chore: refactoring and tests (#12468)

packages/app/src/components/prompt-input/history.test.ts

@@ -0,0 +1,69 @@
+import { describe, expect, test } from "bun:test"
+import type { Prompt } from "@/context/prompt"
+import { clonePromptParts, navigatePromptHistory, prependHistoryEntry, promptLength } from "./history"
+
+const DEFAULT_PROMPT: Prompt = [{ type: "text", content: "", start: 0, end: 0 }]
+
+const text = (value: string): Prompt => [{ type: "text", content: value, start: 0, end: value.length }]
+
+describe("prompt-input history", () => {
+  test("prependHistoryEntry skips empty prompt and deduplicates consecutive entries", () => {
+    const first = prependHistoryEntry([], DEFAULT_PROMPT)
+    expect(first).toEqual([])
+
+    const withOne = prependHistoryEntry([], text("hello"))
+    expect(withOne).toHaveLength(1)
+
+    const deduped = prependHistoryEntry(withOne, text("hello"))
+    expect(deduped).toBe(withOne)
+  })
+
+  test("navigatePromptHistory restores saved prompt when moving down from newest", () => {
+    const entries = [text("third"), text("second"), text("first")]
+    const up = navigatePromptHistory({
+      direction: "up",
+      entries,
+      historyIndex: -1,
+      currentPrompt: text("draft"),
+      savedPrompt: null,
+    })
+    expect(up.handled).toBe(true)
+    if (!up.handled) throw new Error("expected handled")
+    expect(up.historyIndex).toBe(0)
+    expect(up.cursor).toBe("start")
+
+    const down = navigatePromptHistory({
+      direction: "down",
+      entries,
+      historyIndex: up.historyIndex,
+      currentPrompt: text("ignored"),
+      savedPrompt: up.savedPrompt,
+    })
+    expect(down.handled).toBe(true)
+    if (!down.handled) throw new Error("expected handled")
+    expect(down.historyIndex).toBe(-1)
+    expect(down.prompt[0]?.type === "text" ? down.prompt[0].content : "").toBe("draft")
+  })
+
+  test("helpers clone prompt and count text content length", () => {
+    const original: Prompt = [
+      { type: "text", content: "one", start: 0, end: 3 },
+      {
+        type: "file",
+        path: "src/a.ts",
+        content: "@src/a.ts",
+        start: 3,
+        end: 12,
+        selection: { startLine: 1, startChar: 1, endLine: 2, endChar: 1 },
+      },
+      { type: "image", id: "1", filename: "img.png", mime: "image/png", dataUrl: "data:image/png;base64,abc" },
+    ]
+    const copy = clonePromptParts(original)
+    expect(copy).not.toBe(original)
+    expect(promptLength(copy)).toBe(12)
+    if (copy[1]?.type !== "file") throw new Error("expected file")
+    copy[1].selection!.startLine = 9
+    if (original[1]?.type !== "file") throw new Error("expected file")
+    expect(original[1].selection?.startLine).toBe(1)
+  })
+})