File size: 2,046 Bytes
1e92f2d |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 |
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(() => {
// reset events
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()
})
})
|