refactor(server): canonicalize service API (#31049)

packages/tui/test/prompt/history.test.ts

@@ -0,0 +1,39 @@
+import { describe, expect, test } from "bun:test"
+import { isDuplicateEntry, MAX_HISTORY_ENTRIES, parsePromptHistory, type PromptInfo } from "../../src/prompt/history"
+
+const entry = (input: string, parts: PromptInfo["parts"] = []): PromptInfo => ({ input, parts })
+
+describe("prompt history", () => {
+  test("recovers valid JSONL entries around corruption", () => {
+    expect(parsePromptHistory(`${JSON.stringify(entry("one"))}\nnot-json\n${JSON.stringify(entry("two"))}\n`)).toEqual([
+      entry("one"),
+      entry("two"),
+    ])
+  })
+
+  test("retains only the newest entries", () => {
+    const input = Array.from({ length: MAX_HISTORY_ENTRIES + 5 }, (_, index) =>
+      JSON.stringify(entry(String(index))),
+    ).join("\n")
+    const result = parsePromptHistory(input)
+    expect(result).toHaveLength(MAX_HISTORY_ENTRIES)
+    expect(result[0]?.input).toBe("5")
+  })
+
+  test("dedupes only identical consecutive entries", () => {
+    expect(isDuplicateEntry(undefined, entry("hello"))).toBe(false)
+    expect(isDuplicateEntry(entry("hello"), entry("hello"))).toBe(true)
+    expect(isDuplicateEntry(entry("foo"), entry("bar"))).toBe(false)
+    expect(isDuplicateEntry({ ...entry("ls"), mode: "normal" }, { ...entry("ls"), mode: "shell" })).toBe(false)
+  })
+
+  test("does not dedupe entries with different parts", () => {
+    const a = entry("describe this", [
+      { type: "file", mime: "image/png", filename: "a.png", url: "data:image/png;base64,AAA" },
+    ])
+    const b = entry("describe this", [
+      { type: "file", mime: "image/png", filename: "b.png", url: "data:image/png;base64,BBB" },
+    ])
+    expect(isDuplicateEntry(a, b)).toBe(false)
+  })
+})