Add end-to-end auth session widget flow test

docs/progress.md

@@ -2,6 +2,25 @@
 
 Updated: 2026-02-15
 
+## Latest Milestone (2026-02-15): App Session Flow Test Coverage
+
+Added higher-level widget coverage for a core authenticated user journey:
+
+- New test:
+  - `test/features/app/app_auth_flow_test.dart`
+  - validates end-to-end path:
+    - sign-in screen shown by default
+    - sign-in transitions into app shell
+    - navigate to settings and sign out
+    - sign-out returns to sign-in screen
+- Uses deterministic in-memory overrides for token, local data store, sync state
+  store, and backend gateway fake.
+
+Validation for this milestone:
+
+- `flutter analyze` -> pass
+- `flutter test` -> pass
+
 ## Latest Milestone (2026-02-15): Rejected-Mutation Requeue Flow
 
 Extended sync conflict handling so rejected mutations can be retried after local

test/features/app/app_auth_flow_test.dart

@@ -0,0 +1,58 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:relationship_saver/core/auth/in_memory_token_store.dart';
+import 'package:relationship_saver/features/local/storage/local_data_store_in_memory.dart';
+import 'package:relationship_saver/features/local/storage/local_data_store_provider.dart';
+import 'package:relationship_saver/features/sync/storage/sync_state_store_in_memory.dart';
+import 'package:relationship_saver/features/sync/storage/sync_state_store_provider.dart';
+import 'package:relationship_saver/integrations/backend/backend_gateway_fake.dart';
+import 'package:relationship_saver/integrations/backend/backend_gateway_provider.dart';
+import 'package:relationship_saver/main.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+void main() {
+  setUp(() {
+    SharedPreferences.setMockInitialValues(<String, Object>{});
+  });
+
+  testWidgets('sign-in and sign-out session flow works end-to-end', (
+    WidgetTester tester,
+  ) async {
+    await tester.binding.setSurfaceSize(const Size(1280, 800));
+    addTearDown(() => tester.binding.setSurfaceSize(null));
+
+    await tester.pumpWidget(
+      ProviderScope(
+        overrides: [
+          tokenStoreProvider.overrideWithValue(InMemoryTokenStore()),
+          backendGatewayProvider.overrideWithValue(BackendGatewayFake()),
+          localDataStoreProvider.overrideWithValue(InMemoryLocalDataStore()),
+          syncStateStoreProvider.overrideWithValue(InMemorySyncStateStore()),
+        ],
+        child: const RelationshipSaverApp(),
+      ),
+    );
+    await tester.pumpAndSettle();
+
+    expect(find.text('Sign in to continue'), findsOneWidget);
+
+    await tester.tap(find.widgetWithText(FilledButton, 'Sign In'));
+    await tester.pumpAndSettle(const Duration(milliseconds: 450));
+
+    expect(find.text('Dashboard'), findsWidgets);
+
+    await tester.tap(find.text('Settings').first);
+    await tester.pumpAndSettle(const Duration(milliseconds: 450));
+
+    expect(
+      find.text('Environment and integration configuration for this build.'),
+      findsOneWidget,
+    );
+
+    await tester.tap(find.widgetWithText(FilledButton, 'Sign Out'));
+    await tester.pumpAndSettle(const Duration(milliseconds: 450));
+
+    expect(find.text('Sign in to continue'), findsOneWidget);
+  });
+}