flutter-tester

Reliable Flutter tests use proper mocking with Mockito, provider overrides for Riverpod, and GetIt registration resets to isolate each layer. This ensures tests remain repeatable and maintainable by enforcing test lifecycle cleanup and stubbing dependencies like SharedPreferences.

Mocking dependencies in a Flutter unit test is best done using Mockito to generate mocks and define when/then behavior. You can stub DAO and API responses, arrange success and error scenarios, and verify expected results for isolated repository testing.

Testing Riverpod providers involves using ProviderContainer helpers to override providers and manage AsyncNotifier lifecycles. This approach isolates provider state, allowing you to assert async operations and ensure deterministic results across test runs.

You can use Mockito and GetIt together for Flutter integration testing by registering mocks in GetIt and resetting them during the test lifecycle. This combination allows you to isolate service layers and stub dependencies for deterministic integration test scenarios.

Stubbing SharedPreferences in a Flutter unit test requires creating a mock or fake instance using Mockito. You then define the expected return values for storage reads and writes, ensuring your service or repository tests remain isolated from actual device storage.