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

You can mock the module so it returns spies and import it into your test:

import {navigationEnabled, guidanceEnabled} from '../../../magic/index'jest.mock('../../../magic/index', () => ({    navigationEnabled: jest.fn(),    guidanceEnabled: jest.fn()}));

Then later on you can change the actual implementation using mockImplementation

navigationEnabled.mockImplementation(()=> true)//ornavigationEnabled.mockReturnValueOnce(true);

and in the next test

navigationEnabled.mockImplementation(()=> false)//ornavigationEnabled.mockReturnValueOnce(false);

what you want to do is

import { navigationEnabled, guidanceEnabled } from '../../../magic/index';   jest.mock('../../../magic/index', () => ({  navigationEnabled: jest.fn(),  guidanceEnabled: jest.fn()}));describe('test suite', () => {  it('every test', () => {    navigationEnabled.mockReturnValueOnce(value);    guidanceEnabled.mockReturnValueOnce(value);  });});

you can look more about these functions here =>https://facebook.github.io/jest/docs/mock-functions.html#mock-return-values

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);});