feat: first cut at menu editor

tests/renderer/components/menuAutoExpand.test.ts

@@ -0,0 +1,63 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+import { createAutoExpandController } from '../../../src/renderer/components/MenuEditorView/menuAutoExpand';
+
+describe('createAutoExpandController', () => {
+  beforeEach(() => {
+    vi.useFakeTimers();
+  });
+
+  afterEach(() => {
+    vi.useRealTimers();
+  });
+
+  it('runs callback after configured delay', () => {
+    const controller = createAutoExpandController(300);
+    const callback = vi.fn();
+
+    controller.schedule('node-a', callback);
+    vi.advanceTimersByTime(299);
+    expect(callback).not.toHaveBeenCalled();
+
+    vi.advanceTimersByTime(1);
+    expect(callback).toHaveBeenCalledTimes(1);
+  });
+
+  it('cancels scheduled callback for a node', () => {
+    const controller = createAutoExpandController(300);
+    const callback = vi.fn();
+
+    controller.schedule('node-a', callback);
+    controller.cancel('node-a');
+    vi.runAllTimers();
+
+    expect(callback).not.toHaveBeenCalled();
+  });
+
+  it('replaces existing schedule for same node id', () => {
+    const controller = createAutoExpandController(300);
+    const first = vi.fn();
+    const second = vi.fn();
+
+    controller.schedule('node-a', first);
+    controller.schedule('node-a', second);
+    vi.runAllTimers();
+
+    expect(first).not.toHaveBeenCalled();
+    expect(second).toHaveBeenCalledTimes(1);
+  });
+
+  it('cancels all pending callbacks', () => {
+    const controller = createAutoExpandController(300);
+    const first = vi.fn();
+    const second = vi.fn();
+
+    controller.schedule('node-a', first);
+    controller.schedule('node-b', second);
+    controller.cancelAll();
+    vi.runAllTimers();
+
+    expect(first).not.toHaveBeenCalled();
+    expect(second).not.toHaveBeenCalled();
+  });
+});