feat(files): 文件管理四项——侧栏拖拽移动、草稿跨窗口认领、未命名默认存根目录、打开所在位置（docs/25）

tests/sidebar-tree.test.tsx

@@ -99,3 +99,95 @@ describe('文件树', () => {
     container.remove()
   })
 })
+
+describe('文件树拖拽移动', () => {
+  const fireDrag = async (el: Element | undefined | null, type: string) => {
+    if (!el) throw new Error(`元素不存在，无法派发 ${type}`)
+    const e = new Event(type, { bubbles: true, cancelable: true }) as Event & { dataTransfer: Record<string, unknown> }
+    e.dataTransfer = { effectAllowed: '', dropEffect: '', setData: () => undefined, getData: () => '' }
+    await act(async () => { el.dispatchEvent(e) })
+  }
+
+  it('把文件拖到文件夹上触发移动回调', async () => {
+    const moves: { path: string; dest: string }[] = []
+    const { container, root } = await renderSidebar({
+      onMoveEntry: (entry: { path: string }, dest: string) => moves.push({ path: entry.path, dest }),
+    })
+    const file = findButton(container, 'a.md')
+    const folder = findButton(container, 'sub')
+    await fireDrag(file, 'dragstart')
+    await fireDrag(folder, 'dragover')
+    expect(folder?.className).toContain('drop-target')
+    await fireDrag(folder, 'drop')
+    expect(moves).toEqual([{ path: 'C:/ws/a.md', dest: 'C:/ws/sub' }])
+    await act(async () => { root.unmount() })
+    container.remove()
+  })
+
+  it('拖回原文件夹（根目录）不触发移动', async () => {
+    const moves: unknown[] = []
+    const { container, root } = await renderSidebar({
+      onMoveEntry: (...args: unknown[]) => moves.push(args),
+    })
+    const file = findButton(container, 'a.md')
+    const head = container.querySelector('.filetree-head')
+    await fireDrag(file, 'dragstart')
+    await fireDrag(head, 'dragover')
+    await fireDrag(head, 'drop')
+    expect(moves).toEqual([])
+    await act(async () => { root.unmount() })
+    container.remove()
+  })
+
+  it('子文件夹里的文件可以拖回根目录', async () => {
+    const moves: { path: string; dest: string }[] = []
+    const { container, root } = await renderSidebar({
+      onMoveEntry: (entry: { path: string }, dest: string) => moves.push({ path: entry.path, dest }),
+    })
+    await act(async () => {
+      findButton(container, 'sub')?.dispatchEvent(new MouseEvent('click', { bubbles: true }))
+    })
+    await act(async () => { await sleep(30) })
+    const inner = findButton(container, 'b.md')
+    const head = container.querySelector('.filetree-head')
+    await fireDrag(inner, 'dragstart')
+    await fireDrag(head, 'dragover')
+    await fireDrag(head, 'drop')
+    expect(moves).toEqual([{ path: 'C:/ws/sub/b.md', dest: 'C:/ws' }])
+    await act(async () => { root.unmount() })
+    container.remove()
+  })
+
+  it('文件夹拖到自己身上不触发移动', async () => {
+    const moves: unknown[] = []
+    const { container, root } = await renderSidebar({
+      onMoveEntry: (...args: unknown[]) => moves.push(args),
+    })
+    const folder = findButton(container, 'sub')
+    await fireDrag(folder, 'dragstart')
+    await fireDrag(folder, 'dragover')
+    await fireDrag(folder, 'drop')
+    expect(moves).toEqual([])
+    await act(async () => { root.unmount() })
+    container.remove()
+  })
+
+  it('右键菜单含「打开所在位置」并回传条目', async () => {
+    const revealed: string[] = []
+    const { container, root } = await renderSidebar({
+      onRevealEntry: (entry: { path: string }) => revealed.push(entry.path),
+    })
+    await act(async () => {
+      findButton(container, 'a.md')?.dispatchEvent(new MouseEvent('contextmenu', { bubbles: true }))
+    })
+    await act(async () => { await sleep(10) })
+    const item = findButton(container, '打开所在位置')
+    expect(item).toBeTruthy()
+    await act(async () => {
+      item?.dispatchEvent(new MouseEvent('click', { bubbles: true }))
+    })
+    expect(revealed).toEqual(['C:/ws/a.md'])
+    await act(async () => { root.unmount() })
+    container.remove()
+  })
+})