jest mock restore

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showing results for - "jest mock restore"
Emil
11 Nov 2016
1test("mockFn.mockReset", () => {
2  const mockFn = jest.fn().mockImplementation(() => 43);
3  const MockClass = jest.fn();
4
5  new MockClass();
6  expect(mockFn()).toBe(43);
7
8  expect(mockFn.mock.calls).toHaveLength(1);
9  expect(MockClass.mock.instances).toHaveLength(1);
10
11  mockFn.mockReset();
12  MockClass.mockReset();
13
14  new MockClass();
15  expect(mockFn()).toBeUndefined();
16
17  expect(mockFn.mock.calls).toHaveLength(1);
18  expect(MockClass.mock.instances).toHaveLength(1);
19});
Charlotte
15 Jun 2018
1// equvalent to mockReset
2
3test("mockFn.mockRestore", () => {
4  const StringUtils = {
5    toUpperCase(arg) {
6      return arg && arg.toUpperCase();
7    }
8  };
9
10  const spy = jest.spyOn(StringUtils, "toUpperCase").mockImplementation(() => "MOCK");
11
12  expect(StringUtils.toUpperCase("arg")).toBe("MOCK");
13  expect(spy).toHaveBeenCalledTimes(1);
14  expect(jest.isMockFunction(StringUtils.toUpperCase)).toBeTruthy();
15
16  spy.mockRestore();
17
18  expect(spy("arg")).toBeUndefined();
19  expect(jest.isMockFunction(StringUtils.toUpperCase)).not.toBeTruthy();
20  expect(StringUtils.toUpperCase("arg")).toBe("ARG");
21  expect(spy).toHaveBeenCalledTimes(1);
22 
23});
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