Table of Contents

• Quick Start

• Detailed Patterns

• Integration with Other Skills

• Exit Criteria

• Troubleshooting

Pytest Configuration Patterns

Standardized pytest configuration and patterns for consistent testing infrastructure across Claude Night Market plugins.

When To Use

• Setting up pytest configuration and fixtures

• Configuring conftest.py patterns for test infrastructure

When NOT To Use

• Non-Python projects or projects using other test frameworks

• Simple scripts that do not need test infrastructure

Quick Start

Basic pyproject.toml Configuration

[tool.pytest.ini_options] testpaths = ["tests"] python_files = ["test_.py"] python_classes = ["Test"] python_functions = ["test_*"] addopts = [ "-v", "--cov=src", "--cov-report=term-missing", "--cov-fail-under=80", "--strict-markers", ] markers = [ "unit: marks tests as unit tests", "integration: marks tests as integration tests", "slow: marks tests as slow running", ]

[tool.coverage.run] source = ["src"] omit = ["/tests/", "/migrations/", "/pycache/"] branch = true

[tool.coverage.report] exclude_lines = [ "pragma: no cover", "def repr", "def str", "raise NotImplementedError", "if name == .main.:", "if TYPE_CHECKING:", "class .*\bProtocol\):", "@(abc\.)?abstractmethod", ] precision = 2 show_missing = true

Verification: Run pytest --collect-only to verify discovery, pytest -v --co -q for markers, and pytest --cov for coverage thresholds.

Detailed Patterns

For detailed implementation patterns, see:

• Conftest Patterns - Conftest.py templates, fixtures, test markers, and directory structure

• Git Testing Fixtures - GitRepository helper class for testing git workflows

• Mock Fixtures - Mock tool fixtures for Bash, TodoWrite, and other Claude Code tools

• CI Integration - GitHub Actions workflows and test commands for automated testing

• Module Index: See modules/README.md for module organization overview

Integration with Other Skills

This skill provides foundational patterns referenced by:

• parseltongue:python-testing

• Uses pytest configuration and fixtures

• pensive:test-review

• Uses test quality standards

• sanctum:test-*

• Uses conftest patterns and Git fixtures

Reference in your skill's frontmatter:

dependencies: [leyline:pytest-config, leyline:testing-quality-standards]

Exit Criteria

• pytest configuration standardized across plugins

• conftest.py provides reusable fixtures

• test markers defined and documented

• coverage configuration enforces quality thresholds

• CI/CD integration configured for automated testing

Troubleshooting

Common Issues

Tests not discovered Ensure test files match pattern test_*.py or *_test.py . Run pytest --collect-only to verify.

Import errors Check that the module being tested is in PYTHONPATH or install with pip install -e .

Async tests failing Install pytest-asyncio and decorate test functions with @pytest.mark.asyncio