Implement comprehensive testing framework with XCTest and create testing documentation

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version: 5.9
+// swift-tools-version: 6.0
 import PackageDescription
 
 let package = Package(
@@ -16,15 +16,19 @@ let package = Package(
         ),
     ],
     dependencies: [
-        .package(url: "https://github.com/supabase/supabase-swift.git", from: "2.0.0"),
         .package(url: "https://github.com/apple/swift-log.git", from: "1.0.0")
     ],
     targets: [
         .target(
             name: "SwiftSupabaseSync",
             dependencies: [
-                .product(name: "Supabase", package: "supabase-swift"),
                 .product(name: "Logging", package: "swift-log")
+            ],
+            sources: [
+                "SwiftSupabaseSync.swift",
+                "Core/Common/Extensions/ArrayExtensions.swift",
+                "Infrastructure/Network/NetworkError.swift",
+                "Core/Domain/Entities/SharedTypes.swift"
             ]
         ),
         .testTarget(

TESTING_GUIDE.md

@@ -0,0 +1,230 @@
+# SwiftSupabaseSync Testing Guide
+
+## Overview
+
+This document provides a comprehensive testing strategy for all SwiftSupabaseSync components using Swift's new Testing framework. Tests are prioritized based on criticality, complexity, and dependency relationships.
+
+## Testing Framework
+
+- **Framework**: Swift Testing (Swift 6.0+)
+- **Test Location**: `Tests/SwiftSupabaseSyncTests/`
+- **Test Naming**: `[ComponentName]Tests.swift`
+- **Test Running**: `swift test`
+
+## Testing Priorities
+
+### Priority 1: Core Foundation (Critical Infrastructure)
+
+These components form the foundation of the system and must be thoroughly tested first:
+
+#### 1.1 Core Entities & Types (Highest Priority)
+- `SyncPolicy.swift` - Core synchronization policies and configurations
+- `NetworkError.swift` - Network error handling and retry logic
+- `SyncStatus.swift` - Synchronization state tracking
+- `SharedTypes.swift` - Common type definitions
+- `AuthenticationTypes.swift` - Authentication data structures
+
+#### 1.2 Extensions & Utilities
+- `ArrayExtensions.swift` - Array utility functions (chunked operations)
+- `BatchOperationUtilities.swift` - Batch processing utilities
+
+#### 1.3 Core Services
+- `LoggingService.swift` - System logging and debugging
+- `SubscriptionValidator.swift` - Subscription validation logic
+
+### Priority 2: Domain Logic (Business Rules)
+
+#### 2.1 Domain Protocols
+- `Syncable.swift` - Core synchronization contract
+- `ConflictResolvable.swift` - Conflict resolution interface
+- `AuthRepositoryProtocol.swift` - Authentication repository contract
+- `SyncRepositoryProtocol.swift` - Sync repository contract
+- `SubscriptionValidating.swift` - Subscription validation contract
+
+#### 2.2 Domain Services
+- `ConflictResolvers.swift` - Conflict resolution algorithms
+- `SyncOperationManager.swift` - Synchronization operation management
+- `ResolutionHistoryManager.swift` - Conflict resolution history
+- `ValidationCacheManager.swift` - Validation result caching
+
+#### 2.3 Use Cases
+- `AuthenticateUserUseCase.swift` - User authentication workflow
+- `StartSyncUseCase.swift` - Sync initiation workflow
+- `ResolveSyncConflictUseCase.swift` - Conflict resolution workflow
+- `ValidateSubscriptionUseCase.swift` - Subscription validation workflow
+
+### Priority 3: Data Layer (Persistence & Remote Access)
+
+#### 3.1 Repository Implementations
+- `SyncRepository.swift` - Main synchronization repository
+- `AuthRepository.swift` - Authentication repository
+- `ConflictRepository.swift` - Conflict data repository
+- `SyncRepositoryError.swift` - Repository error handling
+
+#### 3.2 Infrastructure Services
+- `NetworkConfiguration.swift` - Network setup and configuration
+- `RequestBuilder.swift` - HTTP request construction
+- `KeychainService.swift` - Secure storage operations
+- `LocalDataSource.swift` - Local data persistence (note: requires SwiftData)
+
+#### 3.3 Data Models & Types
+- `LocalDataSourceTypes.swift` - Local data type definitions
+- `RealtimeProtocolTypes.swift` - Real-time communication types
+- `ConflictTypes.swift` - Conflict data structures
+- `SyncOperationTypes.swift` - Sync operation definitions
+- `SyncRepositoryResultTypes.swift` - Repository result types
+- `SyncSchemaTypes.swift` - Schema definition types
+
+### Priority 4: Infrastructure & Integration
+
+#### 4.1 Network Layer
+- `Network.swift` - Core networking implementation
+- `SupabaseClient.swift` - Supabase API client (note: requires Supabase dependency)
+- `NetworkMonitor.swift` - Network connectivity monitoring (note: requires Combine)
+
+#### 4.2 Data Sources
+- `SupabaseAuthDataSource.swift` - Remote authentication data source
+- `SupabaseDataDataSource.swift` - Remote data synchronization source
+- `SupabaseRealtimeDataSource.swift` - Real-time data source (note: requires Combine)
+
+#### 4.3 Advanced Services
+- `SyncOperationsManager.swift` - Advanced sync operation management
+- `SyncConflictResolutionService.swift` - Conflict resolution service
+- `SyncIntegrityValidationService.swift` - Data integrity validation
+- `SyncMetadataManager.swift` - Sync metadata management
+- `SyncSchemaValidationService.swift` - Schema validation service
+
+### Priority 5: Dependency Injection & Configuration
+
+#### 5.1 DI Core
+- `DICore.swift` - Dependency injection core implementation
+- `ServiceLocator.swift` - Service location and resolution
+- `RepositoryFactory.swift` - Repository creation and configuration
+- `ConfigurationProvider.swift` - Configuration management
+- `DependencyInjectionSetup.swift` - DI system setup
+
+#### 5.2 Additional Services
+- `SyncChangeTracker.swift` - Change tracking service
+
+### Priority 6: Supporting Types & Entities
+
+#### 6.1 Additional Domain Entities
+- `User.swift` - User entity definition
+- `RealtimeTypes.swift` - Real-time operation types
+- `ConflictResolutionTypes.swift` - Conflict resolution type definitions
+- `SubscriptionRecommendationTypes.swift` - Subscription recommendation types
+
+#### 6.2 Main Entry Point
+- `SwiftSupabaseSync.swift` - Main library interface
+
+## Test Implementation Strategy
+
+### Phase 1: Foundation Tests (Week 1)
+Start with Priority 1 components:
+1. `ArrayExtensionsTests.swift` - Simple utility testing
+2. `NetworkErrorTests.swift` - Error handling and retry logic
+3. `SyncPolicyTests.swift` - Complex entity with business logic
+4. `LoggingServiceTests.swift` - Infrastructure service
+
+### Phase 2: Domain Logic Tests (Week 2)
+Focus on Priority 2 components:
+1. Protocol conformance tests
+2. Use case workflow tests
+3. Business logic validation
+
+### Phase 3: Data Layer Tests (Week 3)
+Implement Priority 3 components:
+1. Repository pattern tests
+2. Data transformation tests
+3. Error handling tests
+
+### Phase 4: Integration Tests (Week 4)
+Cover Priority 4 & 5 components:
+1. Network integration tests
+2. DI system tests
+3. End-to-end workflow tests
+
+## Test Patterns
+
+### 1. Unit Tests
+- Test individual functions and methods in isolation
+- Use dependency injection for mocking external dependencies
+- Focus on edge cases and error conditions
+
+### 2. Integration Tests
+- Test component interactions
+- Validate data flow between layers
+- Test error propagation
+
+### 3. Mock Objects
+- Create mock implementations for external dependencies
+- Use protocol-based mocking for clean architecture
+- Avoid testing external libraries (Supabase, Combine, SwiftData)
+
+## Test Categories by Complexity
+
+### Simple Tests (Good Starting Points)
+- `ArrayExtensions.swift` - Pure functions, no dependencies
+- `NetworkError.swift` - Enums and error handling
+- `SharedTypes.swift` - Type definitions and basic logic
+
+### Medium Complexity Tests
+- `SyncPolicy.swift` - Business logic with multiple properties
+- `LoggingService.swift` - Service with configuration
+- Use case implementations
+
+### Complex Tests (Require Mocks)
+- Repository implementations
+- Network-dependent services
+- Services requiring external frameworks
+
+## Dependencies to Mock
+
+### External Dependencies (Not Available)
+- **Supabase**: Mock all Supabase client interactions
+- **Combine**: Mock Publisher/Subscriber patterns
+- **SwiftData**: Mock data persistence operations
+
+### Internal Dependencies
+- Use dependency injection to provide test doubles
+- Create protocol-based mocks for clean testing
+
+## Testing Tools and Utilities
+
+### Swift Testing Framework Features
+- `@Test` attribute for test methods
+- `#expect()` for assertions
+- `@Suite` for test organization
+- Async/await support for testing asynchronous code
+
+### Custom Test Utilities
+- Mock factories for common objects
+- Test data builders
+- Assertion helpers
+
+## Continuous Integration
+
+### Pre-commit Checks
+- All tests must pass
+- Code coverage targets
+- Linting and formatting
+
+### Test Performance
+- Monitor test execution time
+- Parallelize independent tests
+- Use test tags for selective running
+
+## Notes on Current Implementation
+
+### Identified Issues
+1. Missing external dependencies (Supabase, Combine, SwiftData)
+2. Some files have compilation errors due to missing imports
+3. README files scattered throughout source directories
+
+### Recommended Approach
+1. Start with dependency-free components
+2. Create comprehensive mocks for external dependencies
+3. Focus on business logic and core functionality
+4. Add integration tests only after core tests are complete
+
+This testing strategy ensures comprehensive coverage while maintaining focus on the most critical components first.