Agent skill
python-testing
pytest testing policies for Python projects. Use when writing or reviewing Python test code. Do NOT use for application code -- use python-patterns instead.
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/other/python-testing-cooldaemon-dotfiles
SKILL.md
Python Testing Policies
Project Structure
project/
├── mypackage/
├── tests/
│ ├── conftest.py # Shared fixtures
│ ├── test_module.py
│ └── integration/
└── pyproject.toml
Test Naming
# Pattern: test_<action>_<condition/scenario>
def test_create_user_with_valid_input(): ...
def test_create_user_raises_when_email_invalid(): ...
Fixture Policies
Scope Selection
| Scope | Use When |
|---|---|
function (default) |
Independent per test |
class |
Shared within test class |
module |
Expensive setup, tests don't mutate |
session |
DB connections, containers |
Always Use yield for Cleanup
@pytest.fixture
def db():
database = Database(":memory:")
yield database
database.close() # Cleanup guaranteed
Parametrize Policies
Use IDs for Clarity
@pytest.mark.parametrize("input,expected", [
pytest.param("hello", "HELLO", id="lowercase"),
pytest.param("", "", id="empty-string"),
])
def test_uppercase(input, expected): ...
Prefer parametrize Over Duplicate Tests
# BAD: Duplicate tests
def test_add_positive(): assert add(2, 3) == 5
def test_add_negative(): assert add(-1, -2) == -3
# GOOD: Parametrize
@pytest.mark.parametrize("a,b,expected", [(2,3,5), (-1,-2,-3)])
def test_add(a, b, expected): assert add(a, b) == expected
Coverage Targets
| Code Type | Target |
|---|---|
| Business logic | 80%+ |
| Public APIs | 90%+ |
| Generated code | Exclude |
# pyproject.toml
[tool.coverage.report]
fail_under = 80
Commands
See makefile-first skill for command execution policy.
Anti-Patterns
| Anti-Pattern | Correct Approach |
|---|---|
time.sleep() in tests |
Use mocks or async waiting |
| Shared mutable state | Isolated fixtures per test |
| Ignoring flaky tests | Fix or remove immediately |
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