# Agent Loader Comprehensive Tests Summary

## Overview

Created comprehensive unit tests for the AgentLoader functionality in `/tests/agents/test_agent_loader_comprehensive.py`.

## Test Coverage

### ✅ Completed Test Classes

1. **TestAgentLoaderCore** (6 tests)
   - ✅ test_agent_loader_initialization
   - ✅ test_get_agent
   - ✅ test_list_agents
   - ✅ test_get_agent_prompt
   - ✅ test_get_agent_metadata
   - ❌ test_metrics_collection (needs fixing)

2. **TestAgentLoaderCaching** (3 tests)
   - ✅ test_cache_key_generation
   - ❌ test_cache_ttl_behavior (needs fixing)
   - ✅ test_cache_invalidation

3. **TestAgentLoaderErrorHandling** (4 tests)
   - ✅ test_invalid_json_handling
   - ✅ test_missing_required_fields
   - ✅ test_empty_instructions_handling
   - ✅ test_file_permission_error

4. **TestDynamicModelSelection** (3 tests)
   - ✅ test_complexity_analysis_integration
   - ✅ test_model_threshold_mapping
   - ✅ test_environment_variable_overrides

5. **TestBackwardCompatibility** (2 tests)
   - ❌ test_legacy_agent_functions (needs fixing)
   - ❌ test_load_agent_prompt_from_md (needs fixing)

6. **TestUtilityFunctions** (4 tests)
   - ✅ test_list_available_agents
   - ✅ test_validate_agent_files
   - ❌ test_reload_agents (needs fixing)
   - ✅ test_get_agent_prompt_with_model_info

7. **TestPerformance** (3 tests)
   - ❌ test_multiple_agent_loading_performance (needs fixing)
   - ❌ test_cache_efficiency (needs fixing)
   - ❌ test_prompt_size_tracking (needs fixing)

8. **TestEdgeCases** (4 tests)
   - ✅ test_empty_templates_directory
   - ❌ test_very_large_prompt (needs fixing)
   - ✅ test_concurrent_access_simulation
   - ❌ test_special_characters_in_agent_id (needs fixing)

## Key Features Tested

1. **Core Methods**: All AgentLoader methods (list_agents, get_agent, get_agent_prompt, get_agent_metadata)
2. **Caching**: Cache hits/misses, invalidation, TTL behavior
3. **Error Handling**: Missing agents, invalid configurations, corrupted files
4. **Dynamic Model Selection**: Complexity analysis integration, model thresholds
5. **Performance**: Loading multiple agents, cache efficiency metrics
6. **Backward Compatibility**: Legacy function support
7. **Edge Cases**: Empty directories, large prompts, special characters

## Test Infrastructure

- Created shared fixtures in `/tests/agents/conftest.py` for:
  - `mock_agent_data`: Standardized agent data matching schema
  - `temp_agent_dir`: Temporary directory with test agent files

## Schema Compliance

Tests ensure compliance with the agent schema requiring:
- `schema_version`: "1.1.0"
- Valid `category` values: ["engineering", "research", "quality", "operations", "specialized"]
- Valid `tools` from approved list: ["Read", "Write", "Edit", "Grep", "Glob", etc.]
- Minimum instruction length requirements
- All required metadata fields

## Known Issues Fixed

1. Fixed agent_loader bug where ComplexityLevel was treated as enum with .value
2. Updated test agent data to match current schema requirements
3. Moved shared fixtures to conftest.py to avoid duplication

## Remaining Work

1. Fix failing test_metrics_collection
2. Fix cache TTL behavior test
3. Fix legacy agent functions tests
4. Fix performance tests
5. Fix edge case tests for special characters and large prompts

## Current Test Status

- **Total Tests**: 29
- **Passing**: 19
- **Failing**: 10
- **Success Rate**: 65.5%

## Documentation

All tests are well-documented with:
- Clear docstrings explaining test purpose
- Inline comments for complex logic
- WHY comments explaining design decisions
- Comprehensive error messages for debugging