fix: resolve flutter analyze warnings

- Remove unused imports in test files
- Add assertion on unused variable in singleton test
- Clean up redaction test file (remove unused mocks)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

+2 -19
test/services/coves_auth_service_redaction_test.dart
···
import 'package:coves_flutter/models/coves_session.dart';
import 'package:coves_flutter/services/coves_auth_service.dart';
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import 'package:dio/dio.dart';
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import 'package:flutter_secure_storage/flutter_secure_storage.dart';
import 'package:flutter_test/flutter_test.dart';
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import 'package:mockito/annotations.dart';
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import 'package:mockito/mockito.dart';
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import 'coves_auth_service_test.mocks.dart';
/// Tests for sensitive data redaction in CovesAuthService
///
/// Verifies that sensitive parameters (tokens) are properly redacted
/// from debug logs while preserving useful debugging information.
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@GenerateMocks([Dio, FlutterSecureStorage])
void main() {
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late CovesAuthService service;
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late MockDio mockDio;
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late MockFlutterSecureStorage mockStorage;
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setUp(() {
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mockDio = MockDio();
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mockStorage = MockFlutterSecureStorage();
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// Create a test instance
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service = CovesAuthService.createTestInstance(
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dio: mockDio,
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storage: mockStorage,
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);
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// Reset singleton state before each test
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CovesAuthService.resetInstance();
});
tearDown(() {
+1
test/services/coves_auth_service_singleton_test.dart
···
test('resetInstance() should clear the singleton', () {
// Arrange
final instance1 = CovesAuthService(dio: mockDio, storage: mockStorage);
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expect(instance1, isNotNull); // Verify initial singleton exists
// Act
CovesAuthService.resetInstance();
-1
test/services/coves_auth_service_validation_test.dart
···
import 'package:flutter_secure_storage/flutter_secure_storage.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:mockito/annotations.dart';
-
import 'package:mockito/mockito.dart';
import 'coves_auth_service_test.mocks.dart';