python-testing
Write and run Python tests using pytest with fixtures, mocking, coverage, and the AAA pattern. Use when writing Python tests, creating test files, or setting up pytest configuration.
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- AutumnsGrove/Lattice
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- 2025年12月25日 17:12
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SKILL.md
来源说明 · 只读预览- name
- python-testing
- description
- Write and run Python tests using pytest with fixtures, mocking, coverage, and the AAA pattern. Use when writing Python tests, creating test files, or setting up pytest configuration.
# Python Testing Skill
## When to Activate
Activate this skill when:
- Writing Python unit tests
- Creating test files or test directories
- Setting up pytest configuration
- Working with test fixtures or mocking
- Running tests or checking coverage
## Quick Commands
```bash
# Run all tests
uv run pytest
# Run specific file
uv run pytest tests/test_auth.py
# Run with coverage
uv run pytest --cov=src --cov-report=html
# Run verbose with output
uv run pytest -v -s
# Run tests matching pattern
uv run pytest -k "test_user"
# Run last failed
uv run pytest --lf
```
## Test Structure: AAA Pattern
Follow **Arrange-Act-Assert** for clear, maintainable tests:
```python
def test_user_registration():
# Arrange - set up test data
email = "test@example.com"
password = "secure_pass123"
user_service = UserService()
# Act - execute the function
result = user_service.register(email, password)
# Assert - verify the outcome
assert result.success is True
assert result.user.email == email
```
## Directory Structure
```
project/
├── src/
│ └── myapp/
├── tests/
│ ├── conftest.py # Shared fixtures
│ ├── unit/
│ │ └── test_utils.py
│ ├── integration/
│ │ └── test_api.py
│ └── e2e/
│ └── test_workflows.py
└── pyproject.toml
```
## Fixtures (conftest.py)
```python
import pytest
from myapp import create_app
@pytest.fixture
def app():
"""Create application for testing."""
app = create_app("testing")
yield app
@pytest.fixture
def client(app):
"""Create test client."""
return app.test_client()
@pytest.fixture
def sample_user():
"""Create a sample user for testing."""
return User(email="test@example.com", username="testuser")
```
## Parametrized Tests
```python
@pytest.mark.parametrize("email,expected", [
("valid@example.com", True),
("invalid.email", False),
("special+chars@test.co.uk", True),
])
def test_email_validation(email, expected):
assert is_valid_email(email) == expected
```
## Mocking
```python
from unittest.mock import Mock, patch
def test_api_call():
mock_response = Mock()
mock_response.json.return_value = {"data": "success"}
with patch("requests.get", return_value=mock_response):
result = fetch_data("https://api.example.com")
assert result == {"data": "success"}
```
## Common Patterns
### Testing Exceptions
```python
def test_division_by_zero():
with pytest.raises(ValueError, match="Cannot divide by zero"):
divide(10, 0)
```
### Testing with Temp Files
```python
def test_file_processing(tmp_path):
test_file = tmp_path / "test.txt"
test_file.write_text("Hello World")
result = process_file(str(test_file))
assert result.word_count == 2
```
### Testing Environment Variables
```python
def test_config_from_env(monkeypatch):
monkeypatch.setenv("API_KEY", "test_key_123")
assert load_config().api_key == "test_key_123"
```
## Coverage Configuration
```toml
# pyproject.toml
[tool.pytest.ini_options]
testpaths = ["tests"]
addopts = "-v --cov=src --cov-report=term-missing"
[tool.coverage.run]
source = ["src"]
omit = ["tests/*"]
```
## Naming Conventions
- Test files: `test_*.py`
- Test functions: `test_*`
- Test classes: `Test*`
## Related Resources
See `AgentUsage/testing_python.md` for complete documentation including:
- Async testing patterns
- Integration test examples
- CI/CD integration
- Test priority guidelines
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