Jestip, clear mocks automatically

Let’s take the following code as example.

function functionYouNeedToMock(a, b) {
  return a + b
}

beforeEach(() => {
  jest.clearAllMocks()
})

functionYouNeedToMock = jest.fn()

it("should call function", () => {
  functionYouNeedToMock()
  expect(functionYouNeedToMock).toBeCalledTimes(1)
})

it("should call function", () => {
  functionYouNeedToMock()
  expect(functionYouNeedToMock).toBeCalledTimes(1)
})

It considers that you mocked a function and you want your tests to be independent. So you’re using the jest.clearAllMocks() function to avoid undesired behaviours.

Did you know that you can activate the clearMocks option in the config in order to avoid calling jest.clearAllMocks() in each test suite ?

// jest.config.js

module.exports = {
  clearMocks: true,
}

Now you can write

function functionYouNeedToMock(a, b) {
  return a + b
}

functionYouNeedToMock = jest.fn()

it("should call function", () => {
  functionYouNeedToMock()
  expect(functionYouNeedToMock).toBeCalledTimes(1)
})

it("should call function", () => {
  functionYouNeedToMock()
  expect(functionYouNeedToMock).toBeCalledTimes(1)
})

Thanks for reading

Maxime Blanc


© 2020 Maxime Blanc. Tous droits réservés.