# 36. Write unit tests for iOS business logic

meta:
  id: native-business-logic-migration-36
  feature: native-business-logic-migration
  priority: P1
  depends_on: [native-business-logic-migration-33]
  tags: [testing, ios]

objective:
- Write comprehensive unit tests for iOS business logic

deliverables:
- FeedParserTests.swift (already exists)
- FeedFetcherTests.swift (already exists)
- DatabaseTests.swift (already exists)
- RepositoryTests.swift (new - needs implementation)
- ViewModelTests.swift (new - needs implementation)
- BackgroundSyncTests.swift (new - needs implementation)
- SearchServiceTests.swift (new - needs implementation)
- NotificationServiceTests.swift (new - needs implementation)

tests:
- Unit: FeedParser, FeedFetcher, Database, SearchHistory, SearchQuery, SyncScheduler (existing)
- Unit: Repository, ViewModel, BackgroundSync, SearchService, NotificationService (to be implemented)
- Coverage: >80% code coverage (target)

acceptance_criteria:
- All business logic covered
- Edge cases tested
- Error cases tested
- Performance tests included
- >80% code coverage

validation:
- Run `xcodebuild test`
- Check coverage report

notes:
- Use XCTest framework
- Use XCTestExpectations for async
- Mock external dependencies