Implement Comprehensive MCP Tool End-to-End Testing

[milliondreams]

Priority: P1 - Test Infrastructure MCP Coverage

Parent Issue: #71 - Complete Test Infrastructure Implementation

Description:
Implement comprehensive end-to-end testing for all 18+ MCP tools with parameter validation, error handling, and response format validation.

Current Gap:

• Limited MCP tool testing coverage
• No comprehensive parameter validation testing
• Missing error condition testing
• No response format validation

MCP Tools Requiring Comprehensive Testing:

1. Core Navigation Tools:

• trace_path - Path tracing functionality
• search_symbols - Symbol search validation
• find_definitions - Definition location accuracy
• find_references - Reference finding completeness
• explore_directory - Directory exploration coverage

2. Analysis Tools:

• analyze_complexity - Complexity metric validation
• analyze_performance - Performance analysis accuracy
• analyze_security - Security vulnerability detection
• analyze_dependencies - Dependency analysis completeness
• code_quality_analysis - Quality metric validation

3. Search Tools:

• search_content - Content search accuracy
• semantic_search - Semantic search relevance
• pattern_search - Pattern matching validation
• search_by_pattern - Advanced pattern search

4. Workflow Tools:

• batch_analysis - Batch processing validation
• workflow_guidance - Guidance accuracy
• optimization_suggestions - Suggestion quality
• generate_report - Report generation completeness

Testing Requirements:

1. Parameter Validation Testing:

• Required parameter enforcement
• Optional parameter handling
• Parameter type validation
• Parameter range validation
• Invalid parameter error handling

2. Error Condition Testing:

• File not found scenarios
• Permission denied handling
• Invalid path handling
• Timeout scenarios
• Resource exhaustion handling

3. Response Format Validation:

• JSON schema validation
• Response completeness checking
• Data type consistency
• Error response format validation
• Performance metric validation

4. Integration Testing:

• Tool chain integration
• Concurrent request handling
• Resource cleanup validation
• Memory usage tracking
• Performance regression testing

5. Real-World Scenario Testing:

• Large repository handling
• Multi-language projects
• Complex dependency graphs
• Performance under load
• Error recovery scenarios

Implementation:

• Expand tests/mcp_tools/comprehensive_mcp_tests.rs
• Add test data generation
• Implement validation frameworks
• Create performance benchmarking

Acceptance Criteria:

• All 18+ MCP tools comprehensively tested
• Parameter validation complete for all tools
• Error handling validated
• Response format validation implemented
• 300+ comprehensive test cases added
• Performance benchmarking functional

Estimated Timeline: 2 weeks

[milliondreams]

🔧 Comprehensive MCP Tool End-to-End Testing - Solution Approach

Current State Analysis

The existing provides basic infrastructure but has significant gaps:

• Only simulated tool calls (not real end-to-end testing)
• Basic parameter validation (~50 test cases vs required 300+)
• No real response format validation
• No performance benchmarking
• No error condition testing
• No real-world scenario coverage

Implementation Strategy (4 Phases)

Phase 1: Real Tool Integration Foundation

1. Real MCP Server Integration

   • Replace simulated calls with actual MCP server communication
   • Add server lifecycle management for tests
   • Implement tool call result parsing and validation

2. Enhanced Test Framework

   • Comprehensive parameter validation schemas
   • Response format validation with JSON schemas
   • Error condition testing framework
   • Performance measurement infrastructure

Phase 2: Comprehensive Parameter & Error Testing

1. Parameter Validation Testing (18+ tools)

   • Required parameter enforcement (50+ test cases)
   • Optional parameter handling (40+ test cases)
   • Type validation (60+ test cases)
   • Range/value validation (30+ test cases)
   • Invalid parameter error handling (50+ test cases)

2. Error Condition Testing

   • File not found scenarios
   • Permission denied handling
   • Invalid path/symbol handling
   • Timeout scenarios
   • Resource exhaustion handling

Phase 3: Response Format & Integration Testing

1. Response Validation

   • JSON schema validation for all tool responses
   • Data type consistency checking
   • Completeness verification
   • Error response format validation

2. Integration Testing

   • Tool chain integration tests
   • Concurrent request handling
   • Resource cleanup validation
   • Memory usage tracking

Phase 4: Real-World Scenarios & Performance

1. Scenario Testing

   • Large repository handling (1000+ files)
   • Multi-language projects
   • Complex dependency graphs
   • Performance under load testing

2. Performance Benchmarking

   • Response time tracking
   • Memory usage analysis
   • Regression detection
   • Performance threshold validation

Implementation Details

Test Coverage Expansion:

• Core Navigation (5 tools): 60+ test cases each
• Analysis Tools (8 tools): 50+ test cases each
• Search Tools (4 tools): 40+ test cases each
• Workflow Tools (3+ tools): 30+ test cases each
• Total: 300+ comprehensive test cases

Validation Framework:

• Parameter schema validation
• Response format validation
• Error handling verification
• Performance benchmarking
• Memory leak detection

This approach will create a production-ready test suite covering all MCP tools with comprehensive validation, error handling, and performance testing.