How to partially mock a module with jest

example.js

import { functionWithDependencyThatNeedsMocking } from './service';

jest.mock('./service', () => {
  ...jest.requireActual('./service');
  dependencyThatNeedsMocking: jest.fn()
})

it('should mock the call', () => {
  const mySpy = jest.spyOn('./service', 'dependencyThatNeedsMocking')
  
  functionWithDependencyThatNeedsMocking()
  
  expect(mySpy).toHaveCallCount(1)
});