masto-rss/TEST_SUMMARY.md

# Test Implementation Summary

## Overview

Comprehensive test suite designed for the Masto-RSS bot with unit tests, integration tests, and automated CI/CD testing via GitHub Actions.

## Files Created

### 1. Core Refactoring
- **[bot.py](bot.py)** - Refactored core functionality into testable `MastodonRSSBot` class
  - Separated concerns (parsing, posting, state management)
  - Dependency injection for easier testing
  - Error handling and logging
  - Type hints for better code clarity

- **[main.py](main.py)** - Simplified entry point
  - Loads configuration from environment
  - Instantiates and runs the bot
  - Clean separation from core logic

### 2. Test Files

#### [test_bot.py](test_bot.py) - Unit Tests
Contains **20+ unit tests** covering:
- Bot initialization with configuration
- Loading/saving processed entries (with and without existing files)
- Directory creation for state files
- Status formatting from feed entries
- Mastodon posting (success and failure cases)
- Feed parsing (success, errors, malformed data)
- Processing new entries (all new, partially processed, no entries)
- Handling entries without URLs
- Failed posts don't get marked as processed
- Main entry point configuration loading

**Coverage:** Core business logic, edge cases, error handling

#### [test_integration.py](test_integration.py) - Integration Tests
Contains **10+ integration tests** covering:
- End-to-end RSS to Mastodon flow
- Real RSS 2.0 feed parsing
- Real Atom feed parsing
- State persistence across bot runs
- Incremental feed updates (new entries added over time)
- Network error handling (500 errors, timeouts)
- Malformed XML handling
- Different visibility levels (public, unlisted, private, direct)
- Rate limiting error handling
- Retry mechanisms

**Coverage:** Component integration, external service mocking, data flow

### 3. Configuration Files

#### [pytest.ini](pytest.ini)
- Test discovery patterns
- Coverage settings (80% minimum)
- Output formatting
- Test markers (unit, integration, slow)
- Coverage exclusions

#### [pyproject.toml](pyproject.toml)
Test dependencies (managed by `uv`):
- `pytest` - Testing framework
- `pytest-cov` - Coverage plugin
- `pytest-mock` - Mocking utilities
- `responses` - HTTP mocking for integration tests
- `flake8` - Linting
- `black` - Code formatting
- `mypy` - Type checking
- `coverage` - Coverage reporting

#### [.gitignore](.gitignore)
Updated to exclude:
- Test artifacts (`.pytest_cache/`, `htmlcov/`, `coverage.xml`)
- Python cache files
- Virtual environments
- IDE configurations

### 4. CI/CD Pipeline

#### [.github/workflows/test.yml](.github/workflows/test.yml)
Comprehensive GitHub Actions workflow with **5 jobs**:

1. **Unit Tests**
   - Runs on Python 3.10, 3.11, 3.12 (matrix)
   - Executes unit tests with coverage
   - Uploads coverage to Codecov

2. **Integration Tests**
   - Runs on Python 3.10, 3.11, 3.12 (matrix)
   - Executes integration tests
   - Uploads coverage to Codecov

3. **Code Quality**
   - Ruff linting and formatting verification
   - Mypy type checking

4. **Docker Build Test**
   - Builds Docker image
   - Verifies Python installation
   - Checks dependencies are installed

5. **All Tests Pass**
   - Requires all previous jobs to succeed
   - Provides single status check for PRs

### 5. Documentation

#### [TESTING.md](TESTING.md)
Comprehensive testing guide covering:
- Test architecture explanation
- Running tests locally (all, specific, by marker)
- Coverage report generation
- GitHub Actions CI/CD workflow details
- Test coverage requirements (80% minimum)
- Code quality standards
- Writing new tests (templates provided)
- Troubleshooting common issues
- Best practices

#### [README.md](README.md)
Updated with:
- Test status badge
- Link to testing documentation

## Test Statistics

### Coverage Targets
- **Minimum:** 80% code coverage
- **Measured:** `bot.py` and `main.py`
- **Excluded:** Test files, virtual environments

### Test Count
- **Unit Tests:** 20+ tests
- **Integration Tests:** 10+ tests
- **Total:** 30+ tests

### Python Versions Tested
- Python 3.10
- Python 3.11
- Python 3.12

## Key Testing Features

### Mocking Strategy
- **Mastodon API:** Mocked using `unittest.mock` to avoid real API calls
- **RSS Feeds:** Mocked using `responses` library with realistic XML
- **File System:** Uses temporary files that are cleaned up automatically

### Test Data
- Realistic RSS 2.0 and Atom feed examples
- Multiple entry scenarios (new, processed, malformed)
- Error conditions (network failures, API errors, rate limits)

### Continuous Integration
- Runs on every push to `main`
- Runs on all pull requests
- Parallel test execution across Python versions
- Automatic coverage reporting
- Docker image validation

## Running Tests

### Locally
```bash
# Install dependencies
pip install -r requirements-test.txt

# Run all tests
pytest

# Run with coverage
pytest --cov=bot --cov=main --cov-report=html

# Run specific tests
pytest test_bot.py  # Unit tests only
pytest test_integration.py  # Integration tests only
```

### In CI/CD
Tests run automatically via GitHub Actions:
- **Trigger:** Push to main or pull request
- **Duration:** ~5-10 minutes
- **Matrix:** 3 Python versions × 2 test types = 6 parallel jobs
- **Plus:** Code quality and Docker build validation

## Benefits

1. **Code Quality:** Ensures all changes are tested before merging
2. **Regression Prevention:** Catches bugs before they reach production
3. **Documentation:** Tests serve as executable documentation
4. **Confidence:** Safe to refactor with comprehensive test coverage
5. **Type Safety:** Mypy catches type-related bugs early
6. **Code Style:** Black and flake8 enforce consistency

## Future Enhancements

Potential additions:
- Performance/load testing
- End-to-end tests with real Mastodon test instance
- Security scanning (Bandit, Safety)
- Mutation testing (mutmut)
- Property-based testing (Hypothesis)
- Contract testing for API interactions

## Maintenance

- **Add tests** for all new features
- **Update tests** when changing behavior
- **Keep coverage above 80%**
- **Run tests before committing**
- **Review test failures** in CI before merging