chore: add unit test to high frequency hooks (#17617)

web/hooks/use-breakpoints.spec.ts

@@ -0,0 +1,93 @@
+import { act, renderHook } from '@testing-library/react'
+import useBreakpoints, { MediaType } from './use-breakpoints'
+
+describe('useBreakpoints', () => {
+  const originalInnerWidth = window.innerWidth
+
+  // Mock the window resize event
+  const fireResize = (width: number) => {
+    window.innerWidth = width
+    act(() => {
+      window.dispatchEvent(new Event('resize'))
+    })
+  }
+
+  // Restore the original innerWidth after tests
+  afterAll(() => {
+    window.innerWidth = originalInnerWidth
+  })
+
+  it('should return mobile for width <= 640px', () => {
+    // Mock window.innerWidth for mobile
+    Object.defineProperty(window, 'innerWidth', {
+      writable: true,
+      configurable: true,
+      value: 640,
+    })
+
+    const { result } = renderHook(() => useBreakpoints())
+    expect(result.current).toBe(MediaType.mobile)
+  })
+
+  it('should return tablet for width > 640px and <= 768px', () => {
+    // Mock window.innerWidth for tablet
+    Object.defineProperty(window, 'innerWidth', {
+      writable: true,
+      configurable: true,
+      value: 768,
+    })
+
+    const { result } = renderHook(() => useBreakpoints())
+    expect(result.current).toBe(MediaType.tablet)
+  })
+
+  it('should return pc for width > 768px', () => {
+    // Mock window.innerWidth for pc
+    Object.defineProperty(window, 'innerWidth', {
+      writable: true,
+      configurable: true,
+      value: 1024,
+    })
+
+    const { result } = renderHook(() => useBreakpoints())
+    expect(result.current).toBe(MediaType.pc)
+  })
+
+  it('should update media type when window resizes', () => {
+    // Start with desktop
+    Object.defineProperty(window, 'innerWidth', {
+      writable: true,
+      configurable: true,
+      value: 1024,
+    })
+
+    const { result } = renderHook(() => useBreakpoints())
+    expect(result.current).toBe(MediaType.pc)
+
+    // Resize to tablet
+    fireResize(768)
+    expect(result.current).toBe(MediaType.tablet)
+
+    // Resize to mobile
+    fireResize(600)
+    expect(result.current).toBe(MediaType.mobile)
+  })
+
+  it('should clean up event listeners on unmount', () => {
+    // Spy on addEventListener and removeEventListener
+    const addEventListenerSpy = jest.spyOn(window, 'addEventListener')
+    const removeEventListenerSpy = jest.spyOn(window, 'removeEventListener')
+
+    const { unmount } = renderHook(() => useBreakpoints())
+
+    // Unmount should trigger cleanup
+    unmount()
+
+    expect(addEventListenerSpy).toHaveBeenCalledWith('resize', expect.any(Function))
+    expect(removeEventListenerSpy).toHaveBeenCalledWith('resize', expect.any(Function))
+
+    // Clean up spies
+    addEventListenerSpy.mockRestore()
+    removeEventListenerSpy.mockRestore()
+  })
+})