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| 1 | +import { act, renderHook } from '@testing-library/react'; |
| 2 | +import useOnlineStatus from './useOnlineStatus'; |
| 3 | + |
| 4 | +let windowSpy: jest.SpyInstance; |
| 5 | +let onlineCallback: jest.Mock; |
| 6 | +let offlineCallback: jest.Mock; |
| 7 | + |
| 8 | +describe('useOnlineStatus', () => { |
| 9 | + beforeEach(() => { |
| 10 | + windowSpy = jest.spyOn(global, 'window', 'get'); |
| 11 | + onlineCallback = jest.fn(); |
| 12 | + offlineCallback = jest.fn(); |
| 13 | + }); |
| 14 | + |
| 15 | + afterEach(() => { |
| 16 | + windowSpy.mockRestore(); |
| 17 | + }); |
| 18 | + |
| 19 | + test('온라인 상태라면 isOnline은 true이다.', () => { |
| 20 | + jest.spyOn(navigator, 'onLine', 'get').mockReturnValueOnce(true); |
| 21 | + |
| 22 | + const { result } = renderHook(() => useOnlineStatus()); |
| 23 | + |
| 24 | + expect(result.current.isOnline).toBe(true); |
| 25 | + }); |
| 26 | + |
| 27 | + test('오프라인 상태에서 isOnline은 false이다.', () => { |
| 28 | + jest.spyOn(navigator, 'onLine', 'get').mockReturnValueOnce(false); |
| 29 | + |
| 30 | + const { result } = renderHook(() => useOnlineStatus()); |
| 31 | + |
| 32 | + expect(result.current.isOnline).toBe(false); |
| 33 | + }); |
| 34 | + |
| 35 | + test('네트워크 상태가 변경되면 isOnline 상태가 갱신된다.', () => { |
| 36 | + const { result } = renderHook(() => useOnlineStatus()); |
| 37 | + |
| 38 | + act(() => { |
| 39 | + window.dispatchEvent(new Event('offline')); |
| 40 | + }); |
| 41 | + |
| 42 | + expect(result.current.isOnline).toBe(false); |
| 43 | + |
| 44 | + act(() => { |
| 45 | + window.dispatchEvent(new Event('online')); |
| 46 | + }); |
| 47 | + |
| 48 | + expect(result.current.isOnline).toBe(true); |
| 49 | + }); |
| 50 | + |
| 51 | + test('콜백 함수가 호출되는지 확인', () => { |
| 52 | + renderHook(() => useOnlineStatus({ onlineCallback, offlineCallback })); |
| 53 | + act(() => { |
| 54 | + window.dispatchEvent(new Event('offline')); |
| 55 | + }); |
| 56 | + |
| 57 | + expect(offlineCallback).toHaveBeenCalledTimes(1); |
| 58 | + |
| 59 | + act(() => { |
| 60 | + window.dispatchEvent(new Event('online')); |
| 61 | + }); |
| 62 | + expect(onlineCallback).toHaveBeenCalledTimes(1); |
| 63 | + }); |
| 64 | + |
| 65 | + test('언마운트 시 이벤트 리스너가 제거된다.', () => { |
| 66 | + const { unmount } = renderHook(() => |
| 67 | + useOnlineStatus({ onlineCallback, offlineCallback }) |
| 68 | + ); |
| 69 | + |
| 70 | + unmount(); |
| 71 | + |
| 72 | + act(() => { |
| 73 | + window.dispatchEvent(new Event('offline')); |
| 74 | + }); |
| 75 | + expect(offlineCallback).toHaveBeenCalledTimes(0); |
| 76 | + |
| 77 | + act(() => { |
| 78 | + window.dispatchEvent(new Event('online')); |
| 79 | + }); |
| 80 | + expect(onlineCallback).toHaveBeenCalledTimes(0); |
| 81 | + }); |
| 82 | +}); |
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