| import { act, renderHook } from '@testing-library/react' |
|
|
| import { useReducedMotion } from './useReducedMotion' |
|
|
| describe('useReducedMotion', () => { |
| let EVENTS: Record<string, MediaQueryHandler> = {} |
|
|
| const removeEventListenerMock = jest.fn() |
|
|
| type MediaQueryHandler = (mediaQuery: typeof mqDefaults) => void |
|
|
| const mqDefaults = { |
| matches: false, |
| onchange: null, |
| addEventListener: (name: string, handle: MediaQueryHandler) => { |
| EVENTS[name] = handle |
| }, |
| removeEventListener: removeEventListenerMock, |
| } |
|
|
| afterEach(() => { |
| |
| EVENTS = {} |
|
|
| jest.clearAllMocks() |
| }) |
|
|
| it('returns true if "Reduce motion" is enabled', async () => { |
| window.matchMedia = jest.fn().mockImplementation(query => { |
| return { |
| ...mqDefaults, |
| matches: true, |
| media: query, |
| } |
| }) |
|
|
| const { result } = renderHook(useReducedMotion) |
|
|
| expect(result.current).toBe(true) |
| }) |
|
|
| it('returns false if "Reduce motion" is disabled', async () => { |
| window.matchMedia = jest.fn().mockImplementation(query => { |
| return { |
| ...mqDefaults, |
| media: query, |
| } |
| }) |
|
|
| const { result } = renderHook(useReducedMotion) |
|
|
| expect(result.current).toBe(false) |
| }) |
|
|
| it('handles change of "prefers-reduce-motion" media query value', async () => { |
| window.matchMedia = jest.fn().mockImplementation(query => { |
| return { |
| ...mqDefaults, |
| media: query, |
| } |
| }) |
|
|
| const { result } = renderHook(useReducedMotion) |
|
|
| expect(result.current).toBe(false) |
|
|
| act(() => { |
| EVENTS.change({ |
| ...mqDefaults, |
| matches: true, |
| }) |
| }) |
|
|
| expect(result.current).toBe(true) |
| }) |
|
|
| it('successfully removes listener on unmount', () => { |
| window.matchMedia = jest.fn().mockImplementation(query => { |
| return { |
| ...mqDefaults, |
| media: query, |
| } |
| }) |
|
|
| const { unmount } = renderHook(useReducedMotion) |
|
|
| unmount() |
|
|
| expect(removeEventListenerMock).toHaveBeenCalled() |
| }) |
| }) |
|
|
