jest mock reset
test("mockFn.mockReset", () => { const mockFn = jest.fn().mockImplementation(() => 43); const MockClass = jest.fn(); new MockClass(); expect(mockFn()).toBe(43); expect(mockFn.mock.calls).toHaveLength(1); expect(MockClass.mock.instances).toHaveLength(1); mockFn.mockReset(); MockClass.mockReset(); new MockClass(); expect(mockFn()).toBeUndefined(); expect(mockFn.mock.calls).toHaveLength(1); expect(MockClass.mock.instances).toHaveLength(1); });
jest mock call
test("mock.calls", () => { const mockFn = jest.fn(); mockFn(1, 2); expect(mockFn.mock.calls).toEqual([[1, 2]]); });
jest mock restore
// equvalent to mockReset test("mockFn.mockRestore", () => { const StringUtils = { toUpperCase(arg) { return arg && arg.toUpperCase(); } }; const spy = jest.spyOn(StringUtils, "toUpperCase").mockImplementation(() => "MOCK"); expect(StringUtils.toUpperCase("arg")).toBe("MOCK"); expect(spy).toHaveBeenCalledTimes(1); expect(jest.isMockFunction(StringUtils.toUpperCase)).toBeTruthy(); spy.mockRestore(); expect(spy("arg")).toBeUndefined(); expect(jest.isMockFunction(StringUtils.toUpperCase)).not.toBeTruthy(); expect(StringUtils.toUpperCase("arg")).toBe("ARG"); expect(spy).toHaveBeenCalledTimes(1); });
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