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rickhanlonii/mock_basic.js

Last active February 24, 2022 06:07
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Mock Function Basic
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mock_basic.js
test("returns undefined by default", () => {
const mock = jest.fn();
let result = mock("foo");
expect(result).toBeUndefined();
expect(mock).toHaveBeenCalled();
expect(mock).toHaveBeenCalledTimes(1);
expect(mock).toHaveBeenCalledWith("foo");
});
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