how to change jest mock function return value in each test?

Question

I have a mock module like this in my component test file

  jest.mock(\'../../../magic/index\', () => ({
    navigationEnabled: () => true,
    guidance         


        

Answer 1

I had a hard time getting the accepted answers to work - my equivalents of navigationEnabled and guidanceEnabled were undefined when I tried to call mockReturnValueOnce on them.

Here's what I had to do:

In ../../../magic/__mocks__/index.js:

export const navigationEnabled = jest.fn();
export const guidanceEnabled = jest.fn();

in my index.test.js file:

jest.mock('../../../magic/index');
import { navigationEnabled, guidanceEnabled } from '../../../magic/index';
import { functionThatReturnsValueOfNavigationEnabled } from 'moduleToTest';

it('is able to mock', () => {
  navigationEnabled.mockReturnValueOnce(true);
  guidanceEnabled.mockReturnValueOnce(true);
  expect(functionThatReturnsValueOfNavigationEnabled()).toBe(true);
});