test(app): add manual performance diagnostics (#32937)

2026-06-19 19:39:02 +02:00
parent 10ec856ff2
commit c6083a474c
26 changed files with 2656 additions and 3 deletions
@@ -0,0 +1,54 @@
+import { expect, test } from "bun:test"
+import { classifySessionSwitch } from "../timeline/session-tab-switch-metrics"
+
+test("counts source and blank samples before the destination is observed", () => {
+  const result = classifySessionSwitch([
+    { observedAtMs: 16, destination: [], source: ["source"], hasVisibleRows: true, last: false },
+    { observedAtMs: 32, destination: [], source: [], hasVisibleRows: false, last: false },
+    { observedAtMs: 48, destination: ["destination"], source: [], hasVisibleRows: true, last: true, bottomErrorPx: 0 },
+    { observedAtMs: 64, destination: ["destination"], source: [], hasVisibleRows: true, last: true, bottomErrorPx: 0 },
+    { observedAtMs: 80, destination: ["destination"], source: [], hasVisibleRows: true, last: true, bottomErrorPx: 0 },
+  ])
+
+  expect(result.blankSamples).toBe(1)
+  expect(result.sourceSamples).toBe(1)
+  expect(result.unknownSamples).toBe(0)
+  expect(result.firstDestinationObservedMs).toBe(48)
+  expect(result.stableObservedMs).toBe(80)
+})
+
+test("does not classify mixed source and destination content as correct", () => {
+  const result = classifySessionSwitch([
+    {
+      observedAtMs: 16,
+      destination: ["destination"],
+      source: ["source"],
+      hasVisibleRows: true,
+      last: true,
+      bottomErrorPx: 0,
+    },
+    { observedAtMs: 32, destination: ["destination"], source: [], hasVisibleRows: true, last: true, bottomErrorPx: 0 },
+    { observedAtMs: 48, destination: ["destination"], source: [], hasVisibleRows: true, last: true, bottomErrorPx: 0 },
+    { observedAtMs: 64, destination: ["destination"], source: [], hasVisibleRows: true, last: true, bottomErrorPx: 0 },
+  ])
+
+  expect(result.firstCorrectObservedMs).toBe(32)
+  expect(result.stableObservedMs).toBe(64)
+})
+
+test("reports missing correctness without throwing", () => {
+  const result = classifySessionSwitch([
+    {
+      observedAtMs: 16,
+      destination: ["destination"],
+      source: ["source"],
+      hasVisibleRows: true,
+      last: true,
+      bottomErrorPx: 0,
+    },
+  ])
+
+  expect(result.firstDestinationObservedMs).toBe(16)
+  expect(result.firstCorrectObservedMs).toBeNull()
+  expect(result.stableObservedMs).toBeNull()
+})