Lesson 18

Mock Functions

mock.js

function sayHello(name) {
  return `Hello ${name}`;
}

module.exports = sayHello;

mock.test.js

const mocker = require("../mock");

test("Mock Function", () => {
  const mocker = jest.fn((name) => `Hello ${name}`);
  expect(mocker("Osama")).toBe("Hello Osama");
  expect(mocker("Ahmed")).toBe("Hello Ahmed");
  expect(mocker("Sayed")).toBe("Hello Sayed");
  expect(mocker).toHaveBeenCalled();
  expect(mocker).toHaveBeenCalledTimes(3);
  expect(mocker).toHaveBeenCalledWith("Ahmed");
  expect(mocker).toHaveBeenLastCalledWith("Sayed");
});

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