python-testing

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Consult this skill for Python testing implementation and patterns. Use when writing unit tests, setting up test suites, implementing TDD, configuring pytest, creating fixtures, async testing, writing integration tests, mocking dependencies, parameterizing tests, setting up CI/CD testing. Do not use when evaluating test quality - use pensive:test-review instead. DO NOT use when: infrastructure test config - use leyline:pytest-config.

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Sourceathola/claude-night-market

Added on2026-03-17

NPX Install

npx skill4agent add athola/claude-night-market python-testing

SKILL.md Content

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Python Testing Hub

Testing standards for pytest configuration, fixture management, and TDD implementation.

Quick Start

Dependencies:

pip install pytest pytest-cov pytest-asyncio pytest-mock

Configuration: Add the following to

pyproject.toml

:

toml

[tool.pytest.ini_options]
testpaths = ["tests"]
addopts = "--cov=src"

Verification: Run
```
pytest
```
to confirm discovery of files matching
```
test_*.py
```
.

When To Use

Constructing unit and integration tests for Python 3.9+ projects.
Isolating external dependencies using
```
pytest-mock
```
or custom monkeypatching.
Validating asynchronous logic with
```
pytest-asyncio
```
markers and event loop management.
Configuring project-wide coverage thresholds and reporting.

When NOT To Use

Evaluating test quality - use pensive:test-review instead
Infrastructure test config - use leyline:pytest-config
Evaluating test quality - use pensive:test-review instead
Infrastructure test config - use leyline:pytest-config

Modules

This skill uses modular loading to manage the system prompt budget.

Core Implementation

See
```
modules/unit-testing.md
```
- AAA (Arrange-Act-Assert) pattern, basic test structure, and exception validation.
See
```
modules/fixtures-and-mocking.md
```
- Request-scoped fixtures, parameterization, and boundary mocking.
See
```
modules/async-testing.md
```
- Coroutine testing, async fixtures, and concurrency validation.

Infrastructure & Workflow

See
```
modules/test-infrastructure.md
```
- Directory standards,
```
conftest.py
```
management, and coverage tools.
See
```
modules/testing-workflows.md
```
- Local execution patterns and GitHub Actions integration.

Standards

See
```
modules/test-quality.md
```
- Identification of common anti-patterns like broad exception catching or shared state between tests.

Exit Criteria

Tests implement the AAA pattern.
Coverage reaches the 80% project minimum.
Individual tests are independent and do not rely on execution order.
Fixtures are scoped appropriately (function, class, or session) to prevent side effects.
Mocking is restricted to external system boundaries.

Troubleshooting

Test Discovery: Verify filenames match the
```
test_*.py
```
pattern. Use
```
pytest --collect-only
```
to debug discovery paths.
Import Errors: Ensure the local source directory is in the path, typically by installing in editable mode with
```
pip install -e .
```
.
Async Failures: Confirm that
```
pytest-asyncio
```
is installed and that async tests use the
```
@pytest.mark.asyncio
```
decorator or corresponding auto-mode configuration.