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ferrannp/super-simple-cache-jest-test.js

Created May 19, 2016 12:08
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super-simple-cache-jest-test.js
it('does check if we already fetched that id and only calls fetch if necessary', () => {
const store = mockStore({id: 1234, isFetching: false }});
window.fetch = jest.fn().mockImplementation(() => Promise.resolve());
store.dispatch(fetchData(1234)); // Same id
expect(window.fetch).not.toBeCalled();
store.dispatch(fetchData(1234 + 1)); // Different id
expect(window.fetch).toBeCalled();
});
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