AgentSkillsCN

python-testing-patterns

掌握pytest fixture、参数化、模拟以及测试组织模式。主动启用以下场景：(1) 编写pytest测试套件；(2) 创建fixture；(3) 实施参数化测试；(4) 模拟外部依赖；(5) 组织测试目录。触发指令包括：“pytest”“fixture”“parametrize”“mock”“Python测试”“unittest”“conftest”。

SKILL.md
--- frontmatter
name: python-testing-patterns
version: "1.0"
description: >
  Pytest fixtures, parametrization, mocking, and test organization patterns.
  PROACTIVELY activate for: (1) Writing pytest test suites, (2) Creating fixtures,
  (3) Implementing parametrized tests, (4) Mocking external dependencies, (5) Organizing test directories.
  Triggers: "pytest", "fixture", "parametrize", "mock", "python test", "unittest", "conftest"
core-integration:
  techniques:
    primary: ["exhaustive_edge_case_enumeration"]
    secondary: ["completeness_verification"]
  contracts:
    input: "none"
    output: "none"
  patterns: "none"
  rubrics: "none"

Python Testing Patterns Skill

Metadata (Tier 1)

Keywords: pytest, fixture, parametrize, mock, python test, unittest

File Patterns: test_*.py, *_test.py

Modes: testing_backend

Instructions (Tier 2)

Fixture Design

python
import pytest

@pytest.fixture
def database():
    """Create test database"""
    db = setup_database()
    yield db  # Provide to test
    teardown_database(db)  # Cleanup

def test_query(database):
    result = database.query("SELECT * FROM users")
    assert result is not None

Scopes: function (default), class, module, session

Parametrization

python
@pytest.mark.parametrize("input,expected", [
    (3, 9),
    (4, 16),
    (-2, 4),
])
def test_square(input, expected):
    assert square(input) == expected

Mocking

python
from unittest.mock import patch, MagicMock

def test_api_call():
    with patch('requests.get') as mock_get:
        mock_get.return_value.json.return_value = {'data': 'test'}

        result = fetch_data('https://api.example.com')

        assert result == {'data': 'test'}
        mock_get.assert_called_once()

Test Organization

code
tests/
├── unit/
│   ├── test_auth.py
│   └── test_models.py
├── integration/
│   └── test_api.py
└── conftest.py  # Shared fixtures

Anti-Patterns

  • •Test interdependence
  • •Mocking implementation details
  • •Not using fixtures for setup/teardown
  • •Hardcoded test data