feat: implement Task 14.3 - Implement End-to-End Workflow Tests

- Created comprehensive E2E test files for critical user workflows
- test_e2e_knowledge_lifecycle.py: Complete knowledge lifecycle (ingestion→processing→storage→retrieval→analytics)
- test_e2e_basic_workflow.py: Basic workflows (add→retrieve→update→delete) with error handling
- Fixed ChromaDB schema validation: resolution_steps as string (comma-separated), not list
- Tests validate real component integration across KnowledgeManager, ChromaDB, SemanticSearch
- End-to-end validation of data flows across multiple system layers
- Technology stack analysis integration with temporary project simulation

✅ Quality: All E2E test structure correct, zero critical violations (F,E9)
✅ Tests: 5 E2E test scenarios covering major user workflows and error conditions
📋 TaskMaster: Subtask 14.3 marked complete (3/8 testing subtasks done - E2E workflows validated)
🎯 Next: Subtask 14.4 - Establish Performance Benchmark Tests

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

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

Author: MementoRC

src/uckn/storage/chromadb_connector.py

@@ -47,7 +47,7 @@ class ChromaDBConnector:
             ],
             "metadata_types": {
                 "error_category": str,
-                "resolution_steps": list,
+                "resolution_steps": str,  # Comma-separated string, e.g. "step1,step2"
                 "avg_resolution_time": (int, float),
                 "solution_id": str,
                 "created_at": str,

tests/e2e/test_e2e_basic_workflow.py

@@ -0,0 +1,121 @@
+import os
+import tempfile
+import shutil
+import pytest
+import time
+
+from src.uckn.core.organisms.knowledge_manager import KnowledgeManager
+
+@pytest.fixture(scope="module")
+def temp_knowledge_dir():
+    temp_dir = tempfile.mkdtemp(prefix="uckn_e2e_basic_")
+    yield temp_dir
+    shutil.rmtree(temp_dir)
+
+@pytest.fixture(scope="module")
+def km(temp_knowledge_dir):
+    km = KnowledgeManager(knowledge_dir=temp_knowledge_dir)
+    yield km
+
+def test_basic_end_to_end_workflow(km):
+    """Test basic end-to-end workflow: add → retrieve → update → delete"""
+    
+    # 1. Add a pattern
+    pattern = {
+        "document": "Use factory pattern for object creation.",
+        "metadata": {
+            "pattern_id": "factory1",
+            "pattern_type": "creational",
+            "technology_stack": "python",
+            "success_rate": 0.85,
+            "created_at": "2024-06-28T12:00:00Z",
+            "updated_at": "2024-06-28T12:00:00Z"
+        }
+    }
+    pattern_id = km.add_pattern(pattern)
+    assert pattern_id is not None
+
+    # 2. Retrieve the pattern
+    retrieved = km.get_pattern(pattern_id)
+    assert retrieved is not None
+    assert retrieved["document"] == pattern["document"]
+    assert retrieved["metadata"]["pattern_type"] == "creational"
+
+    # 3. Add an error solution
+    solution = {
+        "document": "Fix ImportError by checking module path and installation.",
+        "metadata": {
+            "solution_id": "import1",
+            "error_category": "ImportError",
+            "resolution_steps": "Check path,reinstall module",
+            "avg_resolution_time": 3.0,
+            "created_at": "2024-06-28T12:00:00Z",
+            "updated_at": "2024-06-28T12:00:00Z"
+        }
+    }
+    solution_id = km.add_error_solution(solution)
+    assert solution_id is not None
+
+    # 4. Retrieve the error solution
+    retrieved_solution = km.get_error_solution(solution_id)
+    assert retrieved_solution is not None
+    assert retrieved_solution["document"] == solution["document"]
+    assert retrieved_solution["metadata"]["error_category"] == "ImportError"
+
+    # 5. Test categorization
+    category_id = km.create_category("Design Patterns", "Software design patterns")
+    assert category_id is not None
+    
+    assigned = km.assign_pattern_to_category(pattern_id, category_id)
+    assert assigned
+    
+    patterns_in_cat = km.get_patterns_by_category(category_id)
+    assert pattern_id in patterns_in_cat
+
+    # 6. Test health status
+    health = km.get_health_status()
+    assert health["chromadb_available"] is True
+    assert health["semantic_search_available"] is True
+
+    # 7. Cleanup
+    deleted_pattern = km.delete_pattern(pattern_id)
+    assert deleted_pattern
+    
+    deleted_solution = km.error_solution_manager.delete_error_solution(solution_id)
+    assert deleted_solution
+    
+    deleted_category = km.delete_category(category_id)
+    assert deleted_category
+
+def test_error_handling_workflow(km):
+    """Test error handling in end-to-end workflow"""
+    
+    # Test non-existent retrievals
+    assert km.get_pattern("nonexistent") is None
+    assert km.get_error_solution("nonexistent") is None
+    
+    # Test invalid operations
+    assert not km.assign_pattern_to_category("invalid", "invalid")
+    assert not km.delete_pattern("nonexistent")
+
+def test_tech_stack_analysis_workflow(km):
+    """Test technology stack analysis workflow"""
+    
+    # Create a temporary project directory
+    temp_project = tempfile.mkdtemp(prefix="test_project_")
+    try:
+        # Create a simple Python file
+        with open(os.path.join(temp_project, "main.py"), "w") as f:
+            f.write("def hello():\n    print('Hello World')\n")
+        
+        # Analyze project
+        tech_stack = km.analyze_project_stack(temp_project)
+        assert isinstance(tech_stack, dict)
+        
+        # Should detect Python
+        languages = tech_stack.get("languages", [])
+        primary = tech_stack.get("primary_language", "")
+        assert "python" in str(languages).lower() or "python" in primary.lower()
+        
+    finally:
+        shutil.rmtree(temp_project)

tests/e2e/test_e2e_knowledge_lifecycle.py

@@ -0,0 +1,159 @@
+import os
+import tempfile
+import shutil
+import pytest
+import time
+
+from src.uckn.core.organisms.knowledge_manager import KnowledgeManager
+
+@pytest.fixture(scope="module")
+def temp_knowledge_dir():
+    temp_dir = tempfile.mkdtemp(prefix="uckn_e2e_lifecycle_")
+    yield temp_dir
+    shutil.rmtree(temp_dir)
+
+@pytest.fixture(scope="module")
+def km(temp_knowledge_dir):
+    km = KnowledgeManager(knowledge_dir=temp_knowledge_dir)
+    yield km
+
+def test_complete_knowledge_lifecycle(km):
+    """Test complete knowledge lifecycle: ingestion → processing → storage → retrieval → analytics"""
+    
+    # 1. Ingestion: Add a pattern and an error solution
+    pattern = {
+        "document": "Use dependency injection for testable code.",
+        "metadata": {
+            "pattern_id": "di1",
+            "pattern_type": "architecture",
+            "technology_stack": "python",  # String, not list
+            "success_rate": 0.92,
+            "created_at": "2024-06-28T12:00:00Z",
+            "updated_at": "2024-06-28T12:00:00Z"
+        }
+    }
+    pattern_id = km.add_pattern(pattern)
+    assert pattern_id is not None
+
+    solution = {
+        "document": "To fix AttributeError, check if the object has the attribute before accessing.",
+        "metadata": {
+            "solution_id": "attr1",
+            "error_category": "AttributeError",
+            "resolution_steps": "Use hasattr() before access",  # String, not list
+            "avg_resolution_time": 1.0,
+            "created_at": "2024-06-28T12:00:00Z",
+            "updated_at": "2024-06-28T12:00:00Z"
+        }
+    }
+    solution_id = km.add_error_solution(solution)
+    assert solution_id is not None
+
+    # 2. Processing: Verify data is processed and stored correctly
+    retrieved_pattern = km.get_pattern(pattern_id)
+    assert retrieved_pattern is not None
+    assert retrieved_pattern["document"] == pattern["document"]
+    
+    retrieved_solution = km.get_error_solution(solution_id)
+    assert retrieved_solution is not None
+    assert retrieved_solution["document"] == solution["document"]
+
+    # 3. Storage: Verify data persistence and searchability
+    # Search for patterns
+    pattern_results = km.search_patterns("dependency injection", limit=5)
+    assert isinstance(pattern_results, list)
+    assert any(r.get("id") == pattern_id for r in pattern_results)
+
+    # Search for error solutions
+    solution_results = km.search_error_solutions("AttributeError", limit=5)
+    assert isinstance(solution_results, list)
+    assert any(r.get("id") == solution_id for r in solution_results)
+
+    # 4. Retrieval: Test classification and categorization
+    # Create category and assign pattern
+    category_id = km.create_category("Architecture Patterns", "Software architecture patterns")
+    assert category_id is not None
+    
+    assigned = km.assign_pattern_to_category(pattern_id, category_id)
+    assert assigned
+    
+    # Verify pattern is in category
+    patterns_in_category = km.get_patterns_by_category(category_id)
+    assert pattern_id in patterns_in_category
+
+    # 5. Analytics: Test system health and metrics
+    health = km.get_health_status()
+    assert health["chromadb_available"] is True
+    assert health["semantic_search_available"] is True
+    assert "pattern_manager" in health["components"]
+
+    # 6. Cleanup verification
+    # Update pattern
+    updated = km.update_pattern(pattern_id, {"metadata": {"success_rate": 0.95}})
+    assert updated
+    
+    # Remove from category
+    removed = km.remove_pattern_from_category(pattern_id, category_id)
+    assert removed
+    
+    # Delete pattern and solution
+    pattern_deleted = km.delete_pattern(pattern_id)
+    assert pattern_deleted
+    
+    solution_deleted = km.error_solution_manager.delete_error_solution(solution_id)
+    assert solution_deleted
+
+def test_end_to_end_error_handling(km):
+    """Test end-to-end error handling and graceful degradation"""
+    
+    # Test non-existent pattern retrieval
+    result = km.get_pattern("nonexistent_pattern")
+    assert result is None
+    
+    # Test non-existent error solution retrieval
+    result = km.get_error_solution("nonexistent_solution")
+    assert result is None
+    
+    # Test empty search results
+    results = km.search_patterns("zyx_nonexistent_query_abc", limit=5)
+    assert isinstance(results, list)
+    assert len(results) == 0
+    
+    # Test invalid category operations
+    invalid_assignment = km.assign_pattern_to_category("invalid_pattern", "invalid_category")
+    assert not invalid_assignment
+
+def test_concurrent_operations(km):
+    """Test system behavior under concurrent operations"""
+    
+    # Add multiple patterns in sequence (simulating concurrent usage)
+    patterns = []
+    for i in range(3):
+        pattern = {
+            "document": f"Pattern {i} for concurrent testing.",
+            "metadata": {
+                "pattern_id": f"concurrent{i}",
+                "pattern_type": "test",
+                "technology_stack": "python",
+                "success_rate": 0.8 + (i * 0.05),
+                "created_at": "2024-06-28T12:00:00Z",
+                "updated_at": "2024-06-28T12:00:00Z"
+            }
+        }
+        pattern_id = km.add_pattern(pattern)
+        assert pattern_id is not None
+        patterns.append(pattern_id)
+    
+    # Verify all patterns are retrievable
+    for pattern_id in patterns:
+        retrieved = km.get_pattern(pattern_id)
+        assert retrieved is not None
+    
+    # Search should find multiple patterns
+    results = km.search_patterns("concurrent", limit=10)
+    assert len(results) >= 3
+    
+    # Clean up
+    for pattern_id in patterns:
+        deleted = km.delete_pattern(pattern_id)
+        assert deleted