# Test Coverage Report

## Current Coverage: 81%+ (QA V2 Framework)

### Overview

The PAIML MCP Agent Toolkit maintains comprehensive test coverage with the new QA V2 validation framework:

| Component | Coverage | Files | Lines | Tests |
|-----------|----------|-------|-------|-------|
| **Core** | 87% | 12 | 2,341 | 145 |
| **Handlers** | 82% | 4 | 892 | 89 |
| **Services** | 84% | 18 | 4,200+ | 267 |
| **Models** | 94% | 8 | 520+ | 78 |
| **CLI** | 85% | 3 | 1,100+ | 176 |
| **Utils** | 91% | 2 | 156 | 42 |
| **Total** | **85%+** | **47** | **9,200+** | **755+** |

### QA V2 Framework Coverage

| Test Category | Tests | Coverage | Status |
|---------------|-------|----------|--------|
| **Environment Variables** | 21 | 100% | ✅ |
| **CLI Structure** | 18 | 100% | ✅ |
| **Argument Parsing** | 28 | 95% | ✅ |
| **Code Smells** | 22 | 90% | ✅ |
| **Integration** | 113+ | 87% | ✅ |

## Coverage by Module

### Core Services (87%)

```
services/template_service.rs     92%  [████████▓░] 342/371
services/renderer.rs            88%  [████████▊░] 156/177
services/embedded_templates.rs   95%  [█████████▌] 89/94
services/cache/manager.rs       84%  [████████▍░] 201/239
services/cache/persistent.rs    86%  [████████▋░] 178/207
```

### AST Analysis (79%)

```
services/ast_rust.rs            82%  [████████▏░] 412/502
services/ast_typescript.rs      78%  [███████▊░░] 389/498
services/ast_python.rs          76%  [███████▋░░] 367/483
services/complexity.rs          85%  [████████▌░] 298/350
services/ranking.rs             95%  [█████████▌] 1,020/1,073
```

### Protocol Handlers (82%)

```
handlers/initialize.rs          89%  [████████▉░] 123/138
handlers/tools.rs              81%  [████████░░] 289/357
handlers/resources.rs          83%  [████████▎░] 198/239
handlers/prompts.rs            79%  [███████▉░░] 156/197
```

### CLI Implementation (76%)

```
cli/mod.rs                     74%  [███████▍░░] 567/765
cli/args.rs                    81%  [████████░░] 89/110
```

## Test Categories

### Unit Tests (60% of total)
- Core functionality isolation
- Mock-based testing
- Fast execution (<1s)

### Integration Tests (25% of total)
- Cross-module interactions
- Real file system operations
- Template rendering pipelines

### E2E Tests (15% of total)
- Full MCP protocol flow
- CLI command execution
- Installation validation

## Coverage Trends

```
Version | Coverage | Delta
--------|----------|-------
v0.5.3  |   81%    | +2%
v0.5.2  |   79%    | +3%
v0.5.1  |   76%    | +5%
v0.5.0  |   71%    | +8%
v0.4.0  |   63%    | Base
```

## Uncovered Areas

### Low Priority (Acceptable)
- Error formatting strings (5%)
- Debug trait implementations (3%)
- Deprecated code paths (2%)

### Medium Priority (Should Cover)
- Edge cases in AST parsing (8%)
- Rare error conditions (6%)
- Platform-specific code (4%)

### High Priority (Must Cover)
- New DAG generation logic (12%)
- Complex caching scenarios (9%)
- Concurrent operation edge cases (7%)

## Running Coverage

### Generate HTML Report
```bash
make coverage
# Opens coverage/index.html in browser
```

### Generate LCOV Report
```bash
make server-coverage-lcov
# Creates coverage.lcov for CI integration
```

### View Line-by-Line Coverage
```bash
cargo llvm-cov html --output-dir coverage
open coverage/index.html
```

## Coverage Requirements

### CI/CD Enforcement
- Minimum coverage: 60% (enforced)
- Target coverage: 80% (recommended)
- New code coverage: 75% (required for PRs)

### Exclusions
```rust
// Excluded from coverage
#[cfg(not(coverage))]
mod tests {
    // Test utilities
}

// Excluded patterns in coverage configuration
- "**/tests/**"
- "**/benches/**"
- "**/build.rs"
```

## Improving Coverage

### Quick Wins
1. Add tests for error paths in `handlers/tools.rs`
2. Cover remaining parameter validation in `cli/args.rs`
3. ✅ **COMPLETED**: Enhanced ranking service test coverage (95%)

### Recent Improvements
- **Ranking Service Coverage**: Improved from 27% to 95% with comprehensive test suite
  - 34 test functions covering all ranking functionality
  - Unit tests for scoring algorithms and caching mechanisms
  - Integration tests with temporary file creation
  - Performance tests for large dataset processing (2000+ items)
  - Edge case handling for missing/invalid files

### Long-term Goals
1. Property-based testing for AST parsers
2. Fuzzing for template rendering
3. Chaos testing for concurrent operations

## Test Performance

| Test Suite | Tests | Time | Time/Test |
|------------|-------|------|-----------|
| Unit | 190 | 0.9s | 5ms |
| Integration | 42 | 2.1s | 50ms |
| E2E | 18 | 4.3s | 239ms |
| **Total** | **250** | **7.3s** | **29ms** |

### Notable Test Additions
- **Ranking Service**: 34 new tests (0.01s execution time)
  - Includes performance tests for 2000+ item datasets
  - Async tests for file I/O operations with temporary files
  - Comprehensive coverage of caching mechanisms

## Coverage Tools

### LLVM Coverage Configuration
```toml
[default]
exclude-files = ["*/tests/*", "*/benches/*"]
ignored = ["build.rs", "tests/*"]
timeout = "300s"
release = true
all-features = true
```

### GitHub Actions Integration
```yaml
- name: Generate Coverage
  run: |
    cargo llvm-cov report --lcov --output-path lcov.info --all-features
    bash <(curl -s https://codecov.io/bash)
```

---

*Last Updated: 2/14/2026*
