feat: Implement comprehensive Testing Architecture Enhancement

Establishes robust testing framework with clean architecture patterns:

## Phase 1: Test Infrastructure Foundation
- Global test configuration with pytest.ini and conftest.py
- Isolated test workspaces and environment management
- Comprehensive fixture library for all test types
- Test requirements and dependency management

## Phase 2: Advanced Testing Patterns
- Test builders using builder pattern for domain objects
- Mock factories for repositories, services, and configs
- API response builders for external system simulation
- Enhanced unit tests with proper mocking and isolation

## Phase 3: Test Performance and Quality
- Performance testing framework with benchmarks
- Memory usage monitoring and leak detection
- Custom assertions for domain-specific validation
- Parametrized testing for comprehensive coverage

## Phase 4: CI/CD Integration
- GitHub Actions workflow for automated testing
- Multi-stage testing: unit → integration → e2e → performance
- Code quality checks with flake8, mypy, black, isort
- Security scanning with safety and bandit

## Testing Architecture Benefits
✅ 100+ new test infrastructure components
✅ Standardized test organization (unit/integration/e2e)
✅ Mock-based testing with no external dependencies
✅ Performance regression detection
✅ Comprehensive fixture library
✅ CI/CD pipeline with quality gates

The testing framework supports the domain logic separation and provides
a solid foundation for maintaining high code quality as the system evolves.

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

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

tests/utils/mock_factories.py

@@ -0,0 +1,346 @@
+"""
+Mock factories for creating test doubles and mocks.
+"""
+
+from unittest.mock import Mock, AsyncMock, MagicMock
+from typing import Dict, Any, List, Optional, Callable
+import asyncio
+from datetime import datetime, timezone
+
+
+class MockRepositoryFactory:
+    """Factory for creating mock repository objects."""
+
+    @staticmethod
+    def create_issue_repository() -> Mock:
+        """Create a mock issue repository."""
+        repo = AsyncMock()
+        repo.get_issue = AsyncMock()
+        repo.create_issue = AsyncMock()
+        repo.update_issue = AsyncMock()
+        repo.delete_issue = AsyncMock()
+        repo.list_issues = AsyncMock()
+        repo.search_issues = AsyncMock()
+        return repo
+
+    @staticmethod
+    def create_project_repository() -> Mock:
+        """Create a mock project repository."""
+        repo = AsyncMock()
+        repo.get_project = AsyncMock()
+        repo.create_project = AsyncMock()
+        repo.update_project = AsyncMock()
+        repo.delete_project = AsyncMock()
+        repo.list_projects = AsyncMock()
+        repo.get_issue_project_info = AsyncMock()
+        return repo
+
+    @staticmethod
+    def create_document_repository() -> Mock:
+        """Create a mock document repository."""
+        repo = AsyncMock()
+        repo.store_document = AsyncMock()
+        repo.get_document = AsyncMock()
+        repo.update_document = AsyncMock()
+        repo.delete_document = AsyncMock()
+        repo.list_documents = AsyncMock()
+        repo.search_content = AsyncMock()
+        return repo
+
+
+class MockServiceFactory:
+    """Factory for creating mock service objects."""
+
+    @staticmethod
+    def create_http_client() -> Mock:
+        """Create a mock HTTP client."""
+        client = AsyncMock()
+
+        # Default successful response
+        mock_response = AsyncMock()
+        mock_response.status = 200
+        mock_response.json = AsyncMock(return_value={"status": "success"})
+        mock_response.text = AsyncMock(return_value='{"status": "success"}')
+        mock_response.headers = {"Content-Type": "application/json"}
+
+        client.get.return_value = mock_response
+        client.post.return_value = mock_response
+        client.put.return_value = mock_response
+        client.delete.return_value = mock_response
+        client.close = AsyncMock()
+
+        return client
+
+    @staticmethod
+    def create_database_connection() -> Mock:
+        """Create a mock database connection."""
+        conn = Mock()
+        cursor = Mock()
+
+        conn.cursor.return_value = cursor
+        conn.execute.return_value = cursor
+        conn.commit = Mock()
+        conn.rollback = Mock()
+        conn.close = Mock()
+
+        # Default empty results
+        cursor.fetchone.return_value = None
+        cursor.fetchall.return_value = []
+        cursor.fetchmany.return_value = []
+        cursor.lastrowid = 1
+        cursor.rowcount = 0
+
+        return conn
+
+    @staticmethod
+    def create_cache_manager() -> Mock:
+        """Create a mock cache manager."""
+        cache = AsyncMock()
+        cache.get = AsyncMock(return_value=None)
+        cache.set = AsyncMock()
+        cache.delete = AsyncMock()
+        cache.clear = AsyncMock()
+        cache.exists = AsyncMock(return_value=False)
+        cache.expire = AsyncMock()
+        return cache
+
+    @staticmethod
+    def create_file_system() -> Mock:
+        """Create a mock file system."""
+        fs = Mock()
+        fs.read_file = Mock(return_value="mock file content")
+        fs.write_file = Mock()
+        fs.delete_file = Mock()
+        fs.exists = Mock(return_value=True)
+        fs.list_files = Mock(return_value=[])
+        fs.create_directory = Mock()
+        fs.delete_directory = Mock()
+        return fs
+
+
+class MockConfigFactory:
+    """Factory for creating mock configuration objects."""
+
+    @staticmethod
+    def create_test_config(overrides: Optional[Dict[str, Any]] = None) -> Mock:
+        """Create a mock configuration object."""
+        config = Mock()
+
+        # Default configuration values
+        defaults = {
+            "workspace_dir": "/tmp/test-workspace",
+            "database_path": "/tmp/test.db",
+            "cache_dir": "/tmp/test-cache",
+            "gitea_url": "http://test-gitea.com",
+            "gitea_token": "test-token",
+            "repo_owner": "test",
+            "repo_name": "repo",
+            "log_level": "DEBUG",
+            "max_retries": 3,
+            "timeout": 30,
+            "batch_size": 100
+        }
+
+        if overrides:
+            defaults.update(overrides)
+
+        for key, value in defaults.items():
+            setattr(config, key, value)
+
+        return config
+
+
+class MockEventFactory:
+    """Factory for creating mock event objects and event handlers."""
+
+    @staticmethod
+    def create_event_emitter() -> Mock:
+        """Create a mock event emitter."""
+        emitter = Mock()
+        emitter.emit = Mock()
+        emitter.on = Mock()
+        emitter.off = Mock()
+        emitter.once = Mock()
+        emitter.listeners = Mock(return_value=[])
+        return emitter
+
+    @staticmethod
+    def create_event_handler() -> Mock:
+        """Create a mock event handler."""
+        handler = Mock()
+        handler.handle = AsyncMock()
+        handler.can_handle = Mock(return_value=True)
+        handler.priority = 1
+        return handler
+
+
+class MockNetworkFactory:
+    """Factory for creating network-related mocks."""
+
+    @staticmethod
+    def create_rate_limiter() -> Mock:
+        """Create a mock rate limiter."""
+        limiter = AsyncMock()
+        limiter.acquire = AsyncMock()
+        limiter.release = AsyncMock()
+        limiter.is_available = AsyncMock(return_value=True)
+        limiter.reset = AsyncMock()
+        return limiter
+
+    @staticmethod
+    def create_circuit_breaker() -> Mock:
+        """Create a mock circuit breaker."""
+        breaker = Mock()
+        breaker.call = AsyncMock()
+        breaker.is_open = Mock(return_value=False)
+        breaker.is_closed = Mock(return_value=True)
+        breaker.is_half_open = Mock(return_value=False)
+        breaker.reset = Mock()
+        return breaker
+
+
+class MockTimeFactory:
+    """Factory for creating time-related mocks."""
+
+    @staticmethod
+    def create_timer() -> Mock:
+        """Create a mock timer."""
+        timer = Mock()
+        timer.start = Mock()
+        timer.stop = Mock()
+        timer.elapsed = 0.1
+        timer.reset = Mock()
+        return timer
+
+    @staticmethod
+    def create_scheduler() -> Mock:
+        """Create a mock task scheduler."""
+        scheduler = AsyncMock()
+        scheduler.schedule = AsyncMock()
+        scheduler.cancel = AsyncMock()
+        scheduler.is_scheduled = Mock(return_value=False)
+        scheduler.start = AsyncMock()
+        scheduler.stop = AsyncMock()
+        return scheduler
+
+
+class MockResponseBuilder:
+    """Builder for creating mock HTTP responses."""
+
+    def __init__(self):
+        self.status = 200
+        self.headers = {"Content-Type": "application/json"}
+        self.body = {"status": "success"}
+        self.delay = 0.0
+        self.exception = None
+
+    def with_status(self, status: int) -> "MockResponseBuilder":
+        """Set response status code."""
+        self.status = status
+        return self
+
+    def with_headers(self, headers: Dict[str, str]) -> "MockResponseBuilder":
+        """Set response headers."""
+        self.headers.update(headers)
+        return self
+
+    def with_json_body(self, body: Dict[str, Any]) -> "MockResponseBuilder":
+        """Set JSON response body."""
+        self.body = body
+        self.headers["Content-Type"] = "application/json"
+        return self
+
+    def with_text_body(self, body: str) -> "MockResponseBuilder":
+        """Set text response body."""
+        self.body = body
+        self.headers["Content-Type"] = "text/plain"
+        return self
+
+    def with_delay(self, delay: float) -> "MockResponseBuilder":
+        """Add delay to response."""
+        self.delay = delay
+        return self
+
+    def with_exception(self, exception: Exception) -> "MockResponseBuilder":
+        """Make response raise an exception."""
+        self.exception = exception
+        return self
+
+    def build(self) -> Mock:
+        """Build the mock response."""
+        if self.exception:
+            # Create a coroutine that raises the exception
+            async def raise_exception():
+                await asyncio.sleep(self.delay)
+                raise self.exception
+            return raise_exception()
+
+        response = AsyncMock()
+        response.status = self.status
+        response.headers = self.headers
+
+        if isinstance(self.body, dict):
+            response.json = AsyncMock(return_value=self.body)
+            response.text = AsyncMock(return_value=str(self.body))
+        else:
+            response.text = AsyncMock(return_value=self.body)
+            response.json = AsyncMock(side_effect=ValueError("Not JSON"))
+
+        # Add delay if specified
+        if self.delay > 0:
+            original_json = response.json
+            original_text = response.text
+
+            async def delayed_json():
+                await asyncio.sleep(self.delay)
+                return await original_json()
+
+            async def delayed_text():
+                await asyncio.sleep(self.delay)
+                return await original_text()
+
+            response.json = delayed_json
+            response.text = delayed_text
+
+        return response
+
+
+# Convenience functions
+def create_failing_mock(exception: Exception) -> Mock:
+    """Create a mock that always raises the specified exception."""
+    mock = Mock()
+    mock.side_effect = exception
+    return mock
+
+
+def create_async_failing_mock(exception: Exception) -> AsyncMock:
+    """Create an async mock that always raises the specified exception."""
+    mock = AsyncMock()
+    mock.side_effect = exception
+    return mock
+
+
+def create_sequence_mock(values: List[Any]) -> Mock:
+    """Create a mock that returns values in sequence."""
+    mock = Mock()
+    mock.side_effect = values
+    return mock
+
+
+def create_async_sequence_mock(values: List[Any]) -> AsyncMock:
+    """Create an async mock that returns values in sequence."""
+    mock = AsyncMock()
+    mock.side_effect = values
+    return mock
+
+
+def create_conditional_mock(condition: Callable[..., bool], true_value: Any, false_value: Any) -> Mock:
+    """Create a mock that returns different values based on a condition."""
+    def side_effect(*args, **kwargs):
+        if condition(*args, **kwargs):
+            return true_value
+        return false_value
+
+    mock = Mock()
+    mock.side_effect = side_effect
+    return mock