Tester

Tester Skill

Use this skill to execute QA verifications, unit/widget tests, security audits, and layout validations.

1. UI/UX & Layout Verification

• Material Design 3: Verify components follow dynamic Material You themes, container colors (surfaceContainerLow for cards, surfaceContainerHigh for dialogs), and shape specifications.
• Haptics and Snappiness: Check that micro-animations (e.g. OpenContainer transitions) run smoothly and buttons provide tactile feedback.
• Overflow Protection: Verify all dynamically generated text is wrapped appropriately (Flexible/Expanded) to prevent RenderFlex overflow issues.
• Visual Validation: Capture screenshots of the mobile emulator (emulator-5554) to verify layouts:

  adb exec-out screencap -p > "screenshots/<filename>.png"
  

2. Codebase QA & Mocking

• Test Suite execution: Always run the full local test suite:

  flutter test
  

• Path Provider Mocking: Unit or widget tests utilizing filesystem paths must mock the path provider channel inside setUp:

  TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
      .setMockMethodCallHandler(
    const MethodChannel('plugins.flutter.io/path_provider'),
    (MethodCall methodCall) async => '.',
  );
  

• Context safety: Ensure all asynchronous callback gates check context.mounted or state mounted before executing context operations.
• Async Provider Constructor Races: SettingsProvider loads SharedPreferences asynchronously in its constructor (loadSettings()). In unit tests where a new instance is instantiated (newSettings = SettingsProvider()), insert await Future.delayed(const Duration(milliseconds: 100)) before invoking methods like restoreFromBackupMap to prevent loadSettings() from finishing later and overwriting mock test state.
• Widget Test Localization Delegates: Any widget test rendering screens that reference AppLocalizations.of(context) (e.g. SettingsScreen) must include localizationsDelegates: AppLocalizations.localizationsDelegates and supportedLocales: AppLocalizations.supportedLocales inside MaterialApp in the test widget tree to prevent null localization exceptions.

3. Data Integrity & Backups Audit

• Backup Completeness: Ensure BackupService.generateBackupJson uses SettingsProvider.toBackupMap() to export settings. Never hardcode individual SharedPreferences keys, which go stale as new options are added.
• Restore Operations: Ensure SettingsProvider.restoreFromBackupMap calls setter methods (e.g., await setShowFinancialManager(value)) instead of assigning directly to private fields. Direct assignments skip saving to SharedPreferences, causing settings to revert on app restart.
• Database Upgrades: Verify onUpgrade database migrations (especially schema/junction table changes) preserve existing user data.

4. Security Auditing

• SQLCipher: Confirm that database connections are always opened securely with the key from KeyStore.
• App Lock Screen: Verify that background state detection locks the app after the idle timeout.
• Picker & Native Dialog Lock Bypasses: Verify that screens using platform file/image pickers, share sheets (SharePlus.instance.share), or gallery permission dialogs (Gal.requestAccess) implement AppLockScreen.ignoreNextResumeLock() so that returning from native OS dialogs or sheet interfaces does not trigger the app lock screen and unmount the active widget state.
• Secure Key Storage: Never store database encryption keys or backups in unencrypted SharedPreferences. Migrate legacy backups to FlutterSecureStorage on launch and remove them from plaintext storage immediately to prevent leakage.
• Android Notifications Resource Resolution: The FlutterLocalNotificationsPlugin looks for initialization icons in the app's drawable folder (e.g. R.drawable.launcher_icon). If the resource is only defined in mipmap directories, it will fail on startup with a PlatformException(invalid_icon). Place a copy of the target icon inside the drawable folder to ensure successful native initialization.
• Tablet & Large Screen Manifest Compatibility: Ensure android.hardware.telephony, camera, and microphone features in AndroidManifest.xml have android:required="false" and <supports-screens> is configured. Otherwise, Wi-Fi tablets (e.g. Samsung Galaxy Tab S10+) will be automatically excluded from Play Store distribution.

5. Release-Mode & On-Device Verification (v2.0 learnings)

• Debug hides release-only startup races. A WorkManager task opening the SQLCipher DB in a background isolate during cold start deadlocked the app on the splash — release builds only. ALWAYS install the release APK on the emulator and cold-start it before shipping. Give background tasks an initialDelay, and wrap main()'s init Future.wait in a .timeout() so the first frame can never hang.
• Diagnosing a stuck launch: adb logcat -s flutter (engine + Dart prints), adb shell dumpsys window | grep mCurrentFocus, adb shell pidof <package>. Two "Impeller" engine lines = a background FlutterEngine (WorkManager) is also running.
• Background isolate channels: MethodChannels registered in MainActivity.configureFlutterEngine do NOT exist in WorkManager isolates — MissingPluginException from there is expected; code must catch it and prefs-only paths must still complete.
• Drive the UI, don't assume: a FAB tooltip swallowed the long-press that opened the template sheet — only caught by actually long-pressing on the emulator. Screenshot each new surface and LOOK at it.
• Test-data parity: createTestDatabase pins the CURRENT schema version — bump it together with _initDB's version: and add the onUpgrade branch, or tests diverge from production schema.
• Flutter↔Kotlin prefs types: Dart prefs.setInt stores a Long — Kotlin must read getLong(...), not getInt(...), or widget code silently falls back to defaults.