how to test fetch

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Caroline
25 Aug 2017
1function mockFetch(data) {
2  return jest.fn().mockImplementation(() =>
3    Promise.resolve({
4      ok: true,
5      json: () => data
6    })
7  );
8}
9
10test('fetchPerson()', async () => {
11  fetch = mockFetch(someJson); // or window.fetch
12
13  const person = await fetchPerson('whatever id');
14  expect(person).toEqual(someJson);
15
16  // Make sure fetch has been called exactly once
17  expect(fetch).toHaveBeenCalledTimes(1);
18});
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