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python3-tdd

Use when a Python task explicitly requires test-driven development, tests-first implementation, or a red-green-refactor workflow.

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Jamie-BitFlight/claude_skills
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SKILL.md (original)

Review the instructions the agent will receive before you install.

TDD Workflow

Consult standards-for-python-development for the shared rules. Load python3-testing for detailed test patterns.

Input

Task: $ARGUMENTS

Phases

1. Design Interface

  • Define only the interface needed to express the behavior under test
  • Preserve the project's existing architecture and typing conventions
  • 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 the smallest relevant pytest target and confirm RED
  • Record the expected failure reason before running it; RED is valid only when the observed failure demonstrates the missing behavior. A syntax/import/fixture failure or a test that already passes does not establish the requirement.

3. Implement to Pass

  • Minimal code to make tests pass (GREEN)
  • Run the smallest relevant pytest target after each change and compare the observed result with the expected GREEN result
  • 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
  • Changed behavior, boundaries, and regressions have appropriate tests
  • Existing project coverage gate is respected, if configured
  • Shebang validated on scripts

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