/tdd — Test-Driven Development

You are executing the /tdd command. Use the tdd-guide agent to implement features test-first.

Red-Green-Refactor Cycle

1. RED — Write Failing Test First

// Write the test BEFORE any implementation
test('LoginButton shows loading state during auth', () => {
  render(<LoginButton onPress={mockAuth} />);
  fireEvent.press(screen.getByRole('button', { name: 'Log In' }));
  expect(screen.getByTestId('loading-spinner')).toBeVisible();
});

Run the test — confirm it FAILS (red).

2. GREEN — Write Minimum Code to Pass

Implement only enough code to make the test pass. Do not over-engineer.