Wk-notes-11-18-jest-mock

jest api

• jest.fn() function spy, can track how many times the function being called

• jest.mock() can mock a module as imports

jest.mock('./LivePricingActions', () => ({
  resetLivePricingData: jest.fn(),
  fetchOneWayPrices: jest.fn(),
  fetchReturnPrices: jest.fn(),
  updateFlightSegment: jest.fn()
}));

[!! Once a module is mocked]: If an exported function in that module is invoked sometime in the test, it MUST be mocked as a jest.fn(). Otherwise, the function will not be found.