Jestip, clear mocks automatically

24/01/2020

Banner - 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