---
title: Backend Code Coverage Analysis
type: note
permalink: development/backend-code-coverage-analysis-1
---

# Backend Code Coverage Analysis

## Summary Statistics

**Source Code:**
- Total lines: 676 lines
  - `app.py`: 673 lines (main FastAPI application)
  - `__init__.py`: 3 lines

**Test Suite:**
- Total tests: 86 tests
- Total test code: 1,541 lines (across 6 test files)
- Test-to-code ratio: 2.28:1 (excellent)

## Test Files

1. **test_api_endpoints.py** (17 tests) - Tests main /api/analyze endpoint
2. **test_error_handling.py** (13 tests) - Tests error scenarios and exception handling
3. **test_validation.py** - Input validation tests
4. **test_health.py** - Health check endpoint tests
5. **test_r2_integration.py** - R2 storage integration tests
6. **conftest.py** (193 lines) - Comprehensive fixture setup with mocking

## Key Components Tested

### API Endpoints Coverage
- ✅ `/health` - Health check endpoint
- ✅ `/api/analyze` - Main video analysis endpoint (CMJ and Drop Jump)
- ✅ `/api/analyze-local` - Local filesystem video analysis
- ✅ Rate limiting (SlowAPI integration)
- ✅ CORS configuration

### Validation Coverage
- ✅ File format validation (MP4, AVI, MOV, MKV, FLV, WMV)
- ✅ File size limits (500MB max)
- ✅ Jump type validation (drop_jump, cmj)
- ✅ Quality preset validation (fast, balanced, accurate)
- ✅ Referer validation (security layer)

### Error Handling Coverage
- ✅ Invalid file format (422 response)
- ✅ Invalid jump type (422 response)
- ✅ File too large (422 response)
- ✅ Kinemotion processing errors (500 response)
- ✅ Generic exceptions (500 response)
- ✅ Keyboard interrupts
- ✅ File cleanup on errors
- ✅ Sequential error handling

### Integration Coverage
- ✅ R2 storage client initialization
- ✅ File upload to R2
- ✅ File download from R2
- ✅ File deletion from R2
- ✅ put_object (byte upload) to R2
- ✅ R2 error handling
- ✅ Graceful degradation without R2 credentials

## Test Quality Indicators

**Strengths:**
- Comprehensive fixture setup with realistic mock data
- Proper mocking of external dependencies (kinemotion analysis, R2 storage)
- Test environment isolation (`TESTING=true` flag)
- Both happy path and error path testing
- Edge case coverage (large files, invalid formats, sequential errors)

**Test Patterns:**
- Uses FastAPI TestClient for endpoint testing
- Mock-based testing to avoid external dependencies
- Fixture-driven test data (sample_cmj_metrics, sample_dropjump_metrics)
- Autouse fixtures for consistent test environment

## Coverage Estimation

Based on code structure analysis:

**Estimated Coverage:**
- Core endpoint logic: ~85-90% (all main paths tested)
- Validation functions: ~95% (comprehensive input validation tests)
- Error handlers: ~90% (multiple error scenarios covered)
- R2 storage client: ~75% (integration tests + error handling)
- Utility functions: ~85%

**Overall Estimated Coverage: 85-90%**

## CI/CD Integration

- GitHub Actions workflow: `.github/workflows/test.yml`
- Coverage report format: XML (uploaded to SonarQube Cloud)
- SonarQube project: `feniix_kinemotion`
- Coverage artifacts retained for 5 days

## Gaps & Recommendations

**Potential Coverage Gaps:**
1. Local video analysis endpoint (`/api/analyze-local`) - fewer tests than main endpoint
2. Edge cases in R2 storage operations
3. Concurrent request handling
4. Rate limit boundary testing (3/minute limit)
5. CORS preflight request handling

**Recommendations:**
1. Add explicit coverage threshold enforcement (e.g., `--cov-fail-under=80`)
2. Generate HTML coverage reports for detailed analysis
3. Add integration tests with real video files (small test videos)
4. Test R2 credential error scenarios more comprehensively
5. Add stress/load tests for concurrent video uploads

## Related Files

- Source: `/backend/src/kinemotion_backend/app.py`
- Tests: `/backend/tests/*.py`
- CI: `/.github/workflows/test.yml`
- Config: `/backend/pyproject.toml`
