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benoitguigal/test.js

Created March 29, 2020 09:39
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jest mock setup
Raw
test.js
const spyReturns = returnValue => jest.fn(() => returnValue);
describe("scenario", () => {
const setup = (mockOverrides) => {
const mockedFunctions = {
a: spyReturns(true),
b: spyReturns(true),
...mockOverrides
}
return {
mockedModule: jest.doMock('../myModule', () => mockedFunctions)
}
}
it("should return true for module a", () => {
const { mockedModule } = setup();
expect(mockedModule.a()).toEqual(true)
});
it("should return override for module a", () => {
const EXPECTED_VALUE = "override"
const { mockedModule } = setup({ a: spyReturns(EXPECTED_VALUE)});
expect(mockedModule.a()).toEqual(EXPECTED_VALUE)
});
});
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