Agent skill

python3-tdd

Test-driven development workflow for Python. Activates on "TDD", "write tests first", "red-green-refactor", or tasks requiring test-first implementation with pytest. Guides design-first interfaces, failing tests, and implementation to pass.

View SKILL.md on GitHub Repository
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Forks 4

Install this agent skill to your Project

npx add-skill https://github.com/Jamie-BitFlight/claude_skills/tree/main/plugins/python-engineering/skills/python3-tdd

SKILL.md

TDD Workflow

Consult python3-core for standing defaults. Load python3-testing for detailed test patterns.

Input

Task: $ARGUMENTS

Phases

1. Design Interface

  • Define function signatures with full type annotations
  • Create Protocol classes for dependencies
  • Write docstrings before implementation
  • Load python3-typing when boundary types or models are involved

2. Write Failing Tests

  • Load python3-testing for fixture patterns and test structure
  • Tests must fail initially (RED)
  • AAA pattern; behavioral naming
  • Run uv run pytest -v — confirm failures

3. Implement to Pass

  • Minimal code to make tests pass (GREEN)
  • Run uv run pytest -v after each change
  • Refactor only while tests stay green

4. Verify

bash
# Linting
uv run ruff check src/ tests/
uv run ruff format --check src/ tests/

# Type check — detect from hooks/CI (see python3-tools)
uv run ty check src/ tests/
# If project runs mypy: uv run mypy src/ tests/

# Tests with coverage
uv run pytest --cov=src --cov-report=term-missing

5. Quality Gate

  • All tests pass
  • No lint errors
  • No type errors
  • Coverage ≥80%
  • Shebang validated on scripts

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