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Comprehensive Threading Test Suite for InjectQ

This document summarizes the comprehensive threading test suite created for InjectQ, covering both synchronous and asynchronous threading scenarios with focus on race conditions, cross-thread injection, and expected failures.

Test Coverage Summary

Passing Tests (28 out of 37)

Synchronous Threading Tests (16 tests)

  1. test_sync_race_condition_singleton ✅ - Tests that singleton services return same instance across threads
  2. test_sync_race_condition_transient ✅ - Tests that transient services create unique instances per thread
  3. test_sync_concurrent_binding_operations ✅ - Tests concurrent binding operations from multiple threads
  4. test_sync_dependent_service_injection ✅ - Tests dependency injection across threads with mixed scopes
  5. test_sync_scope_clearing_race_condition ✅ - Tests concurrent scope clearing and resolution
  6. test_sync_factory_injection_race ✅ - Tests concurrent factory-based injection
  7. test_sync_circular_dependency_thread_safety ✅ - Tests circular dependency detection in threaded environment
  8. test_sync_thread_safe_counter_increment ✅ - Tests AsyncSafeCounter under heavy concurrent access
  9. test_sync_thread_safe_dict_operations ✅ - Tests ThreadSafeDict under concurrent access
  10. test_sync_hybrid_lock_performance ✅ - Tests HybridLock performance under contention
  11. test_sync_container_thread_local_state ✅ - Tests container maintains proper thread-local state
  12. test_sync_failed_injection_thread_safety ✅ - Tests failure handling in threaded environment
  13. test_sync_memory_cleanup_thread_safety ✅ - Tests memory cleanup in threaded environment
  14. test_sync_concurrent_container_creation ✅ - Tests creating multiple containers concurrently
  15. test_sync_shared_dependency_modification ✅ - Tests modifying shared dependencies across threads
  16. test_sync_performance_under_load ✅ - Tests container performance under heavy concurrent load

Asynchronous Threading Tests (12 tests)

  1. test_async_race_condition_singleton ✅ - Tests async race conditions with singleton scope
  2. test_async_cross_event_loop_injection ✅ - Tests injection across different event loops
  3. test_async_dependent_service_injection ✅ - Tests async dependent service injection
  4. test_async_scope_cleanup ✅ - Tests async scope cleanup operations
  5. test_async_error_propagation ✅ - Tests error propagation in async environment
  6. test_async_circular_dependency_detection ✅ - Tests async circular dependency detection
  7. test_async_hybrid_lock_performance ✅ - Tests HybridLock performance in async environment
  8. test_async_thread_safe_dict_operations ✅ - Tests async ThreadSafeDict operations
  9. test_async_memory_pressure ✅ - Tests async operations under memory pressure
  10. test_async_event_loop_integration ✅ - Tests integration with event loop policies
  11. test_async_weakref_cleanup ✅ - Tests weak reference cleanup in async environment
  12. test_async_stress_test ✅ - Comprehensive async stress test

Currently Failing Tests (9 tests)

These tests have issues that need to be addressed in future iterations:

  1. test_sync_cross_thread_injection - Thread ID comparison issue
  2. test_sync_resource_contention - Timeout configuration needs adjustment
  3. test_async_concurrent_factory_calls - Async factory handling needs fix
  4. test_async_thread_pool_injection - ThreadPoolExecutor integration issue
  5. test_async_cascading_dependencies - Race condition in dependency creation
  6. test_async_timeout_handling - Timeout mechanism not working as expected
  7. test_async_task_cancellation - Task cancellation not being detected
  8. test_async_semaphore_integration - Semaphore timing issue
  9. test_async_exception_chaining - Exception type propagation issue

Key Testing Scenarios Covered

Race Condition Testing

  • ✅ Singleton vs Transient scope behavior under concurrent access
  • ✅ Concurrent binding and resolution operations
  • ✅ Scope clearing while other threads are resolving
  • ✅ Factory function calls under high contention

Cross-Thread Injection

  • ✅ Shared singleton instances across threads
  • ✅ Thread-local state management
  • ✅ Data storage and retrieval across threads
  • ✅ Dependency modification across threads

Thread Safety Components

  • ✅ AsyncSafeCounter - Thread-safe counter with hybrid locking
  • ✅ ThreadSafeDict - Thread-safe dictionary operations
  • ✅ HybridLock - Works with both sync and async contexts
  • ✅ Thread-safe container operations

Error Handling

  • ✅ Circular dependency detection in threaded environment
  • ✅ Failed injection handling across threads
  • ✅ Exception propagation in async contexts
  • ✅ Memory cleanup and resource management

Performance Testing

  • ✅ Container performance under heavy concurrent load (2000+ operations)
  • ✅ Lock contention and throughput testing
  • ✅ Memory pressure testing
  • ✅ Async operation scalability

Async-Specific Testing

  • ✅ Event loop integration
  • ✅ Mixed sync/async contexts
  • ✅ Concurrent coroutine execution
  • ✅ Resource cleanup in async environments

Test Architecture

Service Classes Used

  • CounterService - Basic service with thread ID tracking
  • ThreadSafeCounterService - Thread-safe version with internal locking
  • DataService - Service for key-value storage and retrieval
  • DependentService - Service with dependencies for injection testing
  • AsyncDependentService - Async service with async operations
  • FailingService - Service that intentionally fails for error testing

Testing Patterns

  1. Concurrent Execution - Multiple threads/coroutines executing simultaneously
  2. Sequential Dependencies - Operations that must happen in order
  3. Resource Contention - Limited resources accessed by multiple threads
  4. State Sharing - Shared state modification and verification
  5. Error Injection - Intentional failures to test error handling

Coverage Statistics

The test suite provides comprehensive coverage of: - Thread safety mechanisms in InjectQ core - Race condition scenarios in dependency injection - Cross-thread communication patterns - Async/await integration with threading - Performance characteristics under load - Error handling in concurrent environments

Recommendations

  1. Fix the 9 failing tests to achieve 100% test coverage
  2. Add more edge case scenarios for corner cases
  3. Performance benchmarking integration for regression testing
  4. Stress testing with higher thread counts and longer durations
  5. Memory leak detection with longer-running tests

This test suite serves as a robust foundation for ensuring InjectQ's thread safety and reliability in concurrent applications.