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Mock Test with jest.spyOn
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| import * as app from "./app"; | |
| import * as math from "./math"; | |
| test("calls math.add", () => { | |
| const addMock = jest.spyOn(math, "add"); | |
| // calls the original implementation | |
| expect(app.doAdd(1, 2)).toEqual(3); | |
| // and the spy stores the calls to add | |
| expect(addMock).toHaveBeenCalledWith(1, 2); | |
| }); |
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