"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals: 0, maxReversals: 4 },
{ type: "label-stability", regions: "all" },
{ type: "preserve-bottom-anchor" },
{ type: "flow", regions: ["prt_shell_empty", "prt_shell_short", "prt_shell_long", "following"] },
],
{ perMarker: true },
),
)
await expect(page.locator(`[data-timeline-part-id="${ids[2]}"] [data-slot="bash-pre"]`)).toContainText("line 50")
const short = page.locator(`[data-timeline-part-id="${ids[1]}"]`)
await short.locator('[data-slot="collapsible-trigger"]').click()
await expect(short.locator('[data-slot="collapsible-trigger"]')).toHaveAttribute("aria-expanded", "false")
await timeline.send(partUpdated(textPart("prt_late_sibling", "A later sibling rerender.")), 250)
await expect(short.locator('[data-slot="collapsible-trigger"]')).toHaveAttribute("aria-expanded", "false")
})
test("replaces thinking with streamed reasoning and text without a blank visible turn", async ({
page,
}, testInfo) => {
const reasoningID = "prt_reasoning_visible"
const textID = "prt_streamed_text"
const assistant = assistantMessage([], { completed: false })
const timeline = await setupTimeline(page, {
messages: [userMessage(), assistant],
settings: { showReasoningSummaries: true },
cpuRate: 4,
})
await timeline.send(status("busy"), 120)
await expect(page.locator('[data-timeline-row="Thinking"]')).toBeVisible()
const regions = defineVisualRegions({
thinking: { selector: '[data-timeline-row="Thinking"]' },
reasoning: {
selector: `[data-timeline-part-id="${reasoningID}"]`,
closest: '[data-timeline-row="AssistantPart"]',
},
text: { selector: `[data-timeline-part-id="${textID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
})
await startVisualProbe(page, regions)
await timeline.send(partUpdated(reasoningPart(reasoningID, "")), 100)
await expect(page.locator(`[data-timeline-part-id="${reasoningID}"]`)).toHaveCount(0)
await timeline.send(partUpdated(reasoningPart(reasoningID, "## Planning\n\nChecking the visible timeline.")), 160)
await timeline.waitForPart(reasoningID)
await expect(page.locator('[data-timeline-row="Thinking"]')).toHaveCount(0)
await timeline.send(partUpdated(textPart(textID, "Starting")), 100)
await timeline.send(partDelta(textID, " **stable"), 90)
await timeline.send(partDelta(textID, " output** with `code` and [a link"), 130)
await timeline.send(partDelta(textID, "](https://example.com)."), 220)
await timeline.send(messageUpdated(completedAssistantInfo(assistant.info)), 120)
await timeline.send(status("idle"), 500)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"reasoning-text-handoff",
trace,
visualPlan(regions, [
{ type: "required", regions: ["reasoning", "text"] },
{ type: "continuous-any", regions: ["thinking", "reasoning", "text"] },
{ type: "unique", regions: ["reasoning", "text"] },
{ type: "stable", regions: ["reasoning", "text"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxReversals: 4 },
{ type: "label-stability", regions: "all" },
{ type: "flow", regions: ["reasoning", "text"] },
]),
)
await expect(page.locator(`[data-timeline-part-id="${textID}"]`)).toContainText("stable output")
})
})
function lines(count: number) {
return Array.from({ length: count }, (_, index) => `line ${index + 1}`).join("\n")
}
function shellRegion(id: string) {
return { selector: `[data-timeline-part-id="${id}"]`, closest: '[data-timeline-row="AssistantPart"]' }
}
@@ -0,0 +1,75 @@
import { expect, test } from "@playwright/test"
import {
analyzeVisualObservations,
defineVisualRegions,
startVisualProbe,
stopVisualProbe,
visualPlan,
} from "../../utils/visual-stability"
import { assistantMessage, setupTimeline, textPart, userMessage } from "./fixture"
test("detects blanking caused by ancestor opacity", async ({ page }) => {
const partID = "prt_oracle_ancestor_opacity"
await setupTimeline(page, { messages: [userMessage(), assistantMessage([textPart(partID, "Visible content")])] })
const row = page.locator(`[data-timeline-part-id="${partID}"]`).first()
const regions = defineVisualRegions({
content: { selector: `[data-timeline-part-id="${partID}"]` },
})
await startVisualProbe(page, regions)
await row.evaluate((element) => {
element.parentElement!.style.opacity = "0"
})
await page.waitForTimeout(50)
await row.evaluate((element) => {
element.parentElement!.style.opacity = "1"
})
await page.waitForTimeout(50)
const trace = await stopVisualProbe<keyof typeof regions>(page)
const issues = analyzeVisualObservations(
trace.samples,
visualPlan(regions, [
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all" },
{ type: "label-stability", regions: "all" },
]),
)
expect(issues.some((issue) => issue.includes("blanked between visible frames"))).toBe(true)
})
test("detects root opacity when probing descendant opacity", async ({ page }) => {
const partID = "prt_oracle_descendant_opacity"
await setupTimeline(page, { messages: [userMessage(), assistantMessage([textPart(partID, "Visible content")])] })
const row = page.locator(`[data-timeline-part-id="${partID}"]`).first()
await row.evaluate((element) => {
element.innerHTML = '<span data-probe-opacity="true">Visible content</span>'
})
const regions = defineVisualRegions({
content: {
selector: `[data-timeline-part-id="${partID}"]`,
opacitySelectors: ['[data-probe-opacity="true"]'],
},
})
await startVisualProbe(page, regions)
await row.evaluate((element) => {
;(element as HTMLElement).style.opacity = "0"
})
await page.waitForTimeout(50)
await row.evaluate((element) => {
;(element as HTMLElement).style.opacity = "1"
})
await page.waitForTimeout(50)
const trace = await stopVisualProbe<keyof typeof regions>(page)
const issues = analyzeVisualObservations(
trace.samples,
visualPlan(regions, [
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all" },
{ type: "label-stability", regions: "all" },
]),
)
expect(issues.some((issue) => issue.includes("blanked between visible frames"))).toBe(true)
})
@@ -0,0 +1,17 @@
import config from "../playwright.config"
export default {
...config,
testDir: ".",
testMatch: "**/*.spec.ts",
outputDir: "../../test-results/timeline-stability",
reporter: [["html", { outputFolder: "../../playwright-report/timeline-stability", open: "never" }], ["line"]],
retries: 0,
workers: 1,
use: {
...config.use,
trace: "retain-on-failure",
screenshot: "only-on-failure",
video: "retain-on-failure",
},
}
@@ -0,0 +1,353 @@
import { expect, test } from "@playwright/test"
import {
defineVisualRegions,
reportVisualStability,
startVisualProbe,
stopVisualProbe,
visualPlan,
} from "../../utils/visual-stability"
import {
assistantMessage,
partUpdated,
setupTimeline,
shell,
textPart,
userMessage,
type TimelineMessage,
} from "./fixture"
test("does not reverse visible rows when the user wheels during shell remeasurement", async ({ page }, testInfo) => {
const shellID = "prt_wheel_01_shell"
const followingID = "prt_wheel_02_following"
const timeline = await setupTimeline(page, {
messages: [
...history(12),
userMessage(),
assistantMessage([shell(shellID, "running"), textPart(followingID, "Following wheel interaction")], {
completed: false,
}),
],
settings: { shellToolPartsExpanded: true },
cpuRate: 4,
reducedMotion: true,
seedHistory: true,
})
const scroller = page.locator(".scroll-view__viewport", { has: page.locator("[data-timeline-row]") })
const regions = defineVisualRegions({
shell: { selector: `[data-timeline-part-id="${shellID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
following: { selector: `[data-timeline-part-id="${followingID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
})
await startVisualProbe(page, regions)
await timeline.send(partUpdated(shell(shellID, "running", lines(30))), 80)
await scroller.evaluate((element) =>
element.dispatchEvent(new WheelEvent("wheel", { bubbles: true, cancelable: true, deltaY: -180 })),
)
await scroller.evaluate((element) => (element.scrollTop -= 180))
await timeline.send(partUpdated(shell(shellID, "running", lines(50))), 250)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(testInfo, "wheel-during-resize", trace, rowPairPlan(regions, 1))
})
test("keeps moving upward while drag-selecting above the timeline", async ({ page }) => {
await setupTimeline(page, {
messages: history(80),
viewport: { width: 1400, height: 700 },
reducedMotion: true,
})
const scroller = page.locator(".scroll-view__viewport", { has: page.locator("[data-timeline-row]") })
const text = page.getByText("History 79.", { exact: false })
await expect(text).toBeVisible()
await scroller.evaluate((element) => {
element.dataset.selectionLength = "0"
document.addEventListener("selectionchange", () => {
element.dataset.selectionLength = String(
Math.max(Number(element.dataset.selectionLength), window.getSelection()?.toString().length ?? 0),
)
})
})
const textBox = await text.boundingBox()
const scrollBox = await scroller.boundingBox()
expect(textBox).not.toBeNull()
expect(scrollBox).not.toBeNull()
if (!textBox || !scrollBox) return
await page.mouse.move(textBox.x + textBox.width - 10, textBox.y + textBox.height / 2)
await page.mouse.down()
await page.mouse.move(textBox.x + 20, scrollBox.y - 120, { steps: 30 })
await expect.poll(() => scroller.evaluate((element) => Number(element.dataset.selectionLength))).toBeGreaterThan(0)
await expect
.poll(() => scroller.evaluate((element) => element.scrollHeight - element.clientHeight - element.scrollTop))
.toBeGreaterThan(500)
await page.mouse.up()
})
test("does not pull a keyboard-scrolled user during shell remeasurement", async ({ page }, testInfo) => {
const shellID = "prt_keyboard_01_shell"
const followingID = "prt_keyboard_02_following"
const timeline = await setupTimeline(page, {
messages: [
...history(12),
userMessage(),
assistantMessage([shell(shellID, "running"), textPart(followingID, "Following keyboard interaction")], {
completed: false,
}),
],
settings: { shellToolPartsExpanded: true },
cpuRate: 4,
})
const scroller = page.locator(".scroll-view__viewport", { has: page.locator("[data-timeline-row]") })
await scroller.focus()
for (let index = 0; index < 3; index++) {
await scroller.press("PageUp")
await page.waitForTimeout(250)
}
await expect
.poll(() => scroller.evaluate((element) => element.scrollHeight - element.clientHeight - element.scrollTop), {
timeout: 20_000,
})
.toBeGreaterThan(80)
await page.waitForFunction(() => {
const root = [...document.querySelectorAll<HTMLElement>(".scroll-view__viewport")].find((element) =>
element.querySelector("[data-timeline-row]"),
)
if (!root) return false
return new Promise<boolean>((resolve) => {
const top = root.scrollTop
requestAnimationFrame(() => requestAnimationFrame(() => resolve(Math.abs(root.scrollTop - top) <= 0.5)))
})
})
const anchor = await scroller.evaluate((element) => {
const view = element.getBoundingClientRect()
return [...element.querySelectorAll<HTMLElement>("[data-timeline-key]")].find((row) => {
const rect = row.getBoundingClientRect()
return rect.top >= view.top + 40 && rect.bottom <= view.bottom - 40
})?.dataset.timelineKey
})
expect(anchor).toBeTruthy()
const regions = defineVisualRegions({
anchor: { selector: `[data-timeline-key="${anchor}"]` },
})
await startVisualProbe(page, regions)
await timeline.send(partUpdated(shell(shellID, "running", lines(50))), 400)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(testInfo, "keyboard-during-resize", trace, anchorPlan(regions))
})
test("tracks keyboard scrolling from a focused timeline descendant", async ({ page }, testInfo) => {
const shellID = "prt_descendant_keyboard_01_shell"
const timeline = await setupTimeline(page, {
messages: [...history(12), userMessage(), assistantMessage([shell(shellID, "completed", lines(5))])],
settings: { shellToolPartsExpanded: false },
cpuRate: 4,
reducedMotion: true,
})
const scroller = page.locator(".scroll-view__viewport", { has: page.locator("[data-timeline-row]") })
const row = page.locator(`[data-timeline-part-id="${shellID}"]`).first()
const trigger = page.locator(`[data-timeline-part-id="${shellID}"] [data-slot="collapsible-trigger"]`)
await row.evaluate((element) => element.setAttribute("tabindex", "0"))
await row.focus()
for (let index = 0; index < 3; index++) {
await row.press("PageUp")
await page.waitForTimeout(250)
}
await expect
.poll(() => scroller.evaluate((element) => element.scrollHeight - element.clientHeight - element.scrollTop))
.toBeGreaterThan(5)
const anchor = await scroller.evaluate((element) => {
const view = element.getBoundingClientRect()
return [...element.querySelectorAll<HTMLElement>("[data-timeline-key]")].find((row) => {
const rect = row.getBoundingClientRect()
return rect.top >= view.top + 40 && rect.bottom <= view.bottom - 40
})?.dataset.timelineKey
})
expect(anchor).toBeTruthy()
const regions = defineVisualRegions({
anchor: { selector: `[data-timeline-key="${anchor}"]` },
})
await startVisualProbe(page, regions)
await trigger.click()
await page.waitForTimeout(300)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(testInfo, "descendant-keyboard-resize", trace, anchorPlan(regions))
})
test("does not claim keyboard scrolling owned by a nested scrollable", async ({ page }) => {
const shellID = "prt_nested_keyboard_shell"
await setupTimeline(page, {
messages: [userMessage(), assistantMessage([shell(shellID, "completed", lines(50))])],
settings: { shellToolPartsExpanded: true },
cpuRate: 4,
reducedMotion: true,
seedHistory: true,
})
const scroller = page.locator(".scroll-view__viewport", { has: page.locator("[data-timeline-row]") })
const nested = page.locator(`[data-timeline-part-id="${shellID}"] [data-scrollable]`)
await nested.evaluate((element) => (element.scrollTop = element.scrollHeight))
await nested.focus()
await page.waitForFunction(() => {
const root = [...document.querySelectorAll<HTMLElement>(".scroll-view__viewport")].find((element) =>
element.querySelector("[data-timeline-row]"),
)
if (!root) return false
return new Promise<boolean>((resolve) => {
const top = root.scrollTop
requestAnimationFrame(() => requestAnimationFrame(() => resolve(Math.abs(root.scrollTop - top) <= 0.5)))
})
})
const before = await scroller.evaluate((element) => element.scrollTop)
const nestedBefore = await nested.evaluate((element) => element.scrollTop)
await nested.press("PageUp")
await page.waitForTimeout(300)
expect(await scroller.evaluate((element) => element.scrollTop)).toBe(before)
expect(await nested.evaluate((element) => element.scrollTop)).toBeLessThan(nestedBefore)
await nested.evaluate((element) => (element.scrollTop = 0))
await scroller.evaluate((element) => (element.scrollTop = Math.min(300, element.scrollHeight - element.clientHeight)))
const boundaryBefore = await scroller.evaluate((element) => element.scrollTop)
expect(boundaryBefore).toBeGreaterThan(0)
await nested.press("PageUp")
await expect.poll(() => scroller.evaluate((element) => element.scrollTop)).toBeLessThan(boundaryBefore)
const nonOverflowing = page.locator(`[data-timeline-part-id="${shellID}"]`).first()
await nonOverflowing.evaluate((element) => {
element.setAttribute("data-scrollable", "")
element.setAttribute("tabindex", "0")
})
await nonOverflowing.focus()
const nonOverflowBefore = await scroller.evaluate((element) => element.scrollTop)
await nonOverflowing.press("PageUp")
await expect.poll(() => scroller.evaluate((element) => element.scrollTop)).toBeLessThan(nonOverflowBefore)
})
test("jump to latest lands on stable final rows after offscreen growth", async ({ page }, testInfo) => {
const shellID = "prt_jump_01_shell"
const followingID = "prt_jump_02_following"
const timeline = await setupTimeline(page, {
messages: [
...history(20),
userMessage(),
assistantMessage([shell(shellID, "running"), textPart(followingID, "Latest visible row")], { completed: false }),
],
settings: { shellToolPartsExpanded: true },
cpuRate: 4,
})
const scroller = page.locator(".scroll-view__viewport", { has: page.locator("[data-timeline-row]") })
await scroller.evaluate(
(element) => (element.scrollTop = Math.max(0, element.scrollHeight - element.clientHeight - 600)),
)
await timeline.send(partUpdated(shell(shellID, "running", lines(50))), 300)
const regions = defineVisualRegions({
shell: { selector: `[data-timeline-part-id="${shellID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
following: { selector: `[data-timeline-part-id="${followingID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
})
await startVisualProbe(page, regions)
await page.getByRole("button", { name: /Jump to latest/i }).click()
await expect(page.locator(`[data-timeline-part-id="${followingID}"]`)).toBeVisible()
await page.waitForTimeout(600)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"jump-latest",
trace,
visualPlan(regions, [
{ type: "required", regions: ["shell", "following"] },
{ type: "unique", regions: ["shell", "following"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals: 1 },
{ type: "label-stability", regions: "all" },
{ type: "acquire-bottom-anchor" },
{ type: "flow", regions: ["shell", "following"] },
]),
)
})
test("handles a single row taller than the viewport", async ({ page }, testInfo) => {
const shellID = "prt_tall_01_shell"
const followingID = "prt_tall_02_following"
const timeline = await setupTimeline(page, {
messages: [
userMessage(),
assistantMessage([shell(shellID, "running"), textPart(followingID, "After tall row")], { completed: false }),
],
settings: { shellToolPartsExpanded: true },
viewport: { width: 900, height: 360 },
cpuRate: 4,
seedHistory: true,
})
const regions = defineVisualRegions({
shell: { selector: `[data-timeline-part-id="${shellID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
following: { selector: `[data-timeline-part-id="${followingID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
})
await startVisualProbe(page, regions)
await timeline.send(partUpdated(shell(shellID, "completed", lines(100))), 700)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"taller-than-viewport",
trace,
visualPlan(regions, [
{ type: "required", regions: ["shell", "following"] },
{ type: "unique", regions: ["shell", "following"] },
{ type: "stable", regions: ["shell", "following"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals: 0 },
{ type: "label-stability", regions: "all" },
{ type: "preserve-bottom-anchor" },
{ type: "flow", regions: ["shell", "following"] },
]),
)
})
function history(count: number): TimelineMessage[] {
return Array.from({ length: count }, (_, index) => {
const prefix = `msg_${String(index).padStart(4, "0")}_scroll`
const userID = `${prefix}_a_user`
return [
userMessage(undefined, { id: userID, created: 1690000000000 + index * 10_000 }),
assistantMessage(
[textPart(`prt_${String(index).padStart(4, "0")}_scroll`, `History ${index}. ${"content ".repeat(30)}`)],
{
id: `${prefix}_b_assistant`,
parentID: userID,
created: 1690000001000 + index * 10_000,
},
),
]
}).flat()
}
function lines(count: number) {
return Array.from({ length: count }, (_, index) => `line ${index + 1}`).join("\n")
}
function rowPairPlan(
regions: Record<"shell" | "following", { selector: string; closest?: string }>,
maxPositionReversals: number,
) {
return visualPlan(regions, [
{ type: "required", regions: ["shell", "following"] },
{ type: "unique", regions: ["shell", "following"] },
{ type: "stable", regions: ["shell", "following"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals },
{ type: "label-stability", regions: "all" },
{ type: "flow", regions: ["shell", "following"] },
])
}
function anchorPlan(regions: Record<"anchor", { selector: string; closest?: string }>) {
return visualPlan(regions, [
{ type: "required", regions: ["anchor"] },
{ type: "unique", regions: ["anchor"] },
{ type: "stable", regions: ["anchor"] },
{ type: "fixed", regions: ["anchor"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals: 0 },
{ type: "label-stability", regions: "all" },
])
}
@@ -0,0 +1,255 @@
import { test } from "@playwright/test"
import {
defineVisualRegions,
reportVisualStability,
startVisualProbe,
stopVisualProbe,
visualPlan,
} from "../../utils/visual-stability"
import {
assistantMessage,
partUpdated,
setupTimeline,
shell,
textPart,
userMessage,
waitForVisualSettle,
} from "./fixture"
const profiles = [
{
name: "empty running to completed",
updates: [{ state: "completed" as const, output: "", delay: 350 }],
},
{
name: "50 lines arriving incrementally",
updates: [
{ state: "running" as const, output: lines(1), delay: 100 },
{ state: "running" as const, output: lines(10), delay: 160 },
{ state: "running" as const, output: lines(25), delay: 90 },
{ state: "running" as const, output: lines(50), delay: 220 },
{ state: "completed" as const, output: lines(50), delay: 500 },
],
},
{
name: "wide ANSI and CRLF output",
updates: [
{
state: "running" as const,
output: Array.from({ length: 20 }, (_, index) => `\u001b[32mline ${index}\u001b[0m ${"wide-".repeat(30)}`).join(
"\r\n",
),
delay: 240,
},
{
state: "completed" as const,
output: Array.from({ length: 20 }, (_, index) => `line ${index} ${"wide-".repeat(30)}`).join("\n"),
delay: 500,
},
],
},
] as const
for (const profile of profiles) {
test(`keeps rows stable for shell ${profile.name}`, async ({ page }, testInfo) => {
const shellID = `prt_matrix_${profiles.indexOf(profile)}_01_shell`
const followingID = `prt_matrix_${profiles.indexOf(profile)}_02_following`
const timeline = await setupTimeline(page, {
messages: [
userMessage(),
assistantMessage([shell(shellID, "running"), textPart(followingID, "Following shell row")], {
completed: false,
}),
],
settings: { shellToolPartsExpanded: true },
cpuRate: 4,
seedHistory: true,
})
const scroller = page.locator(".scroll-view__viewport", { has: page.locator("[data-timeline-row]") })
await scroller.evaluate((element) => (element.scrollTop = element.scrollHeight))
await waitForVisualSettle(page, [
`[data-timeline-part-id="${shellID}"]`,
`[data-timeline-part-id="${followingID}"]`,
])
const regions = defineVisualRegions({
shell: { selector: `[data-timeline-part-id="${shellID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
following: {
selector: `[data-timeline-part-id="${followingID}"]`,
closest: '[data-timeline-row="AssistantPart"]',
},
})
await startVisualProbe(page, regions)
for (const update of profile.updates) {
await timeline.send(partUpdated(shell(shellID, update.state, update.output)), update.delay)
}
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
`shell-${profiles.indexOf(profile)}`,
trace,
visualPlan(
regions,
[
{ type: "required", regions: ["shell", "following"] },
{ type: "unique", regions: ["shell", "following"] },
{ type: "stable", regions: ["shell", "following"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals: 0, maxReversals: 1 },
{ type: "label-stability", regions: "all" },
{ type: "preserve-bottom-anchor" },
{ type: "flow", regions: ["shell", "following"] },
],
{ perMarker: true },
),
)
})
}
test("keeps following row stable when a collapsed shell receives 50 lines", async ({ page }, testInfo) => {
const shellID = "prt_matrix_collapsed_01_shell"
const followingID = "prt_matrix_collapsed_02_following"
const timeline = await setupTimeline(page, {
messages: [
userMessage(),
assistantMessage([shell(shellID, "running"), textPart(followingID, "Following collapsed shell")], {
completed: false,
}),
],
settings: { shellToolPartsExpanded: false },
cpuRate: 4,
seedHistory: true,
})
await waitForVisualSettle(page, [`[data-timeline-part-id="${shellID}"]`, `[data-timeline-part-id="${followingID}"]`])
const regions = defineVisualRegions({
shell: { selector: `[data-timeline-part-id="${shellID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
following: { selector: `[data-timeline-part-id="${followingID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
})
await startVisualProbe(page, regions)
await timeline.send(partUpdated(shell(shellID, "running", lines(50))), 240)
await timeline.send(partUpdated(shell(shellID, "completed", lines(50))), 500)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"collapsed-shell",
trace,
visualPlan(
regions,
[
{ type: "required", regions: ["shell", "following"] },
{ type: "unique", regions: ["shell", "following"] },
{ type: "stable", regions: ["shell", "following"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: ["following"], maxPositionReversals: 0 },
{ type: "label-stability", regions: "all" },
{ type: "flow", regions: ["shell", "following"] },
],
{ perMarker: true },
),
)
})
test("keeps rows stable when a running shell becomes an error", async ({ page }, testInfo) => {
const shellID = "prt_matrix_error_01_shell"
const followingID = "prt_matrix_error_02_following"
const timeline = await setupTimeline(page, {
messages: [
userMessage(),
assistantMessage([shell(shellID, "running", lines(10)), textPart(followingID, "Following failed shell")], {
completed: false,
}),
],
settings: { shellToolPartsExpanded: true },
cpuRate: 4,
seedHistory: true,
})
await waitForVisualSettle(page, [`[data-timeline-part-id="${shellID}"]`, `[data-timeline-part-id="${followingID}"]`])
const regions = defineVisualRegions({
shell: { selector: `[data-timeline-part-id="${shellID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
following: { selector: `[data-timeline-part-id="${followingID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
})
await startVisualProbe(page, regions)
await timeline.send(
partUpdated({
...shell(shellID, "error"),
state: {
status: "error",
input: { command: `echo ${shellID}` },
error: "Command failed after output",
metadata: {},
time: { start: 1700000001000, end: 1700000002000 },
},
}),
500,
)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"shell-error",
trace,
visualPlan(
regions,
[
{ type: "required", regions: ["shell", "following"] },
{ type: "unique", regions: ["shell", "following"] },
{ type: "stable", regions: ["shell", "following"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: ["following"], maxPositionReversals: 0 },
{ type: "label-stability", regions: "all" },
{ type: "preserve-bottom-anchor" },
{ type: "flow", regions: ["shell", "following"] },
],
{ perMarker: true },
),
)
})
test("keeps rows stable when later text arrives before shell output", async ({ page }, testInfo) => {
const shellID = "prt_late_text_01_shell"
const followingID = "prt_late_text_02_following"
const timeline = await setupTimeline(page, {
messages: [userMessage(), assistantMessage([shell(shellID, "running")], { completed: false })],
settings: { shellToolPartsExpanded: true },
cpuRate: 4,
seedHistory: true,
})
await waitForVisualSettle(page, [`[data-timeline-part-id="${shellID}"]`])
const regions = defineVisualRegions({
shell: { selector: `[data-timeline-part-id="${shellID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
following: {
selector: `[data-timeline-part-id="${followingID}"]`,
closest: '[data-timeline-row="AssistantPart"]',
},
})
await startVisualProbe(page, regions)
await timeline.send(partUpdated(textPart(followingID, "Later assistant content arrived before shell output.")), 240)
await timeline.send(partUpdated(shell(shellID, "running", lines(20))), 300)
await timeline.send(partUpdated(shell(shellID, "completed", lines(20))), 600)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"late-text-before-shell-output",
trace,
visualPlan(
regions,
[
{ type: "required", regions: ["shell", "following"] },
{ type: "unique", regions: ["shell", "following"] },
{ type: "stable", regions: ["shell"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals: 0 },
{ type: "label-stability", regions: "all" },
{ type: "preserve-bottom-anchor" },
{ type: "flow", regions: ["shell", "following"] },
],
{ perMarker: true },
),
)
})
function lines(count: number) {
return Array.from({ length: count }, (_, index) => `line ${index + 1}`).join("\n")
}
@@ -0,0 +1,106 @@
import { expect, test } from "@playwright/test"
import {
defineVisualRegions,
reportVisualStability,
startVisualProbe,
stopVisualProbe,
visualPlan,
} from "../../utils/visual-stability"
import {
assistantMessage,
partUpdated,
session,
sessionID,
setupTimeline,
textPart,
toolPart,
userMessage,
} from "./fixture"
test("adds a task child-session link without replacing the task row", async ({ page }, testInfo) => {
const taskID = "prt_task_link"
const childID = "ses_task_child"
const input = { description: "Inspect child", subagent_type: "explore" }
const timeline = await setupTimeline(page, {
messages: [userMessage(), assistantMessage([toolPart(taskID, "task", "running", input)], { completed: false })],
sessions: [session(), session({ id: childID, parentID: sessionID, title: "Inspect child" })],
cpuRate: 4,
})
const regions = defineVisualRegions({
task: { selector: `[data-timeline-part-id="${taskID}"] [data-slot="collapsible-trigger"]` },
})
await startVisualProbe(page, regions)
await timeline.send(
partUpdated(toolPart(taskID, "task", "completed", input, { metadata: { sessionId: childID } })),
500,
)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"task-link",
trace,
visualPlan(regions, [
{ type: "required", regions: ["task"] },
{ type: "unique", regions: ["task"] },
{ type: "stable", regions: ["task"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals: 0 },
{ type: "label-stability", regions: "all" },
]),
)
await expect(
page.locator(`a[href$="/session/${childID}"]`, { has: page.locator('[data-component="task-tool-card"]') }),
).toBeVisible()
})
test("changes generic tool arguments without replacing the row", async ({ page }, testInfo) => {
const toolID = "prt_generic_mutation"
const followingID = "prt_generic_mutation_following"
const timeline = await setupTimeline(page, {
messages: [
userMessage(),
assistantMessage(
[
toolPart(toolID, "mcp_probe", "running", { target: "one", count: 1 }),
textPart(followingID, "Following generic tool"),
],
{ completed: false },
),
],
cpuRate: 4,
})
const regions = defineVisualRegions({
tool: { selector: `[data-timeline-part-id="${toolID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
following: { selector: `[data-timeline-part-id="${followingID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
})
await startVisualProbe(page, regions)
await timeline.send(
partUpdated(toolPart(toolID, "mcp_probe", "running", { target: "two", count: 2, mode: "deep" })),
200,
)
await timeline.send(
partUpdated(toolPart(toolID, "mcp_probe", "completed", { target: "two", count: 2, mode: "deep" })),
400,
)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"generic-mutation",
trace,
visualPlan(
regions,
[
{ type: "required", regions: ["tool", "following"] },
{ type: "unique", regions: ["tool", "following"] },
{ type: "stable", regions: ["tool", "following"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals: 0 },
{ type: "label-stability", regions: "all" },
{ type: "flow", regions: ["tool", "following"] },
],
{ perMarker: true },
),
)
})
@@ -0,0 +1,198 @@
import { expect, test } from "@playwright/test"
import {
defineVisualRegions,
reportVisualStability,
startVisualProbe,
stopVisualProbe,
visualPlan,
} from "../../utils/visual-stability"
import {
assistantMessage,
directory,
partUpdated,
session,
sessionID,
setupTimeline,
status,
textPart,
toolPart,
userMessage,
} from "./fixture"
test.describe("timeline tool state stability", () => {
test("moves lightweight tools through pending, running, and completed without replacing rows", async ({
page,
}, testInfo) => {
const ids = ["webfetch", "websearch", "task", "skill", "custom"] as const
const inputs = {
webfetch: { url: "https://example.com/docs" },
websearch: { query: "timeline stability" },
task: { description: "Inspect timeline", subagent_type: "explore" },
skill: { name: "stability" },
custom: { target: "timeline", depth: 2 },
}
const names = { webfetch: "webfetch", websearch: "websearch", task: "task", skill: "skill", custom: "mcp_probe" }
const questionID = "prt_state_question"
const todoID = "prt_state_todo"
const initial = [
...ids.map((id) => toolPart(`prt_state_${id}`, names[id], "pending", inputs[id])),
toolPart(questionID, "question", "pending", questionInput()),
toolPart(todoID, "todowrite", "pending", { todos: [{ content: "Hidden", status: "pending" }] }),
textPart("prt_state_following", "Following lightweight tools"),
]
const childID = "ses_timeline_child"
const timeline = await setupTimeline(page, {
messages: [userMessage(), assistantMessage(initial, { completed: false })],
sessions: [session(), session({ id: childID, parentID: sessionID, title: "Inspect timeline" })],
cpuRate: 4,
})
await timeline.send(status("busy"), 120)
for (const id of ids) await timeline.waitForPart(`prt_state_${id}`)
await expect(page.locator(`[data-timeline-part-id="${questionID}"]`)).toHaveCount(0)
await expect(page.locator(`[data-timeline-part-id="${todoID}"]`)).toHaveCount(0)
const regionIDs = [
"prt_state_webfetch",
"prt_state_websearch",
"prt_state_task",
"prt_state_skill",
"prt_state_custom",
] as const
const regions = defineVisualRegions({
prt_state_webfetch: toolRegion(regionIDs[0]),
prt_state_websearch: toolRegion(regionIDs[1]),
prt_state_task: toolRegion(regionIDs[2]),
prt_state_skill: toolRegion(regionIDs[3]),
prt_state_custom: toolRegion(regionIDs[4]),
})
await startVisualProbe(page, regions)
for (const [index, id] of ids.entries()) {
await timeline.send(
partUpdated(toolPart(`prt_state_${id}`, names[id], "running", inputs[id])),
[80, 240, 100, 360, 140][index],
)
}
for (const [index, id] of ["skill", "webfetch", "custom", "task", "websearch"].entries()) {
const key = id as (typeof ids)[number]
const metadata = key === "task" ? { sessionId: childID } : key === "websearch" ? { provider: "exa" } : {}
const output = key === "websearch" ? "Result https://example.com/result" : "Completed"
await timeline.send(
partUpdated(toolPart(`prt_state_${key}`, names[key], "completed", inputs[key], { metadata, output })),
[110, 70, 280, 130, 420][index],
)
}
await timeline.send(
partUpdated(
toolPart(questionID, "question", "completed", questionInput(), { metadata: { answers: [["Keep it stable"]] } }),
),
350,
)
await timeline.waitForPart(questionID)
await timeline.send(status("idle"), 500)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"lightweight-tools",
trace,
visualPlan(regions, [
{ type: "required", regions: regionIDs },
{ type: "unique", regions: regionIDs },
{ type: "stable", regions: regionIDs },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxReversals: 4 },
{ type: "label-stability", regions: "all" },
]),
)
await expect(page.locator(`[data-timeline-part-id="${questionID}"]`)).toContainText("Keep it stable")
await expect(page.locator(`[data-timeline-part-id="${todoID}"]`)).toHaveCount(0)
await expect(
page.locator(`a[href$="/session/${childID}"]`, { has: page.locator('[data-component="task-tool-card"]') }),
).toBeVisible()
await expect(page.getByRole("button", { name: /Exa Web Search/ })).toBeVisible()
})
test("keeps an expanded mixed context group stable through staggered completion and error", async ({
page,
}, testInfo) => {
const ids = ["prt_ctx_01_read", "prt_ctx_02_glob", "prt_ctx_03_grep", "prt_ctx_04_list"]
const tools = ["read", "glob", "grep", "list"]
const inputs = [
{ filePath: "src/a.ts", offset: 0, limit: 120 },
{ path: directory, pattern: "**/*.ts" },
{ path: directory, pattern: "stability", include: "*.ts" },
{ path: "src" },
]
const context = ids.map((id, index) => toolPart(id, tools[index]!, "pending", inputs[index]!))
const timeline = await setupTimeline(page, {
messages: [
userMessage(),
assistantMessage([...context, textPart("prt_ctx_following", "Following context")], { completed: false }),
],
cpuRate: 4,
})
await timeline.send(status("busy"), 100)
const groupSelector = `[data-timeline-part-ids="${ids.join(",")}"]`
const group = page.locator(groupSelector)
await expect(group).toBeVisible()
await group.locator('[data-slot="collapsible-trigger"]').click()
await expect(group.locator('[data-slot="collapsible-trigger"]')).toHaveAttribute("aria-expanded", "true")
const regions = defineVisualRegions({
status: {
selector: `${groupSelector} [data-component="tool-status-title"]`,
opacitySelectors: ['[data-slot="tool-status-active"]', '[data-slot="tool-status-done"]'],
},
context: { selector: groupSelector, closest: '[data-timeline-row="AssistantPart"]' },
following: {
selector: '[data-timeline-part-id="prt_ctx_following"]',
closest: '[data-timeline-row="AssistantPart"]',
},
})
await startVisualProbe(page, regions)
for (const [index, delay] of [90, 260, 70, 380].entries()) {
await timeline.send(partUpdated(toolPart(ids[index]!, tools[index]!, "running", inputs[index]!)), delay)
}
await timeline.send(partUpdated(toolPart(ids[1]!, tools[1]!, "completed", inputs[1]!)), 130)
await timeline.send(partUpdated(toolPart(ids[3]!, tools[3]!, "completed", inputs[3]!)), 210)
await timeline.send(
partUpdated(toolPart(ids[0]!, tools[0]!, "error", inputs[0]!, { error: "Read interrupted" })),
110,
)
await timeline.send(partUpdated(toolPart(ids[2]!, tools[2]!, "completed", inputs[2]!)), 250)
await expect(group.locator('[data-component="tool-status-title"]')).toHaveAttribute("aria-label", "Explored")
await timeline.send(status("idle"), 700)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"mixed-context",
trace,
visualPlan(regions, [
{ type: "required", regions: ["context", "following"] },
{ type: "unique", regions: ["context"] },
{ type: "stable", regions: ["context"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxReversals: 4 },
{ type: "label-stability", regions: "all" },
{ type: "flow", regions: ["context", "following"] },
]),
)
await expect(group.locator('[data-component="tool-status-title"]')).toHaveAttribute("aria-label", "Explored")
await expect(group.locator('[data-slot="collapsible-trigger"]')).toHaveAttribute("aria-expanded", "true")
await group.locator('[data-slot="collapsible-trigger"]').click()
await expect(group.locator('[data-slot="collapsible-trigger"]')).toHaveAttribute("aria-expanded", "false")
await timeline.send(partUpdated(textPart("prt_ctx_late_sibling", "Later sibling content")), 200)
await expect(group.locator('[data-slot="collapsible-trigger"]')).toHaveAttribute("aria-expanded", "false")
await group.locator('[data-slot="collapsible-trigger"]').click()
await expect(group.locator('[data-slot="collapsible-trigger"]')).toHaveAttribute("aria-expanded", "true")
})
})
function questionInput() {
return { questions: [{ header: "Stability", question: "Keep it stable?", options: [] }] }
}
function toolRegion(id: string) {
return { selector: `[data-timeline-part-id="${id}"]`, closest: '[data-timeline-row="AssistantPart"]' }
}
@@ -0,0 +1,272 @@
import { expect, test } from "@playwright/test"
import {
defineVisualRegions,
reportVisualStability,
startVisualProbe,
stopVisualProbe,
visualPlan,
} from "../../utils/visual-stability"
import {
assistantID,
assistantMessage,
completedAssistantInfo,
event,
messageUpdated,
partDelta,
partUpdated,
setupTimeline,
shell,
status,
textPart,
toolPart,
userMessage,
} from "./fixture"
test("keeps unchanged siblings stable while a middle part is inserted and removed", async ({ page }, testInfo) => {
const firstID = "prt_mutation_01_first"
const middleID = "prt_mutation_02_middle"
const lastID = "prt_mutation_03_last"
const timeline = await setupTimeline(page, {
messages: [
userMessage(),
assistantMessage([textPart(firstID, "First stable row"), textPart(lastID, "Last stable row")], {
completed: false,
}),
],
cpuRate: 4,
})
const regions = defineVisualRegions({
first: { selector: `[data-timeline-part-id="${firstID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
last: { selector: `[data-timeline-part-id="${lastID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
})
await startVisualProbe(page, regions)
await timeline.send(partUpdated(textPart(middleID, "Inserted middle row. ".repeat(12))), 350)
await expect(page.locator(`[data-timeline-part-id="${middleID}"]`)).toBeVisible()
await timeline.send(
event("message.part.removed", { sessionID: "ses_timeline_stability", messageID: assistantID, partID: middleID }),
500,
)
await expect(page.locator(`[data-timeline-part-id="${middleID}"]`)).toHaveCount(0)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(testInfo, "middle-insert-remove", trace, stablePairPlan(regions, 1))
})
test("streams text through growth, canonical replacement, and completion", async ({ page }, testInfo) => {
const textID = "prt_text_reconcile"
const followingID = "prt_text_reconcile_following"
const assistant = assistantMessage([textPart(textID, "Starting"), textPart(followingID, "Following text row")], {
completed: false,
})
const timeline = await setupTimeline(page, { messages: [userMessage(), assistant], cpuRate: 4 })
const regions = defineVisualRegions({
text: { selector: `[data-timeline-part-id="${textID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
following: { selector: `[data-timeline-part-id="${followingID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
})
await startVisualProbe(page, regions)
await timeline.send(partDelta(textID, " streamed content"), 100)
await timeline.send(partDelta(textID, "\n\n- item one\n- item two\n- item three"), 180)
await timeline.send(partUpdated(textPart(textID, "Canonical replacement with a shorter final paragraph.")), 200)
await timeline.send(messageUpdated(completedAssistantInfo(assistant.info)), 500)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"text-reconcile",
trace,
visualPlan(regions, [
{ type: "required", regions: ["text", "following"] },
{ type: "unique", regions: ["text", "following"] },
{ type: "stable", regions: ["text", "following"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals: 1, maxReversals: 2 },
{ type: "label-stability", regions: "all" },
{ type: "preserve-bottom-anchor" },
{ type: "flow", regions: ["text", "following"] },
]),
)
})
test("inserts a completed question between stable rows", async ({ page }, testInfo) => {
const firstID = "prt_question_01_first"
const questionID = "prt_question_02_hidden"
const lastID = "prt_question_03_last"
const input = { questions: [{ header: "Choice", question: "Keep stable?", options: [] }] }
const timeline = await setupTimeline(page, {
messages: [
userMessage(),
assistantMessage(
[
textPart(firstID, "Before question"),
toolPart(questionID, "question", "running", input),
textPart(lastID, "After question"),
],
{ completed: false },
),
],
cpuRate: 4,
})
await expect(page.locator(`[data-timeline-part-id="${questionID}"]`)).toHaveCount(0)
const regions = defineVisualRegions({
first: { selector: `[data-timeline-part-id="${firstID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
last: { selector: `[data-timeline-part-id="${lastID}"]`, closest: '[data-timeline-row="AssistantPart"]' },
})
await startVisualProbe(page, regions)
await timeline.send(
partUpdated(toolPart(questionID, "question", "completed", input, { metadata: { answers: [["Yes"]] } })),
600,
)
await expect(page.locator(`[data-timeline-part-id="${questionID}"]`)).toBeVisible()
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(testInfo, "question-insert", trace, stablePairPlan(regions, 0))
})
test("replaces thinking with an assistant error without a blank turn", async ({ page }, testInfo) => {
const assistant = assistantMessage([], { completed: false })
const timeline = await setupTimeline(page, { messages: [userMessage(), assistant], cpuRate: 4 })
await timeline.send(status("busy"), 150)
await expect(page.locator('[data-timeline-row="Thinking"]')).toBeVisible()
const regions = defineVisualRegions({
thinking: { selector: '[data-timeline-row="Thinking"]' },
error: { selector: '[data-timeline-row="Error"]' },
})
await startVisualProbe(page, regions)
await timeline.send(
messageUpdated({
...assistant.info,
error: { name: "APIError", data: { message: "Provider failed visibly", isRetryable: false } },
}),
500,
)
await expect(page.locator('[data-timeline-row="Thinking"]')).toHaveCount(0)
await expect(page.locator('[data-timeline-row="Error"]')).toContainText("Provider failed visibly")
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"thinking-error",
trace,
visualPlan(regions, [
{ type: "required", regions: ["thinking", "error"] },
{ type: "continuous-any", regions: ["thinking", "error"] },
{ type: "unique", regions: ["thinking", "error"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all" },
{ type: "label-stability", regions: "all" },
]),
)
})
test("updates retry attempts and long provider messages without remounting the retry row", async ({
page,
}, testInfo) => {
const timeline = await setupTimeline(page, {
messages: [userMessage(), assistantMessage([], { completed: false })],
cpuRate: 4,
})
await timeline.send(status("retry", 1), 120)
await expect(page.locator('[data-timeline-row="Retry"]')).toBeVisible()
const regions = defineVisualRegions({
retry: { selector: '[data-timeline-row="Retry"]' },
})
await startVisualProbe(page, regions)
await timeline.send(
event("session.status", {
sessionID: "ses_timeline_stability",
status: {
type: "retry",
attempt: 2,
message: "A very long provider retry message ".repeat(8),
next: Date.now() + 10_000,
},
}),
300,
)
await timeline.send(status("retry", 3), 300)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"retry-evolution",
trace,
visualPlan(
regions,
[
{ type: "required", regions: ["retry"] },
{ type: "unique", regions: ["retry"] },
{ type: "stable", regions: ["retry"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals: 0 },
{ type: "label-stability", regions: "all" },
],
{ perMarker: true },
),
)
})
test("reducer-hardening: removes a historical turn one message at a time without moving a visible lower anchor twice", async ({
page,
}, testInfo) => {
const removeUserID = "msg_0500_remove_user"
const removeAssistantID = "msg_0501_remove_assistant"
const anchorUserID = "msg_2000_anchor_user"
const timeline = await setupTimeline(page, {
messages: [
userMessage(undefined, { id: removeUserID, created: 1690000000000 }),
assistantMessage([textPart("prt_remove_text", "Removed historical content. ".repeat(15))], {
id: removeAssistantID,
parentID: removeUserID,
created: 1690000001000,
}),
userMessage(undefined, { id: anchorUserID, created: 1700000000000 }),
assistantMessage([textPart("prt_anchor_text", "Visible anchor response")], {
id: "msg_2001_anchor_assistant",
parentID: anchorUserID,
created: 1700000001000,
}),
],
cpuRate: 4,
})
const regions = defineVisualRegions({
anchor: { selector: `[data-timeline-row="UserMessage"][data-message-id="${anchorUserID}"]` },
})
await startVisualProbe(page, regions)
await timeline.send(
event("message.removed", { sessionID: "ses_timeline_stability", messageID: removeAssistantID }),
200,
)
await timeline.send(event("message.removed", { sessionID: "ses_timeline_stability", messageID: removeUserID }), 500)
const trace = await stopVisualProbe<keyof typeof regions>(page)
await reportVisualStability(
testInfo,
"historical-turn-remove",
trace,
visualPlan(
regions,
[
{ type: "required", regions: ["anchor"] },
{ type: "unique", regions: ["anchor"] },
{ type: "stable", regions: ["anchor"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals: 0 },
{ type: "label-stability", regions: "all" },
],
{ perMarker: true },
),
)
})
function stablePairPlan(
regions: Record<"first" | "last", { selector: string; closest?: string }>,
maxPositionReversals: number,
) {
return visualPlan(regions, [
{ type: "required", regions: ["first", "last"] },
{ type: "unique", regions: ["first", "last"] },
{ type: "stable", regions: ["first", "last"] },
{ type: "opacity", regions: "all" },
{ type: "continuity", regions: "all" },
{ type: "motion", regions: "all", maxPositionReversals },
{ type: "label-stability", regions: "all" },
])
}
@@ -0,0 +1,312 @@
import type { Page } from "@playwright/test"
import { benchmark, expect } from "../benchmark"
import { setupTimelineBenchmark } from "./session-timeline-benchmark.fixture"
const changedLinesPerFile = 100
const linesPerSide = changedLinesPerFile / 2
const fileCounts = [1, 10, 100, 1_000, 10_000]
const filesPerDirectory = 100
const readyFrames = 3
const completionTimeoutMs = Number(process.env.REVIEW_PANE_COMPLETION_TIMEOUT_MS ?? 900_000)
type ReviewPaneScalingSample = {
observedAtMs: number
logicalRows: number
treeRows: number
fileRows: number
diffLines: number
header: string
ready: boolean
}
type ReviewPaneScalingProbe = {
startedAt?: number
firstTreeRowMs?: number
logicalTreeReadyMs?: number
firstDiffRenderMs?: number
stableReadyMs?: number
samples: ReviewPaneScalingSample[]
frameTimesMs: number[]
longTasks: { startTime: number; duration: number }[]
stop: () => void
}
benchmark.describe("performance: review pane scaling", () => {
for (const fileCount of fileCounts) {
const changedLines = fileCount * changedLinesPerFile
benchmark(
`${changedLines} changed lines across ${fileCount} ${fileCount === 1 ? "file" : "files"}`,
async ({ page, report }) => {
benchmark.setTimeout(1_200_000)
await page.emulateMedia({ reducedMotion: "reduce" })
const patchByteLimit = Number(process.env.REVIEW_PANE_PATCH_BYTE_LIMIT ?? Number.POSITIVE_INFINITY)
if (Number.isNaN(patchByteLimit) || patchByteLimit < 0)
throw new Error(`Invalid REVIEW_PANE_PATCH_BYTE_LIMIT: ${process.env.REVIEW_PANE_PATCH_BYTE_LIMIT}`)
const responseBody = JSON.stringify(createScalingDiffs(fileCount, patchByteLimit))
await setupTimelineBenchmark(page, {
historyTurns: 0,
eventBatch: 1,
newLayoutDesigns: true,
})
await page.route("**/vcs/diff**", (route) =>
route.fulfill({
status: 200,
contentType: "application/json",
headers: { "access-control-allow-origin": "*" },
body: responseBody,
}),
)
const expectedRows = fileCount + 2 + Math.ceil(fileCount / filesPerDirectory)
const metrics = await measureReviewPaneLoad(page, {
expectedFile: reviewFile(0),
expectedRows,
})
const search = await measureBroadReviewSearch(page, fileCount)
expect(metrics.logicalRows).toBe(expectedRows)
expect(metrics.fileRows).toBeGreaterThan(0)
expect(metrics.treeRows).toBeGreaterThan(0)
expect(metrics.diffLines).toBeGreaterThan(0)
expect(search.logicalRows).toBe(fileCount)
expect(search.renderedRows).toBeGreaterThan(0)
report(
{ ...metrics, search },
{
fileCount,
changedLinesPerFile,
changedLines,
additions: changedLines / 2,
deletions: changedLines / 2,
patchLines: changedLines,
patchByteLimit: Number.isFinite(patchByteLimit) ? patchByteLimit : null,
payloadBytes: new TextEncoder().encode(responseBody).byteLength,
expectedRows,
},
)
},
)
}
})
async function measureBroadReviewSearch(page: Page, expectedRows: number) {
const filter = page.getByRole("searchbox", { name: "Filter files" })
await filter.evaluate((element) => {
element.addEventListener(
"input",
() => {
;(window as Window & { __reviewSearchStartedAt?: number }).__reviewSearchStartedAt = performance.now()
},
{ once: true, capture: true },
)
})
await filter.fill("file-")
return page.evaluate((expectedRows) => {
const startedAt = (window as Window & { __reviewSearchStartedAt?: number }).__reviewSearchStartedAt!
return new Promise<{ stableMs: number; logicalRows: number; renderedRows: number }>((resolve) => {
let previous = -1
let streak = 0
const sample = () => {
const tree = document.querySelector<HTMLElement>('#review-panel [data-component="file-tree-v2"]')
const rows = [...document.querySelectorAll<HTMLElement>('#review-panel [data-slot="file-tree-v2-row"]')]
const logicalRows = Number(tree?.dataset.totalRows ?? rows.length)
const ready =
logicalRows === expectedRows && rows.length > 0 && rows.every((row) => row.textContent?.includes("file-"))
streak = ready && rows.length === previous ? streak + 1 : ready ? 1 : 0
previous = rows.length
if (streak >= 3) {
resolve({ stableMs: performance.now() - startedAt, logicalRows, renderedRows: rows.length })
return
}
requestAnimationFrame(sample)
}
requestAnimationFrame(sample)
})
}, expectedRows)
}
function createScalingDiffs(fileCount: number, patchByteLimit: number) {
const changes = Array.from({ length: linesPerSide }, (_, index) => {
const line = String(index).padStart(3, "0")
return `-export const value_${line} = "before"\n+export const value_${line} = "after"`
}).join("\n")
let patchBytes = 0
let capped = false
return Array.from({ length: fileCount }, (_, index) => {
const file = reviewFile(index)
const fullPatch = [
`diff --git a/${file} b/${file}`,
`--- a/${file}`,
`+++ b/${file}`,
`@@ -1,${linesPerSide} +1,${linesPerSide} @@`,
changes,
].join("\n")
if (index === 0 && fullPatch.length > patchByteLimit)
throw new Error(`REVIEW_PANE_PATCH_BYTE_LIMIT must include the active patch (${fullPatch.length} bytes)`)
const patch = !capped && patchBytes + fullPatch.length <= patchByteLimit ? fullPatch : emptyReviewPatch(file)
if (patch === fullPatch) patchBytes += fullPatch.length
else capped = true
return {
file,
patch,
additions: linesPerSide,
deletions: linesPerSide,
status: "modified" as const,
}
})
}
function emptyReviewPatch(file: string) {
return [`diff --git a/${file} b/${file}`, `--- a/${file}`, `+++ b/${file}`].join("\n")
}
function reviewFile(index: number) {
return `src/review/d${String(Math.floor(index / filesPerDirectory)).padStart(5, "0")}/file-${String(index).padStart(5, "0")}.ts`
}
async function measureReviewPaneLoad(page: Page, input: { expectedFile: string; expectedRows: number }) {
const toggle = page.getByRole("button", { name: "Toggle review" })
await expect(toggle).toBeVisible()
await toggle.evaluate((element) => element.setAttribute("data-review-pane-scaling-toggle", ""))
await installReviewPaneScalingProbe(page, input)
await toggle.click()
await page.waitForFunction(
() =>
(window as Window & { __reviewPaneScalingProbe?: ReviewPaneScalingProbe }).__reviewPaneScalingProbe
?.stableReadyMs !== undefined,
undefined,
{ timeout: completionTimeoutMs },
)
return page.evaluate(() => {
const probe = (window as Window & { __reviewPaneScalingProbe?: ReviewPaneScalingProbe }).__reviewPaneScalingProbe!
probe.stop()
const startedAt = probe.startedAt!
const final = probe.samples.at(-1)!
const resources = performance
.getEntriesByType("resource")
.filter((entry) => entry.name.includes("/vcs/diff")) as PerformanceResourceTiming[]
const resource = resources.at(-1)
const longTasks = probe.longTasks.filter(
(entry) => entry.startTime >= startedAt && entry.startTime <= startedAt + probe.stableReadyMs!,
)
const frameGaps = probe.frameTimesMs.map((time, index) => time - (probe.frameTimesMs[index - 1] ?? 0))
return {
firstTreeRowMs: probe.firstTreeRowMs ?? null,
logicalTreeReadyMs: probe.logicalTreeReadyMs ?? null,
firstDiffRenderMs: probe.firstDiffRenderMs ?? null,
stableReadyMs: probe.stableReadyMs ?? null,
responseStartMs: resource ? resource.responseStart - startedAt : null,
responseEndMs: resource ? resource.responseEnd - startedAt : null,
responseToStableMs: resource ? probe.stableReadyMs! - (resource.responseEnd - startedAt) : null,
treeRows: final.treeRows,
logicalRows: final.logicalRows,
fileRows: final.fileRows,
diffLines: final.diffLines,
samples: probe.samples.length,
maxFrameGapMs: Math.max(0, ...frameGaps),
longTaskCount: longTasks.length,
longTaskTotalMs: longTasks.reduce((sum, entry) => sum + entry.duration, 0),
maxLongTaskMs: Math.max(0, ...longTasks.map((entry) => entry.duration)),
}
})
}
async function installReviewPaneScalingProbe(page: Page, input: { expectedFile: string; expectedRows: number }) {
await page.evaluate(
({ expectedFile, expectedRows, stableFrames }) => {
let running = true
let readyStreak = 0
const basename = expectedFile.split("/").at(-1)!
const longTaskObserver = PerformanceObserver.supportedEntryTypes.includes("longtask")
? new PerformanceObserver((list) => {
probe.longTasks.push(
...list.getEntries().map((entry) => ({ startTime: entry.startTime, duration: entry.duration })),
)
})
: undefined
const probe: ReviewPaneScalingProbe = {
samples: [],
frameTimesMs: [],
longTasks: [],
stop: () => {
running = false
longTaskObserver?.disconnect()
},
}
const sample = (time: number) => {
if (!running || probe.startedAt === undefined) return
const panel = document.querySelector<HTMLElement>("#review-panel")
const tree = panel?.querySelector<HTMLElement>('[data-component="file-tree-v2"]')
const rows = panel?.querySelectorAll('[data-slot="file-tree-v2-row"]') ?? []
const fileRows = panel?.querySelectorAll('button[data-slot="file-tree-v2-row"]') ?? []
const header =
panel?.querySelector<HTMLElement>('[data-slot="session-review-v2-file-header"]')?.textContent?.trim() ?? ""
const viewers = panel
? [...panel.querySelectorAll<HTMLElement>('[data-component="file"][data-mode="diff"]')]
: []
const diffLines = viewers.reduce(
(sum, viewer) =>
sum + (viewer.querySelector("diffs-container")?.shadowRoot?.querySelectorAll("[data-line]").length ?? 0),
0,
)
const observedAtMs = time - probe.startedAt
const logicalRows = Number(tree?.dataset.totalRows ?? rows.length)
const ready =
logicalRows === expectedRows &&
fileRows.length > 0 &&
header.includes(basename) &&
viewers.length === 1 &&
diffLines > 0
const previous = probe.samples.at(-1)
const stable =
ready &&
previous?.ready === true &&
previous.logicalRows === logicalRows &&
previous.treeRows === rows.length &&
previous.fileRows === fileRows.length &&
previous.diffLines === diffLines &&
previous.header === header
probe.frameTimesMs.push(observedAtMs)
probe.samples.push({
observedAtMs,
logicalRows,
treeRows: rows.length,
fileRows: fileRows.length,
diffLines,
header,
ready,
})
if (probe.firstTreeRowMs === undefined && rows.length > 0) probe.firstTreeRowMs = observedAtMs
if (probe.logicalTreeReadyMs === undefined && logicalRows === expectedRows)
probe.logicalTreeReadyMs = observedAtMs
if (probe.firstDiffRenderMs === undefined && diffLines > 0) probe.firstDiffRenderMs = observedAtMs
readyStreak = !ready ? 0 : stable ? readyStreak + 1 : 1
if (readyStreak === stableFrames) probe.stableReadyMs = observedAtMs
if (probe.stableReadyMs === undefined) requestAnimationFrame(sample)
}
longTaskObserver?.observe({ type: "longtask", buffered: true })
document.addEventListener(
"click",
(event) => {
const toggle = event.target instanceof Element ? event.target.closest("button") : undefined
if (!toggle?.hasAttribute("data-review-pane-scaling-toggle")) return
probe.startedAt = performance.now()
performance.mark("opencode.review-pane-scaling.click")
requestAnimationFrame(sample)
},
{ capture: true, once: true },
)
;(window as Window & { __reviewPaneScalingProbe?: ReviewPaneScalingProbe }).__reviewPaneScalingProbe = probe
},
{ ...input, stableFrames: readyFrames },
)
}
@@ -0,0 +1,151 @@
import type { Page } from "@playwright/test"
import { expectSessionTitle } from "../../utils/waits"
import { mockOpenCodeServer } from "../../utils/mock-server"
import { benchmark, expect, withBenchmarkPage } from "../benchmark"
import { fixture } from "./session-timeline-stress.fixture"
import { installStressSessionTabs, stressSessionHref } from "./timeline-test-helpers"
import { measureSessionSwitch, waitForStableTimeline } from "./session-tab-switch-probe"
type ParentHydrationBenchmarkMode = "natural" | "candidate"
const mode = process.env.SESSION_PARENT_HYDRATION_BENCHMARK_MODE ?? "natural"
if (mode !== "natural" && mode !== "candidate") throw new Error(`Unknown parent hydration benchmark mode: ${mode}`)
const userID = "msg_parent_hydration_user"
const user = {
...fixture.messages[fixture.targetID][0]!,
info: { ...fixture.messages[fixture.targetID][0]!.info, id: userID, time: { created: 1700001000000 } },
parts: fixture.messages[fixture.targetID][0]!.parts.map((part, index) => ({
...part,
id: `prt_parent_hydration_user_${index}`,
messageID: userID,
})),
}
const assistantSeed = fixture.messages[fixture.targetID][3]!
const assistants = Array.from({ length: 14 }, (_, index) => {
const messageID = `msg_parent_hydration_${String(index).padStart(2, "0")}`
return {
...assistantSeed,
info: {
...assistantSeed.info,
id: messageID,
parentID: userID,
time: { created: 1700001001000 + index * 1_000, completed: 1700001001500 + index * 1_000 },
},
parts: assistantSeed.parts.map((part, partIndex) => ({
...part,
id: `prt_parent_hydration_${String(index).padStart(2, "0")}_${partIndex}`,
messageID,
})),
}
})
const messages = [user, ...assistants]
const target = fixture.sessions.find((session) => session.id === fixture.targetID)!
const lastID = userID
const lastPartID = assistants.at(-1)!.parts.at(-1)!.id
benchmark("hydrates an orphaned latest turn after a cold session click", async ({ browser, report }, testInfo) => {
benchmark.setTimeout(180_000)
const results = [] as Awaited<ReturnType<typeof trial>>[]
for (let run = 0; run < 5; run++) {
results.push(
await withBenchmarkPage(
browser,
`session-parent-hydration-${mode}-${run}`,
(page) => trial(page, mode),
testInfo,
),
)
}
const timing = results.map((result) => result.metrics.firstCorrectObservedMs!).sort((a, b) => a - b)
report(
{
results: results.map((result) => ({ ...result.metrics, historyGateCount: result.historyGateCount })),
summary: {
firstCorrectObservedMs: { min: timing[0], median: timing[2], max: timing.at(-1) },
blankSamples: results.map((result) => result.metrics.blankSamples),
requestCounts: {
list: results.map((result) => result.requestCounts.list),
parent: results.map((result) => result.requestCounts.parent),
},
historyGateCount: results.map((result) => result.historyGateCount),
},
},
{ mode },
)
})
async function trial(page: Page, mode: ParentHydrationBenchmarkMode) {
const requests: { type: "list" | "parent"; before?: string }[] = []
const history = mode === "candidate" ? Promise.withResolvers<void>() : undefined
let historyGates = 0
await mockOpenCodeServer(page, {
sessions: fixture.sessions.filter((session) => session.id === fixture.sourceID),
provider: fixture.provider,
directory: fixture.directory,
project: fixture.project,
messageDelay: 50,
onMessages: (request) => {
if (request.sessionID === fixture.targetID && request.phase === "start")
requests.push({ type: "list", before: request.before })
},
beforeMessagesResponse: (request) => {
if (mode !== "candidate" || request.sessionID !== fixture.targetID || !request.before) return Promise.resolve()
historyGates++
return history!.promise
},
onMessage: (request) => {
if (request.sessionID === fixture.targetID && request.messageID === userID) requests.push({ type: "parent" })
},
message: (sessionID, messageID) => {
if (sessionID !== fixture.targetID || messageID !== userID) return
return user
},
pageMessages: (sessionID, limit, before) => {
const items = sessionID === fixture.targetID ? messages : fixture.messages[fixture.sourceID]
const end = before ? items.findIndex((message) => message.info.id === before) : items.length
const start = Math.max(0, end - limit)
return { items: items.slice(start, end), cursor: start > 0 ? items[start]!.info.id : undefined }
},
})
await page.route(`**/session/${fixture.targetID}`, (route) =>
route.fulfill({ status: 200, contentType: "application/json", body: JSON.stringify(target) }),
)
await installStressSessionTabs(page, { sessionIDs: [fixture.sourceID] })
await page.goto(stressSessionHref(fixture.sourceID))
await expectSessionTitle(page, fixture.expected.sourceTitle)
await waitForStableTimeline(page, fixture.expected.sourceMessageIDs.at(-1)!)
const href = stressSessionHref(fixture.targetID)
await page.evaluate(
({ href, title }) => {
const link = document.createElement("a")
link.id = "parent-hydration-target"
link.href = href
link.textContent = title
document.body.append(link)
},
{ href, title: target.title },
)
const metrics = await measureSessionSwitch(page, {
destinationIDs: messages.map((message) => message.info.id),
sourceIDs: fixture.messages[fixture.sourceID].map((message) => message.info.id),
lastID,
requiredPartID: lastPartID,
requireBottomAnchor: false,
href,
switch: async () => {
await page.locator("#parent-hydration-target").click()
await expectSessionTitle(page, target.title)
},
}).finally(() => history?.resolve())
expect(metrics.firstCorrectObservedMs).not.toBeNull()
const requestCounts = {
list: requests.filter((request) => request.type === "list").length,
parent: requests.filter((request) => request.type === "parent").length,
}
if (mode === "candidate") {
expect(requestCounts.parent).toBe(1)
expect(historyGates).toBe(1)
}
return { metrics, requestCounts, historyGateCount: historyGates }
}
@@ -2,7 +2,13 @@ import type { Page } from "@playwright/test"
import { expectSessionTitle } from "../../utils/waits"
import { benchmark, expect, withBenchmarkPage } from "../benchmark"
import { fixture } from "./session-timeline-stress.fixture"
import { installStressSessionTabs, mockStressTimeline, stressSessionHref } from "./timeline-test-helpers"
import {
createReviewDiffs,
installStressSessionTabs,
installTimelineSettings,
mockStressTimeline,
stressSessionHref,
} from "./timeline-test-helpers"
import { measureSessionSwitch, waitForStableTimeline } from "./session-tab-switch-probe"
type Result = Awaited<ReturnType<typeof measureSessionSwitch>>
@@ -20,8 +26,41 @@ benchmark("benchmarks cold and hot session tab switching", async ({ browser, rep
report({ results, summary: summarize(results) })
})
async function trial(page: Page, mode: "cold" | "hot") {
await mockStressTimeline(page)
benchmark(
"benchmarks v2 session tab switching with and without the review pane",
async ({ browser, report }, testInfo) => {
benchmark.setTimeout(360_000)
const runs = Number(process.env.SESSION_TAB_SWITCH_RUNS ?? 5)
const results = {
closed: { cold: [] as Result[], hot: [] as Result[] },
open: { cold: [] as Result[], hot: [] as Result[] },
}
for (const reviewPane of ["closed", "open"] as const) {
for (const mode of ["cold", "hot"] as const) {
for (let run = 0; run < runs; run++) {
results[reviewPane][mode].push(
await withBenchmarkPage(
browser,
`session-tab-switch-v2-${reviewPane}-${mode}-${run}`,
(page) => trial(page, mode, { newLayoutDesigns: true, reviewPane }),
testInfo,
),
)
}
}
}
report({ results, summary: summarizeReviewPane(results) }, { runs, reviewDiffs: createReviewDiffs().length })
},
)
async function trial(
page: Page,
mode: "cold" | "hot",
options?: { newLayoutDesigns?: boolean; reviewPane?: "closed" | "open" },
) {
const reviewDiffs = options?.newLayoutDesigns ? createReviewDiffs() : undefined
await mockStressTimeline(page, { vcsDiff: reviewDiffs })
if (options?.newLayoutDesigns) await installTimelineSettings(page)
await installStressSessionTabs(page)
if (mode === "hot") {
await page.goto(stressSessionHref(fixture.targetID))
@@ -33,6 +72,10 @@ async function trial(page: Page, mode: "cold" | "hot") {
await expectSessionTitle(page, fixture.expected.sourceTitle)
}
await waitForStableTimeline(page, fixture.expected.sourceMessageIDs.at(-1)!)
if (options?.reviewPane === "open") {
await openReviewPane(page)
await waitForStableTimeline(page, fixture.expected.sourceMessageIDs.at(-1)!)
}
const destinationIDs = fixture.messages[fixture.targetID].map((message) => message.info.id)
const sourceIDs = fixture.messages[fixture.sourceID].map((message) => message.info.id)
@@ -70,6 +113,15 @@ function summarize(results: Record<"cold" | "hot", Result[]>) {
)
}
function summarizeReviewPane(results: Record<"closed" | "open", Record<"cold" | "hot", Result[]>>) {
return Object.fromEntries(
Object.entries(results).map(([reviewPane, values]) => [
reviewPane,
summarize(values as Record<"cold" | "hot", Result[]>),
]),
)
}
async function switchSession(page: Page, sessionID: string, title: string) {
const href = stressSessionHref(sessionID)
const tab = page.locator(`[data-slot="titlebar-tabs"] a[href="${href}"]`).first()
@@ -77,3 +129,16 @@ async function switchSession(page: Page, sessionID: string, title: string) {
await tab.click()
await expectSessionTitle(page, title)
}
async function openReviewPane(page: Page) {
await page.getByRole("button", { name: "Toggle review" }).click()
const panel = page.locator("#review-panel")
await expect(panel).toBeVisible()
// Text-based readiness works across review implementations; the legacy list mounts
// diff viewers lazily while V2 mounts the active preview eagerly.
await page.waitForFunction(() => {
const panel = document.querySelector<HTMLElement>("#review-panel")
const text = panel?.textContent ?? ""
return text.includes("generated-000.ts") && text.includes("+3")
})
}
@@ -4,7 +4,15 @@ export type SessionSwitchSample = {
source: string[]
hasVisibleRows: boolean
last: boolean
requiredPartVisible?: boolean
bottomAnchorRequired?: boolean
bottomErrorPx?: number
review?: {
fileHost: boolean
fileHostReplaced: boolean
header: string
replacedLevels: string[]
}
}
export function classifySessionSwitch(samples: SessionSwitchSample[]) {
@@ -23,6 +31,10 @@ export function classifySessionSwitch(samples: SessionSwitchSample[]) {
(sample) => sample.hasVisibleRows && sample.destination.length === 0 && sample.source.length === 0,
).length,
sourceSamples: samples.filter((sample) => sample.source.length > 0).length,
reviewFileHostMissingSamples: samples.filter((sample) => sample.review && !sample.review.fileHost).length,
reviewFileHostReplacedSamples: samples.filter((sample) => sample.review?.fileHostReplaced).length,
reviewHeaders: [...new Set(samples.flatMap((sample) => (sample.review ? [sample.review.header] : [])))],
reviewReplacedLevels: [...new Set(samples.flatMap((sample) => sample.review?.replacedLevels ?? []))],
}
}
@@ -31,7 +43,8 @@ export function isCorrectDestination(sample: SessionSwitchSample) {
sample.destination.length > 0 &&
sample.source.length === 0 &&
sample.last &&
Math.abs(sample.bottomErrorPx ?? Infinity) <= 1
sample.requiredPartVisible !== false &&
(sample.bottomAnchorRequired === false || Math.abs(sample.bottomErrorPx ?? Infinity) <= 1)
)
}
@@ -8,19 +8,56 @@ type SessionSwitchProbe = {
async function installSessionSwitchProbe(
page: Page,
input: { destinationIDs: string[]; sourceIDs: string[]; lastID: string; href: string },
input: {
destinationIDs: string[]
sourceIDs: string[]
lastID: string
requiredPartID?: string
requireBottomAnchor?: boolean
href: string
},
) {
await page.evaluate(({ destinationIDs, sourceIDs, lastID, href }) => {
await page.evaluate(({ destinationIDs, sourceIDs, lastID, requiredPartID, requireBottomAnchor, href }) => {
const destination = new Set(destinationIDs)
const source = new Set(sourceIDs)
const samples: SessionSwitchSample[] = []
let started: number | undefined
let running = true
const reviewLevels: Record<string, string> = {
panel: "#review-panel",
tabs: '#review-panel [data-component="tabs"]',
body: '#review-panel [data-slot="session-review-v2-body"]',
review: '#review-panel [data-component="session-review-v2"]',
preview: '#review-panel [data-slot="session-review-v2-preview"]',
scroll: '#review-panel [data-slot="session-review-v2-diff-scroll"]',
file: '#review-panel [data-component="file"][data-mode="diff"]',
}
const initialReviewNodes: Record<string, Element | null> = {}
const sample = () => {
if (!running || started === undefined) return
setTimeout(() => {
if (!running || started === undefined) return
const observedAtMs = performance.now() - started
const reviewPanel = document.querySelector<HTMLElement>("#review-panel")
const reviewFile = reviewPanel?.querySelector('[data-component="file"][data-mode="diff"]')
const initialReviewFile = initialReviewNodes.file
const replacedLevels = Object.entries(reviewLevels).flatMap(([name, selector]) => {
const initial = initialReviewNodes[name]
if (!initial) return []
const current = document.querySelector(selector)
return current && current !== initial ? [name] : []
})
const review = reviewPanel
? {
fileHost: !!reviewFile,
fileHostReplaced: !!initialReviewFile && !!reviewFile && reviewFile !== initialReviewFile,
header:
reviewPanel
.querySelector<HTMLElement>('[data-slot="session-review-v2-file-header"]')
?.textContent?.trim() ?? "",
replacedLevels,
}
: undefined
const root = [...document.querySelectorAll<HTMLElement>(".scroll-view__viewport")].find((element) =>
element.querySelector("[data-timeline-row]"),
)
@@ -36,6 +73,13 @@ async function installSessionSwitchProbe(
const rect = element.getBoundingClientRect()
return rect.bottom > view.top && rect.top < view.bottom
})
const requiredPartVisible = requiredPartID
? [...root.querySelectorAll<HTMLElement>("[data-timeline-part-id]")].some((element) => {
if (element.dataset.timelinePartId !== requiredPartID) return false
const rect = element.getBoundingClientRect()
return rect.width > 0 && rect.height > 0 && rect.bottom > view.top && rect.top < view.bottom
})
: undefined
const spacer = root.querySelector<HTMLElement>('[data-timeline-row="bottom-spacer"]')?.getBoundingClientRect()
samples.push({
observedAtMs,
@@ -43,10 +87,22 @@ async function installSessionSwitchProbe(
source: visible.filter((id) => source.has(id)),
hasVisibleRows,
last: visible.includes(lastID),
requiredPartVisible,
bottomAnchorRequired: requireBottomAnchor !== false,
bottomErrorPx: spacer ? spacer.bottom - view.bottom : undefined,
review,
})
} else {
samples.push({ observedAtMs, destination: [], source: [], hasVisibleRows: false, last: false })
samples.push({
observedAtMs,
destination: [],
source: [],
hasVisibleRows: false,
last: false,
requiredPartVisible: requiredPartID ? false : undefined,
bottomAnchorRequired: requireBottomAnchor !== false,
review,
})
}
requestAnimationFrame(sample)
}, 0)
@@ -57,6 +113,9 @@ async function installSessionSwitchProbe(
const link = event.target instanceof Element ? event.target.closest("a") : undefined
if (link?.getAttribute("href") !== href) return
started = performance.now()
for (const [name, selector] of Object.entries(reviewLevels)) {
initialReviewNodes[name] = document.querySelector(selector)
}
requestAnimationFrame(sample)
},
{ capture: true, once: true },
@@ -83,7 +142,8 @@ async function waitForStableSessionSwitch(page: Page) {
sample.destination.length > 0 &&
sample.source.length === 0 &&
sample.last &&
Math.abs(sample.bottomErrorPx ?? Infinity) <= 1,
sample.requiredPartVisible !== false &&
(sample.bottomAnchorRequired === false || Math.abs(sample.bottomErrorPx ?? Infinity) <= 1),
)
)
})
@@ -101,13 +161,27 @@ async function collectSessionSwitchResult(page: Page) {
export async function measureSessionSwitch(
page: Page,
input: { destinationIDs: string[]; sourceIDs: string[]; lastID: string; href: string; switch: () => Promise<void> },
input: {
destinationIDs: string[]
sourceIDs: string[]
lastID: string
requiredPartID?: string
requireBottomAnchor?: boolean
href: string
switch: () => Promise<void>
},
) {
const { switch: run, ...probe } = input
await installSessionSwitchProbe(page, probe)
await run()
await waitForStableSessionSwitch(page)
return collectSessionSwitchResult(page)
try {
await run()
await waitForStableSessionSwitch(page)
return await collectSessionSwitchResult(page)
} finally {
await page.evaluate(() => {
;(window as Window & { __sessionSwitchProbe?: SessionSwitchProbe }).__sessionSwitchProbe?.stop()
})
}
}
export async function waitForStableTimeline(page: Page, lastID: string) {
@@ -93,36 +93,53 @@ const assistantMessage = {
parts: [editPart],
}
export async function setupTimelineBenchmark(page: Page, options: { historyTurns: number; eventBatch: number }) {
export async function setupTimelineBenchmark(
page: Page,
options: {
historyTurns: number
eventBatch: number
newLayoutDesigns?: boolean
vcsDiff?: unknown[]
turnDiffs?: unknown[]
},
) {
const events: EventPayload[] = []
let eventBatch = options.eventBatch
const currentUserMessage = options.turnDiffs
? { ...userMessage, info: { ...userMessage.info, summary: { diffs: options.turnDiffs } } }
: userMessage
await mockOpenCodeServer(page, {
directory,
project: project(),
provider: provider(),
sessions: [session()],
vcsDiff: options.vcsDiff,
pageMessages: () => ({
items: [
...Array.from({ length: options.historyTurns }, (_, index) => performanceTurn(index)).flat(),
userMessage,
currentUserMessage,
assistantMessage,
],
}),
events: () => events.splice(0, eventBatch),
eventRetry: 16,
})
await page.addInitScript(() => {
localStorage.setItem(
"settings.v3",
JSON.stringify({
general: {
editToolPartsExpanded: true,
shellToolPartsExpanded: true,
showReasoningSummaries: true,
},
}),
)
})
await page.addInitScript(
(input) => {
localStorage.setItem(
"settings.v3",
JSON.stringify({
general: {
newLayoutDesigns: input.newLayoutDesigns,
editToolPartsExpanded: true,
shellToolPartsExpanded: true,
showReasoningSummaries: true,
},
}),
)
},
{ newLayoutDesigns: options.newLayoutDesigns ?? false },
)
await page.setViewportSize({ width: 1366, height: 768 })
const scroller = page.locator(".scroll-view__viewport", { has: page.locator("[data-timeline-row]") })
const text = page.locator(`[data-timeline-part-id="${textPartID}"]`).first()
@@ -1,3 +1,4 @@
import type { Page } from "@playwright/test"
import { benchmark, benchmarkDiagnostics, expect } from "../benchmark"
import {
buildInitialStreamEvent,
@@ -6,80 +7,300 @@ import {
textPartID,
} from "./session-timeline-benchmark.fixture"
import { startTimelineProfile } from "./session-timeline-profile"
import { createReviewDiffs } from "./timeline-test-helpers"
import {
collectTimelineStreamMetrics,
installTimelineStreamProbe,
startTimelineStreamProbe,
} from "./session-timeline-stream-probe"
type TimelineStreamOptions = {
newLayoutDesigns?: boolean
reviewDiffs?: boolean
reviewPane?: boolean
}
type ReviewPaneSample = {
observedAtMs: number
panelVisible: boolean
header: string
diffViewers: number
diffLines: number
codeBlocks: number
ready: boolean
}
type ReviewPaneProbe = {
samples: ReviewPaneSample[]
start: () => void
stop: () => void
}
const reviewReadyStreak = 3
benchmark.describe("performance: session timeline streaming", () => {
benchmark("streams assistant text without remounting or oscillating", async ({ page, report }) => {
benchmark.setTimeout(480_000)
const cpuThrottle = Number(process.env.TIMELINE_CPU_THROTTLE ?? 30)
const deltaCount = Number(process.env.TIMELINE_DELTA_COUNT ?? 160)
const historyTurns = Number(process.env.TIMELINE_HISTORY_TURNS ?? 320)
const eventBatch = Number(process.env.TIMELINE_EVENT_BATCH ?? 1)
const minimal = process.env.TIMELINE_MINIMAL === "1"
const profileCPU = process.env.TIMELINE_CPU_PROFILE === "1"
const profileVisual = !minimal && profileCPU && process.env.TIMELINE_VISUAL_PROFILE !== "0"
benchmark.setTimeout(Number(process.env.TIMELINE_COMPLETION_TIMEOUT_MS ?? 420_000) + 60_000)
const result = await runTimelineStreamBenchmark(page, {})
report(result.metrics, result.context)
})
benchmark("streams assistant text in v2 with review pane closed", async ({ page, report }) => {
benchmark.setTimeout(Number(process.env.TIMELINE_COMPLETION_TIMEOUT_MS ?? 420_000) + 60_000)
const result = await runTimelineStreamBenchmark(page, { newLayoutDesigns: true })
report(result.metrics, result.context)
})
benchmark("streams assistant text in v2 with review diffs and pane closed", async ({ page, report }) => {
benchmark.setTimeout(Number(process.env.TIMELINE_COMPLETION_TIMEOUT_MS ?? 420_000) + 60_000)
const result = await runTimelineStreamBenchmark(page, { newLayoutDesigns: true, reviewDiffs: true })
report(result.metrics, result.context)
})
benchmark("streams assistant text in v2 with review pane open", async ({ page, report }) => {
benchmark.setTimeout(Number(process.env.TIMELINE_COMPLETION_TIMEOUT_MS ?? 420_000) + 60_000)
const result = await runTimelineStreamBenchmark(page, { newLayoutDesigns: true, reviewPane: true })
report(result.metrics, result.context)
})
})
benchmark.describe("performance: review pane", () => {
benchmark("loads v2 review diffs and switches active files", async ({ page, report }) => {
benchmark.setTimeout(240_000)
const historyTurns = Number(process.env.REVIEW_PANE_HISTORY_TURNS ?? 72)
const diffs = createReviewDiffs()
const fixture = await setupTimelineBenchmark(page, {
historyTurns,
eventBatch,
eventBatch: 1,
newLayoutDesigns: true,
vcsDiff: diffs,
})
fixture.transport.enqueue(buildInitialStreamEvent(deltaCount))
const contentStart = performance.now()
fixture.transport.enqueue(buildInitialStreamEvent(1))
await expect(fixture.text).toBeVisible()
await expect(fixture.text).toContainText("Implementation plan")
const initialContentObservedMs = performance.now() - contentStart
await fixture.scrollToBottom()
await fixture.waitForStableGeometry()
const profile = await startTimelineProfile(page, { cpuThrottle, profileCPU })
await installTimelineStreamProbe(page, { textPartID, finalIndex: deltaCount, profileVisual, minimal })
const deltas = buildStreamDeltaEvents(deltaCount)
await startTimelineStreamProbe(page)
fixture.transport.enqueue(deltas)
await page.waitForFunction(
(finalIndex) =>
(
window as Window & {
__timelineStreamBenchmark?: { applied: { index: number }[] }
}
).__timelineStreamBenchmark?.applied.some((value) => value.index === finalIndex),
deltaCount,
{ timeout: 420_000 },
)
await expect(fixture.text).toContainText("benchmark-complete")
await expect(fixture.text).toContainText("Streaming")
await fixture.waitForStableGeometry()
const metrics = await collectTimelineStreamMetrics(page, {
textPartID,
finalIndex: deltaCount,
navigations: benchmarkDiagnostics(page).navigations,
})
const delivered = deltas.length - fixture.transport.pendingCount()
await profile.stop()
const open = await measureReviewPaneLoad(page, diffs[0]!.file)
const switches = []
for (const diff of diffs.slice(1, 4)) switches.push(await measureReviewNextFile(page, diff.file))
report(
{
endToEndInitialContentObservedMs: initialContentObservedMs,
...metrics,
deliveredDeltas: delivered,
pendingDeltas: fixture.transport.pendingCount(),
open,
switches,
},
{
cpuThrottle,
profileCPU,
profileVisual,
minimal,
queuedDeltas: deltas.length,
historyTurns,
eventBatch,
reviewDiffs: diffs.length,
},
)
await profile.reset()
})
})
async function runTimelineStreamBenchmark(page: Page, options: TimelineStreamOptions) {
const completionTimeoutMs = Number(process.env.TIMELINE_COMPLETION_TIMEOUT_MS ?? 420_000)
const cpuThrottle = Number(process.env.TIMELINE_CPU_THROTTLE ?? 30)
const deltaCount = Number(process.env.TIMELINE_DELTA_COUNT ?? 160)
const historyTurns = Number(process.env.TIMELINE_HISTORY_TURNS ?? 320)
const eventBatch = Number(process.env.TIMELINE_EVENT_BATCH ?? 1)
const minimal = process.env.TIMELINE_MINIMAL === "1"
const profileCPU = process.env.TIMELINE_CPU_PROFILE === "1"
const profileVisual = !minimal && profileCPU && process.env.TIMELINE_VISUAL_PROFILE !== "0"
const diffs = options.reviewDiffs || options.reviewPane ? createReviewDiffs() : undefined
const fixture = await setupTimelineBenchmark(page, {
historyTurns,
eventBatch,
newLayoutDesigns: options.newLayoutDesigns,
// Turn diffs exercise timeline data cost; the pane-open scenario serves the same
// diffs through the default git mode so it works across review implementations.
turnDiffs: options.reviewDiffs ? diffs : undefined,
vcsDiff: options.reviewPane ? diffs : undefined,
})
fixture.transport.enqueue(buildInitialStreamEvent(deltaCount))
const contentStart = performance.now()
await expect(fixture.text).toBeVisible()
await expect(fixture.text).toContainText("Implementation plan")
const initialContentObservedMs = performance.now() - contentStart
await fixture.scrollToBottom()
await fixture.waitForStableGeometry()
const reviewPane = options.reviewPane && diffs ? await measureReviewPaneLoad(page, diffs[0]!.file) : undefined
if (reviewPane) await fixture.waitForStableGeometry()
const profile = await startTimelineProfile(page, { cpuThrottle, profileCPU })
await installTimelineStreamProbe(page, { textPartID, finalIndex: deltaCount, profileVisual, minimal })
const deltas = buildStreamDeltaEvents(deltaCount)
await startTimelineStreamProbe(page)
fixture.transport.enqueue(deltas)
await page.waitForFunction(
(finalIndex) =>
(
window as Window & {
__timelineStreamBenchmark?: { applied: { index: number }[] }
}
).__timelineStreamBenchmark?.applied.some((value) => value.index === finalIndex),
deltaCount,
{ timeout: completionTimeoutMs },
)
await expect(fixture.text).toContainText("benchmark-complete")
await expect(fixture.text).toContainText("Streaming")
await fixture.waitForStableGeometry()
const metrics = await collectTimelineStreamMetrics(page, {
textPartID,
finalIndex: deltaCount,
navigations: benchmarkDiagnostics(page).navigations,
})
const delivered = deltas.length - fixture.transport.pendingCount()
await profile.stop()
const result = {
metrics: {
endToEndInitialContentObservedMs: initialContentObservedMs,
...metrics,
deliveredDeltas: delivered,
pendingDeltas: fixture.transport.pendingCount(),
reviewPane: reviewPane ?? null,
},
context: {
cpuThrottle,
profileCPU,
profileVisual,
minimal,
queuedDeltas: deltas.length,
historyTurns,
eventBatch,
newLayoutDesigns: options.newLayoutDesigns === true,
reviewPane: options.reviewPane === true ? "open" : "closed",
reviewDiffs: diffs?.length ?? 0,
},
}
await profile.reset()
return result
}
async function measureReviewPaneLoad(page: Page, file: string) {
// Default git mode reads the mocked /vcs/diff data, so opening the pane is enough
// and the flow works across review pane implementations.
await installReviewPaneProbe(page, { file })
await startReviewPaneProbe(page)
await page.getByRole("button", { name: "Toggle review" }).click()
await expect(page.locator("#review-panel")).toBeVisible()
return collectReviewPaneProbe(page)
}
async function measureReviewNextFile(page: Page, file: string) {
await installReviewPaneProbe(page, { file })
await startReviewPaneProbe(page)
await page.getByRole("button", { name: "Next file" }).click()
return collectReviewPaneProbe(page)
}
async function installReviewPaneProbe(page: Page, input: { file: string }) {
await page.evaluate((input) => {
const samples: ReviewPaneSample[] = []
const basename = input.file.split(/[\\/]/).at(-1) ?? input.file
let started: number | undefined
let running = true
const paneState = () => {
const panel = document.querySelector<HTMLElement>("#review-panel")
const review = panel?.querySelector<HTMLElement>('[data-component="session-review-v2"]')
const rect = (review ?? panel)?.getBoundingClientRect()
const text = panel?.textContent ?? ""
const previewHeader = panel?.querySelector<HTMLElement>(
'[data-slot="session-review-v2-file-header"]',
)?.textContent
const header = previewHeader ?? text
const viewers = panel ? [...panel.querySelectorAll<HTMLElement>('[data-component="file"][data-mode="diff"]')] : []
const codeBlocks = panel?.querySelectorAll("code").length ?? 0
const diffLines = viewers.reduce(
(sum, viewer) =>
sum +
(viewer.shadowRoot?.querySelectorAll("[data-line]").length ?? viewer.querySelectorAll("[data-line]").length),
0,
)
const panelVisible =
!!panel && panel.getAttribute("aria-hidden") !== "true" && !!rect && rect.width > 0 && rect.height > 0
return {
panelVisible,
header: header.slice(0, 500),
diffViewers: viewers.length,
diffLines,
codeBlocks,
ready:
panelVisible &&
header.includes(basename) &&
(viewers.length > 0 || text.includes("+3") || diffLines > 0 || codeBlocks > 0),
}
}
const sample = () => {
if (!running || started === undefined) return
requestAnimationFrame(() => {
setTimeout(() => {
if (!running || started === undefined) return
samples.push({ observedAtMs: performance.now() - started, ...paneState() })
if (performance.now() - started < 10_000) sample()
}, 0)
})
}
;(window as Window & { __reviewPaneProbe?: ReviewPaneProbe }).__reviewPaneProbe = {
samples,
start: () => {
started = performance.now()
performance.mark("opencode.review-pane.click")
sample()
},
stop: () => {
running = false
},
}
}, input)
}
async function startReviewPaneProbe(page: Page) {
await page.evaluate(() => {
;(window as Window & { __reviewPaneProbe?: ReviewPaneProbe }).__reviewPaneProbe!.start()
})
}
async function collectReviewPaneProbe(page: Page) {
await page.waitForFunction((streak) => {
const samples = (window as Window & { __reviewPaneProbe?: ReviewPaneProbe }).__reviewPaneProbe?.samples
if (!samples) return false
return samples.some((_, index) => {
const stable = samples.slice(index, index + streak)
return stable.length === streak && stable.every((sample) => sample.ready)
})
}, reviewReadyStreak)
const samples = await page.evaluate(() => {
const probe = (window as Window & { __reviewPaneProbe?: ReviewPaneProbe }).__reviewPaneProbe!
probe.stop()
return probe.samples
})
return { summary: summarizeReviewPaneSamples(samples), samples }
}
function summarizeReviewPaneSamples(samples: ReviewPaneSample[]) {
const firstReady = samples.find((sample) => sample.ready)
const stableIndex = samples.findIndex((_, index) => {
const stable = samples.slice(index, index + reviewReadyStreak)
return stable.length === reviewReadyStreak && stable.every((sample) => sample.ready)
})
return {
samples: samples.length,
firstReadyObservedMs: firstReady?.observedAtMs ?? null,
stableReadyObservedMs: stableIndex === -1 ? null : samples[stableIndex + reviewReadyStreak - 1]!.observedAtMs,
notReadySamples: samples.filter((sample) => !sample.ready).length,
maxDiffViewers: Math.max(0, ...samples.map((sample) => sample.diffViewers)),
maxDiffLines: Math.max(0, ...samples.map((sample) => sample.diffLines)),
maxCodeBlocks: Math.max(0, ...samples.map((sample) => sample.codeBlocks)),
}
}
@@ -21,7 +21,10 @@ export async function installTimelineSettings(page: Page) {
export function mockStressTimeline(
page: Page,
input?: { onMessages?: (input: { sessionID: string; before?: string; phase: "start" | "end" }) => void },
input?: {
onMessages?: (input: { sessionID: string; before?: string; phase: "start" | "end" }) => void
vcsDiff?: unknown[]
},
) {
return mockOpenCodeServer(page, {
sessions: fixture.sessions,
@@ -30,6 +33,7 @@ export function mockStressTimeline(
project: fixture.project,
pageMessages,
onMessages: input?.onMessages,
vcsDiff: input?.vcsDiff,
})
}
@@ -78,3 +82,53 @@ export function stressDraftHref(draftID: string) {
function stressServer() {
return `http://${process.env.PLAYWRIGHT_SERVER_HOST ?? "127.0.0.1"}:${process.env.PLAYWRIGHT_SERVER_PORT ?? "4096"}`
}
export function createReviewDiffs() {
return Array.from({ length: Number(process.env.REVIEW_PANE_DIFF_COUNT ?? 72) }, (_, index) => {
const lines = index % 3 === 0 ? 300 : index % 3 === 1 ? 120 : 38
const file = `src/review/generated-${String(index).padStart(3, "0")}.ts`
const before = reviewSource(index, lines)
const after = before
.replace(`value_${index}_4`, `updated_${index}_4`)
.replace(
`value_${index}_${Math.max(8, Math.floor(lines / 2))}`,
`updated_${index}_${Math.max(8, Math.floor(lines / 2))}`,
)
.replace(`value_${index}_${lines - 4}`, `updated_${index}_${lines - 4}`)
return {
file,
patch: reviewPatch(file, before, after),
additions: 3,
deletions: 3,
status: "modified" as const,
}
})
}
function reviewSource(seed: number, lines: number) {
return Array.from(
{ length: lines },
(_, index) => `export const value_${seed}_${index} = "${reviewWords(seed + index, index % 5 === 0 ? 180 : 42)}"`,
).join("\n")
}
function reviewPatch(file: string, before: string, after: string) {
const beforeLines = before.split("\n")
const afterLines = after.split("\n")
return [
`diff --git a/${file} b/${file}`,
`--- a/${file}`,
`+++ b/${file}`,
`@@ -1,${beforeLines.length} +1,${afterLines.length} @@`,
...beforeLines.flatMap((line, index) => {
const next = afterLines[index]!
if (line === next) return [` ${line}`]
return [`-${line}`, `+${next}`]
}),
].join("\n")
}
function reviewWords(seed: number, length: number) {
const words = ["alpha", "bravo", "charlie", "delta", "echo", "foxtrot", "golf", "hotel", "india", "juliet"]
return Array.from({ length: Math.ceil(length / 7) }, (_, index) => words[(seed + index * 3) % words.length]).join(" ")
}
@@ -0,0 +1,46 @@
import { expect, test } from "bun:test"
import type { Page, Route } from "@playwright/test"
import { mockOpenCodeServer } from "../../utils/mock-server"
test("applies message latency after a list response gate is released", async () => {
const events: string[] = []
const gate = Promise.withResolvers<void>()
let handler: ((route: Route) => Promise<void>) | undefined
const page = {
route: (_url: string, callback: (route: Route) => Promise<void>) => {
handler = callback
return Promise.resolve()
},
} as unknown as Page
await mockOpenCodeServer(page, {
provider: {},
directory: "C:/OpenCode",
project: {},
sessions: [{ id: "session" }],
messageDelay: 25,
beforeMessagesResponse: () => {
events.push("before")
return gate.promise
},
onMessages: (request) => events.push(request.phase),
pageMessages: () => {
events.push("page")
return { items: [] }
},
})
const response = handler!({
request: () => ({ url: () => "http://127.0.0.1:4096/session/session/message" }),
fulfill: () => {
events.push("fulfill")
return Promise.resolve()
},
} as unknown as Route)
expect(events).toEqual(["start", "before"])
const released = performance.now()
gate.resolve()
await response
expect(performance.now() - released).toBeGreaterThanOrEqual(20)
expect(events).toEqual(["start", "before", "page", "end", "fulfill"])
})
@@ -52,3 +52,35 @@ test("reports missing correctness without throwing", () => {
expect(result.firstCorrectObservedMs).toBeNull()
expect(result.stableObservedMs).toBeNull()
})
test("requires an explicitly tracked part to be visible", () => {
const result = classifySessionSwitch([
{
observedAtMs: 16,
destination: ["destination"],
source: [],
hasVisibleRows: true,
last: true,
requiredPartVisible: false,
bottomErrorPx: 0,
},
])
expect(result.firstCorrectObservedMs).toBeNull()
})
test("can measure content correctness without requiring a bottom anchor", () => {
const result = classifySessionSwitch([
{
observedAtMs: 16,
destination: ["destination"],
source: [],
hasVisibleRows: true,
last: true,
requiredPartVisible: true,
bottomAnchorRequired: false,
},
])
expect(result.firstCorrectObservedMs).toBe(16)
})
@@ -0,0 +1,55 @@
import { expect, test } from "bun:test"
import type { Page } from "@playwright/test"
import { measureSessionSwitch } from "../timeline/session-tab-switch-probe"
function testPage(waitFailure?: Error) {
const stops: unknown[] = []
const page = {
evaluate: async (_callback: unknown, input?: unknown) => {
if (input) return
stops.push(undefined)
},
waitForFunction: async () => {
if (waitFailure) throw waitFailure
},
} as unknown as Page
return { page, stops }
}
function input(run: () => Promise<void>) {
return {
destinationIDs: ["destination"],
sourceIDs: ["source"],
lastID: "destination",
href: "/session/destination",
switch: run,
}
}
test("stops sampling when the session switch fails", async () => {
const failure = new Error("switch failed")
const context = testPage()
await expect(
measureSessionSwitch(
context.page,
input(async () => Promise.reject(failure)),
),
).rejects.toBe(failure)
expect(context.stops).toHaveLength(1)
})
test("stops sampling when the stable wait fails", async () => {
const failure = new Error("stable wait failed")
const context = testPage(failure)
await expect(
measureSessionSwitch(
context.page,
input(async () => {}),
),
).rejects.toBe(failure)
expect(context.stops).toHaveLength(1)
})
@@ -0,0 +1,392 @@
import { expect, test } from "bun:test"
import {
analyzeVisualStability,
analyzeVisualStabilityByMarker,
type VisualStabilityTrace,
} from "../../utils/visual-stability"
import { analyzeVisualObservations } from "../../utils/visual-stability/analyzer"
import { legacyVisualPlan, visualPlan, type VisualInvariant } from "../../utils/visual-stability/invariant"
import { defineVisualRegions, mapVisualRegions } from "../../utils/visual-stability/regions"
function trace(samples: VisualStabilityTrace["samples"]): VisualStabilityTrace {
return { markers: [], samples }
}
test("accepts continuous visible motion", () => {
expect(
analyzeVisualStability(
trace([
frame(0, region({ width: 80, bottom: 40 }), region({ top: 40, bottom: 60 })),
frame(16, region({ width: 75, bottom: 45 }), region({ top: 45, bottom: 65 })),
frame(32, region({ width: 70, bottom: 50 }), region({ top: 50, bottom: 70 })),
]),
{ flow: ["changing", "following"] },
),
).toEqual([])
})
test("reports repeated geometry reversals", () => {
const issues = analyzeVisualStability(
trace([
frame(0, region({ width: 80 })),
frame(16, region({ width: 60 })),
frame(32, region({ width: 78 })),
frame(48, region({ width: 62 })),
]),
)
expect(issues.some((issue) => issue.includes("changing width reversed 2 times"))).toBe(true)
})
test("reports visible blanking, label reversal, and overlap", () => {
const issues = analyzeVisualStability(
trace([
frame(0, region({ label: "Exploring", opacity: 1, bottom: 40 }), region({ top: 40, bottom: 60 })),
frame(16, region({ label: "Explored", opacity: 0.2, bottom: 50 }), region({ top: 49, bottom: 69 })),
frame(32, region({ label: "Exploring", opacity: 1, bottom: 50 }), region({ top: 50, bottom: 70 })),
]),
{ flow: ["changing", "following"] },
)
expect(issues.some((issue) => issue.includes("opacity fell to 0.2"))).toBe(true)
expect(issues.some((issue) => issue.includes("label reverted"))).toBe(true)
expect(issues.some((issue) => issue.includes("overlapped following by 1px"))).toBe(true)
})
test("reports duplicate regions and unexpected remounts", () => {
const issues = analyzeVisualStability(
trace([frame(0, region({ node: 1 })), frame(16, region({ node: 2, count: 2 })), frame(32, region({ node: 2 }))]),
{ stable: ["changing"], unique: ["changing"] },
)
expect(issues.some((issue) => issue.includes("changing appeared 2 times"))).toBe(true)
expect(issues.some((issue) => issue.includes("changing remounted"))).toBe(true)
})
test("reports bottom anchor loss but permits movement while scrolled away", () => {
const anchored = analyzeVisualStability(
trace([
{ at: 0, regions: { changing: region() }, viewport: viewport(0) },
{ at: 16, regions: { changing: region() }, viewport: viewport(24) },
]),
{ preserveBottomAnchor: true },
)
const away = analyzeVisualStability(
trace([
{ at: 0, regions: { changing: region() }, viewport: viewport(80) },
{ at: 16, regions: { changing: region() }, viewport: viewport(104) },
]),
{ preserveBottomAnchor: true },
)
expect(anchored.some((issue) => issue.includes("bottom anchor moved to 24px"))).toBe(true)
expect(away).toEqual([])
})
test("reports up down up movement while preserving a bottom anchor", () => {
const issues = analyzeVisualStability(
trace([
{ at: 0, regions: { changing: region({ top: 200, bottom: 240 }) }, viewport: viewport(0) },
{ at: 16, regions: { changing: region({ top: 180, bottom: 220 }) }, viewport: viewport(0) },
{ at: 32, regions: { changing: region({ top: 196, bottom: 236 }) }, viewport: viewport(0) },
{ at: 48, regions: { changing: region({ top: 176, bottom: 216 }) }, viewport: viewport(0) },
]),
{ preserveBottomAnchor: true, maxPositionReversals: 0 },
)
expect(issues.some((issue) => issue.includes("changing top reversed 2 times"))).toBe(true)
expect(issues.some((issue) => issue.includes("changing bottom reversed 2 times"))).toBe(true)
})
test("accepts monotonic upward movement while preserving a bottom anchor", () => {
expect(
analyzeVisualStability(
trace([
{ at: 0, regions: { changing: region({ top: 200, bottom: 240 }) }, viewport: viewport(0) },
{ at: 16, regions: { changing: region({ top: 190, bottom: 230 }) }, viewport: viewport(0) },
{ at: 32, regions: { changing: region({ top: 180, bottom: 220 }) }, viewport: viewport(0) },
]),
{ preserveBottomAnchor: true, maxPositionReversals: 0 },
),
).toEqual([])
})
test("ignores overlap entirely outside the clipped timeline viewport", () => {
expect(
analyzeVisualStability(
trace([
{
at: 0,
regions: {
changing: region({ top: -200, bottom: -100 }),
following: region({ top: -150, bottom: -50 }),
},
viewport: viewport(0),
},
]),
{ flow: ["changing", "following"] },
),
).toEqual([])
})
test("reports visible anchor movement while allowing virtual scrollbar movement", () => {
const issues = analyzeVisualStability(
trace([
{ at: 0, regions: { anchor: region({ top: 100, bottom: 120 }) }, viewport: { ...viewport(100), scrollTop: 40 } },
{ at: 16, regions: { anchor: region({ top: 100, bottom: 120 }) }, viewport: { ...viewport(120), scrollTop: 60 } },
]),
{ fixed: ["anchor"] },
)
expect(issues).toEqual([])
const moved = analyzeVisualStability(
trace([
{ at: 0, regions: { anchor: region({ top: 100, bottom: 120 }) }, viewport: viewport(100) },
{ at: 16, regions: { anchor: region({ top: 112, bottom: 132 }) }, viewport: viewport(100) },
]),
{ fixed: ["anchor"] },
)
expect(moved.some((issue) => issue.includes("anchor moved 12px in the viewport"))).toBe(true)
})
test("analyzes each marked event independently", () => {
const input: VisualStabilityTrace = {
markers: [
{ at: 10, label: "grow" },
{ at: 40, label: "shrink" },
],
samples: [
frame(0, region({ top: 100 })),
frame(16, region({ top: 90 })),
frame(32, region({ top: 80 })),
frame(48, region({ top: 90 })),
frame(64, region({ top: 100 })),
],
}
expect(analyzeVisualStability(input, { maxPositionReversals: 0 })).toContain("changing top reversed 1 times")
expect(
analyzeVisualStabilityByMarker(input, {
maxPositionReversals: 0,
motion: ["changing"],
aggregateMotion: false,
}),
).toEqual([])
})
test("reports cross-event motion reversals by default", () => {
const input: VisualStabilityTrace = {
markers: [
{ at: 10, label: "up" },
{ at: 40, label: "down" },
],
samples: [
frame(0, region({ top: 100 })),
frame(16, region({ top: 90 })),
frame(32, region({ top: 80 })),
frame(48, region({ top: 90 })),
frame(64, region({ top: 100 })),
],
}
expect(analyzeVisualStabilityByMarker(input, { maxPositionReversals: 0 })).toContain("changing top reversed 1 times")
})
test("reports regions rendered in the wrong flow order", () => {
const issues = analyzeVisualStability(
trace([frame(0, region({ top: 100, bottom: 120 }), region({ top: 60, bottom: 80 }))]),
{ flow: ["changing", "following"] },
)
expect(issues.some((issue) => issue.includes("changing rendered after following"))).toBe(true)
})
test("uses painted bounds instead of clipped layout overflow", () => {
expect(
analyzeVisualStability(
trace([
frame(
0,
region({ top: 100, bottom: 140, height: 40, layoutTop: 100, layoutBottom: 300 }),
region({ top: 140, bottom: 180 }),
),
]),
{ flow: ["changing", "following"] },
),
).toEqual([])
})
test("does not report disappearance when a present row moves outside the viewport", () => {
expect(
analyzeVisualStability(
trace([
frame(0, region({ visible: true })),
frame(16, region({ visible: false, inViewport: false, top: -100, bottom: -80 })),
frame(32, region({ visible: true })),
]),
),
).toEqual([])
})
test("reports an in-viewport transparent frame between visible frames", () => {
const issues = analyzeVisualStability(
trace([
frame(0, region()),
frame(16, region({ visible: false, opacity: 0, inViewport: true })),
frame(32, region()),
]),
)
expect(issues.some((issue) => issue.includes("blanked between visible frames"))).toBe(true)
})
test("reports an in-viewport display-none frame between visible frames", () => {
const issues = analyzeVisualStability(
trace([
frame(0, region()),
frame(16, region({ visible: false, width: 0, height: 0, inViewport: true, cssHidden: true })),
frame(32, region()),
]),
)
expect(issues.some((issue) => issue.includes("blanked between visible frames"))).toBe(true)
})
test("can limit motion analysis to unaffected regions", () => {
expect(
analyzeVisualStability(
trace([
frame(0, region({ height: 20 }), region()),
frame(16, region({ height: 40 }), region()),
frame(32, region({ height: 30 }), region()),
]),
{ motion: ["following"] },
),
).toEqual([])
})
test("reports a blank frame across replacement surfaces", () => {
const issues = analyzeVisualStability(
{
markers: [],
samples: [
{ at: 0, regions: { thinking: region(), error: region({ present: false, visible: false }) } },
{
at: 16,
regions: {
thinking: region({ present: false, visible: false }),
error: region({ present: false, visible: false }),
},
},
{ at: 32, regions: { thinking: region({ present: false, visible: false }), error: region() } },
],
},
{ continuousAny: [["thinking", "error"]] },
)
expect(issues.some((issue) => issue.includes("thinking | error blanked"))).toBe(true)
})
test("reports failure to acquire the bottom anchor", () => {
const issues = analyzeVisualStability(
trace([
{ at: 0, regions: { changing: region() }, viewport: viewport(600) },
{ at: 16, regions: { changing: region() }, viewport: viewport(120) },
]),
{ acquireBottomAnchor: true },
)
expect(issues.some((issue) => issue.includes("did not acquire bottom anchor"))).toBe(true)
})
test("reports a required region that never renders", () => {
const issues = analyzeVisualStability(
trace([
{
at: 0,
regions: { changing: region({ present: false, visible: false }) },
},
]),
{ required: ["changing"] },
)
expect(issues).toContain("changing never rendered")
})
test("preserves typed region names while mapping definitions", () => {
const regions = defineVisualRegions({
changing: { selector: "[data-changing]" },
following: { selector: "[data-following]", closest: "[data-row]" },
})
const selectors = mapVisualRegions(regions, (region) => region.selector)
expect(selectors).toEqual({ changing: "[data-changing]", following: "[data-following]" })
const name: keyof typeof selectors = "changing"
expect(name).toBe("changing")
})
test("evaluates the typed invariant algebra over explicit observations", () => {
const regions = defineVisualRegions({
changing: { selector: "[data-changing]" },
following: { selector: "[data-following]" },
})
const invariants = [
{ type: "required", regions: ["changing"] },
{ type: "flow", regions: ["changing", "following"] },
] satisfies VisualInvariant<keyof typeof regions>[]
// @ts-expect-error Plans reject names that are not in the region definition.
const invalid = { type: "required", regions: ["missing"] } satisfies VisualInvariant<keyof typeof regions>
const plan = visualPlan(regions, invariants, { perMarker: true })
expect(invalid.regions).toEqual(["missing"])
expect(plan.perMarker).toBe(true)
expect(analyzeVisualObservations([frame(0, region({ bottom: 50 }), region({ top: 49, bottom: 69 }))], plan)).toEqual([
"changing overlapped following by 1px at 0ms",
])
})
test("legacy plan adapter preserves analyzer messages and order", () => {
const input = trace([
frame(0, region({ label: "Exploring", opacity: 1, bottom: 40 }), region({ top: 40, bottom: 60 })),
frame(16, region({ label: "Explored", opacity: 0.2, bottom: 50 }), region({ top: 49, bottom: 69 })),
frame(32, region({ label: "Exploring", opacity: 1, bottom: 50 }), region({ top: 50, bottom: 70 })),
])
const options = { flow: ["changing", "following"], stable: ["changing"] }
expect(analyzeVisualObservations(input.samples, legacyVisualPlan(options))).toEqual(
analyzeVisualStability(input, options),
)
})
function frame(
at: number,
changing: VisualStabilityTrace["samples"][number]["regions"][string],
following?: VisualStabilityTrace["samples"][number]["regions"][string],
) {
return { at, regions: { changing, ...(following ? { following } : {}) } }
}
function region(input: Partial<VisualStabilityTrace["samples"][number]["regions"][string]> = {}) {
return {
present: true,
visible: true,
inViewport: true,
top: 0,
bottom: 20,
width: 100,
height: 20,
opacity: 1,
count: 1,
node: 1,
label: "",
text: "",
layoutTop: input.top ?? 0,
layoutBottom: input.bottom ?? 20,
...input,
}
}
function viewport(distanceFromBottom: number) {
return { top: 0, bottom: 400, scrollTop: 100, scrollHeight: 500, clientHeight: 400, distanceFromBottom }
}