Writing Unit Tests with Jest

What testing pattern is demonstrated for error scenarios?

test('handles API error', async () => {
  const consoleSpy = jest.spyOn(console, 'error');
  await expect(fetchData()).rejects.toThrow();
  expect(consoleSpy).toHaveBeenCalled();
  consoleSpy.mockRestore();
});

Simple error checking
Error logging verification
This shows comprehensive error testing: 1) Verifies error throwing behavior, 2) Checks error logging occurs, 3) Tests both async and sync aspects, 4) Properly cleans up spies, 5) Ensures error handling completeness, 6) Validates error reporting, 7) Common pattern for API testing, 8) Important for reliability testing.
Exception handling
Error simulation

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