jamie-bitflight/python3-tdd
plugins/python-engineering/skills/python3-tdd/SKILL.md
Guides test-driven development for Python using a five-phase red-green-refactor cycle. Use when asked to write tests first, apply TDD, do test-first implementation, or follow red-green-refactor — designs typed interfaces and Protocol classes, writes failing pytest tests (RED), implements minimal passing code (GREEN), verifies with prek or ruff plus pytest-cov, and enforces a quality gate requiring all tests pass with no lint or type errors and coverage at or above 80 percent.
$ install --global
skillsauthnpx skillsauth add jamie-bitflight/claude_skills python3-tddInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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TrivyContainer and dependency vulnerability scanner
95%
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95%
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mcp-scan (Snyk)Model Context Protocol security validation
95%
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50%
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Last scanned: Apr 22, 2026, 7:57 PM75.9s1 file scanned
SKILL.md
- name:
- python3-tdd
- description:
- Guides test-driven development for Python using a five-phase red-green-refactor cycle. Use when asked to write tests first, apply TDD, do test-first implementation, or follow red-green-refactor — designs typed interfaces and Protocol classes, writes failing pytest tests (RED), implements minimal passing code (GREEN), verifies with prek or ruff plus pytest-cov, and enforces a quality gate requiring all tests pass with no lint or type errors and coverage at or above 80 percent.
- argument-hint:
- <feature-description>
- user-invocable:
- true
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-typingwhen boundary types or models are involved
2. Write Failing Tests
- Load
python3-testingfor 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 -vafter each change - Refactor only while tests stay green
4. Verify
# Linting, formatting, and type checking
uv run prek run --files src/ tests/
# Fallback when no .pre-commit-config.yaml:
# uv run ruff check src/ tests/
# uv run ruff format --check 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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