test(web): exprEvaluator + useDebouncedValue 单元测试 — 24 个用例

exprEvaluator(19): 等值/不等/AND/OR/NOT/括号/短路运算/
  missing field/type coercion/visibleWhen 便捷函数。
useDebouncedValue(5): 初始值/防抖/快速更新重置/自定义延迟/数值类型。

apps/web/src/hooks/useDebouncedValue.test.ts

@@ -0,0 +1,78 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'
+import { renderHook, act } from '@testing-library/react'
+import { useDebouncedValue } from './useDebouncedValue'
+
+describe('useDebouncedValue', () => {
+  beforeEach(() => {
+    vi.useFakeTimers()
+  })
+
+  afterEach(() => {
+    vi.useRealTimers()
+  })
+
+  it('returns initial value immediately', () => {
+    const { result } = renderHook(() => useDebouncedValue('hello'))
+    expect(result.current).toBe('hello')
+  })
+
+  it('debounces value updates', () => {
+    const { result, rerender } = renderHook(
+      ({ value }) => useDebouncedValue(value, 300),
+      { initialProps: { value: 'a' } },
+    )
+
+    expect(result.current).toBe('a')
+
+    rerender({ value: 'b' })
+    expect(result.current).toBe('a')
+
+    act(() => { vi.advanceTimersByTime(299) })
+    expect(result.current).toBe('a')
+
+    act(() => { vi.advanceTimersByTime(1) })
+    expect(result.current).toBe('b')
+  })
+
+  it('resets timer on rapid updates', () => {
+    const { result, rerender } = renderHook(
+      ({ value }) => useDebouncedValue(value, 200),
+      { initialProps: { value: 'a' } },
+    )
+
+    rerender({ value: 'b' })
+    act(() => { vi.advanceTimersByTime(100) })
+
+    rerender({ value: 'c' })
+    act(() => { vi.advanceTimersByTime(100) })
+    expect(result.current).toBe('a')
+
+    act(() => { vi.advanceTimersByTime(100) })
+    expect(result.current).toBe('c')
+  })
+
+  it('uses custom delay', () => {
+    const { result, rerender } = renderHook(
+      ({ value }) => useDebouncedValue(value, 500),
+      { initialProps: { value: 'x' } },
+    )
+
+    rerender({ value: 'y' })
+    act(() => { vi.advanceTimersByTime(499) })
+    expect(result.current).toBe('x')
+
+    act(() => { vi.advanceTimersByTime(1) })
+    expect(result.current).toBe('y')
+  })
+
+  it('works with numeric values', () => {
+    const { result, rerender } = renderHook(
+      ({ value }) => useDebouncedValue(value, 100),
+      { initialProps: { value: 0 } },
+    )
+
+    rerender({ value: 42 })
+    act(() => { vi.advanceTimersByTime(100) })
+    expect(result.current).toBe(42)
+  })
+})