Jest mocking

mock.test.ts

import { nanoid } from 'nanoid/non-secure';
import { Autolog } from '../autolog';

jest.mock('nanoid/non-secure');

jest.mock('../autolog', () => {
  const actual = jest.requireActual('../autolog');
  return {
    __esModule: true,
    ...actual,
    Autolog: jest.fn().mockImplementation(actual.Autolog),
  };
});

// nanoid example
beforeEach(() => {
  const mockNanoid = nanoid as jest.MockedFunction<typeof nanoid>;
  mockNanoid.mockReturnValueOnce('testid');
  // now something in depths of code nanoid will return 'testid'
});
    
// autolog example
beforeEach(() => {
  Autolog.mockClear();
});

it('provides autolog', () => {
  expect(Autolog).toHaveBeenCalledTimes(1);
});