| describe('Using jest.fn() for Custom Mocking', () => { | |
| let mockAxiosGet; | |
| beforeEach(() => { | |
| mockAxiosGet = jest.fn(); // Create a custom mock function | |
| axios.get = mockAxiosGet; // Override axios.get with the mock function | |
| }); | |
| afterEach(() => { | |
| jest.restoreAllMocks(); | |
| }); | |
| it('mocks API with custom jest.fn()', async () => { | |
| const data = { name: 'Jane Doe' }; | |
| mockAxiosGet.mockResolvedValueOnce({ data }); | |
| const result = await fetchData('https://api.example.com/user/1'); | |
| expect(result).toEqual(data); | |
| expect(mockAxiosGet).toHaveBeenCalledWith('https://api.example.com/user/1'); | |
| }); | |
| it('mocks API with multiple jest.fn() calls', async () => { | |
| const firstResponse = { name: 'John Doe' }; | |
| const secondResponse = { name: 'Jane Doe' }; | |
| mockAxiosGet | |
| .mockResolvedValueOnce({ data: firstResponse }) | |
| .mockResolvedValueOnce({ data: secondResponse }); | |
| const firstResult = await fetchData('https://api.example.com/user/1'); | |
| const secondResult = await fetchData('https://api.example.com/user/2'); | |
| expect(firstResult).toEqual(firstResponse); | |
| expect(secondResult).toEqual(secondResponse); | |
| expect(mockAxiosGet).toHaveBeenCalledTimes(2); | |
| }); | |
| }); |