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opencode/packages/app/src/components/titlebar-history.test.ts

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+import { describe, expect, test } from "bun:test"
+import { applyPath, backPath, forwardPath, type TitlebarHistory } from "./titlebar-history"
+
+function history(): TitlebarHistory {
+  return { stack: [], index: 0, action: undefined }
+}
+
+describe("titlebar history", () => {
+  test("append and trim keeps max bounded", () => {
+    let state = history()
+    state = applyPath(state, "/", 3)
+    state = applyPath(state, "/a", 3)
+    state = applyPath(state, "/b", 3)
+    state = applyPath(state, "/c", 3)
+
+    expect(state.stack).toEqual(["/a", "/b", "/c"])
+    expect(state.stack.length).toBe(3)
+    expect(state.index).toBe(2)
+  })
+
+  test("back and forward indexes stay correct after trimming", () => {
+    let state = history()
+    state = applyPath(state, "/", 3)
+    state = applyPath(state, "/a", 3)
+    state = applyPath(state, "/b", 3)
+    state = applyPath(state, "/c", 3)
+
+    expect(state.stack).toEqual(["/a", "/b", "/c"])
+    expect(state.index).toBe(2)
+
+    const back = backPath(state)
+    expect(back?.to).toBe("/b")
+    expect(back?.state.index).toBe(1)
+
+    const afterBack = applyPath(back!.state, back!.to, 3)
+    expect(afterBack.stack).toEqual(["/a", "/b", "/c"])
+    expect(afterBack.index).toBe(1)
+
+    const forward = forwardPath(afterBack)
+    expect(forward?.to).toBe("/c")
+    expect(forward?.state.index).toBe(2)
+
+    const afterForward = applyPath(forward!.state, forward!.to, 3)
+    expect(afterForward.stack).toEqual(["/a", "/b", "/c"])
+    expect(afterForward.index).toBe(2)
+  })
+
+  test("action-driven navigation does not push duplicate history entries", () => {
+    const state: TitlebarHistory = {
+      stack: ["/", "/a", "/b"],
+      index: 2,
+      action: undefined,
+    }
+
+    const back = backPath(state)
+    expect(back?.to).toBe("/a")
+
+    const next = applyPath(back!.state, back!.to, 10)
+    expect(next.stack).toEqual(["/", "/a", "/b"])
+    expect(next.index).toBe(1)
+    expect(next.action).toBeUndefined()
+  })
+})