Writing Unit Tests with Jest

What advanced mocking technique is shown here?

const originalFunction = jest.requireActual('./utils').default;
jest.mock('./utils', () => ({
  __esModule: true,
  default: jest.fn(originalFunction)
}));

Simple mocking
Partial mocking
This demonstrates partial module mocking: 1) Preserves original function behavior, 2) Enables call tracking via mock, 3) Maintains module interface, 4) Supports ES modules, 5) Allows selective functionality replacement, 6) Useful for complex module testing, 7) Combines spying and mocking, 8) Better than full module mocks when needed.
Module mocking
Function spying

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