Flutter Testing Standards

Priority: P0 (CRITICAL)

Core Rules

1. Test Pyramid: Unit > Widget > Integration.
2. Naming: should <behavior> when <condition>.
3. AAA: Arrange, Act, Assert in all tests.
4. Shared Mocks: test/shared/ only — no local mocks.
5. File Placement: _integration_test.dart ONLY in integration_test/.
6. Robot-First: ALL UI assertions/interactions via Robot pattern (e.g., CheckoutRobot) — never raw find.*/expect() in test body.

Widget Testing & Mocking

• Setup: Use TestWrapper.init() in setUpAll and tester.pumpLocalizedWidget(...).
• Mocking: Use GetIt registration of Mock BLoCs in setUpAll if created internally. Use blocTest for BLoC logic and whenListen for state transitions.
• Stubbing: Always stub bloc.state and bloc.stream in setUp. Prohibit any() / anyNamed().
• Async: Use settle: false for loading or stream states to verify mid-process transitions.