testing-requirements

Testing & Quality

Use when writing tests - test structure, mocking patterns, pre-commit checks

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How to use this skill

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I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/data/testing-requirements/SKILL.md

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Testing Requirements

Use this skill when writing tests for features or fixing bugs.

Checklist

Test Structure

Mirror app/ structure in tests/ directory
Place test files in matching directory (e.g., app/features/generators/service.py → tests/app/features/generators/test_service.py)
Use test_ prefix for all test files and test functions

Testing Patterns

Use pytest.mark.asyncio decorator for async tests
Mock external dependencies (database, GPU, network, file I/O)
Use fixtures for common test setup
Avoid test interdependencies (each test should be independent)

Coverage Requirements

Cover all three paths:

Happy path - Normal execution with valid inputs
Error cases - Known failure conditions (invalid input, missing resources)
Edge cases - Boundary conditions, empty values, None handling

Example Test Structure

import pytest
from unittest.mock import Mock, patch
from app.features.generators.service import GeneratorService

@pytest.mark.asyncio
async def test_generate_image_success():
    """Test successful image generation (happy path)."""
    mock_db = Mock()
    config = GenerateConfig(prompt="test", model_id=1)

    with patch('app.cores.model_manager.load_model'):
        result = await GeneratorService.generate(config, mock_db)
        assert result.success is True

@pytest.mark.asyncio
async def test_generate_image_invalid_model():
    """Test error handling for invalid model (error case)."""
    mock_db = Mock()
    config = GenerateConfig(prompt="test", model_id=999)

    with pytest.raises(ValueError, match="Model not found"):
        await GeneratorService.generate(config, mock_db)

@pytest.mark.asyncio
async def test_generate_image_empty_prompt():
    """Test handling of empty prompt (edge case)."""
    mock_db = Mock()
    config = GenerateConfig(prompt="", model_id=1)

    with pytest.raises(ValueError, match="Prompt cannot be empty"):
        await GeneratorService.generate(config, mock_db)

Pre-Commit Checks

Before marking work complete, run all checks:

Type check modified files: uv run ty check app/path/to/modified.py tests/path/to/test.py
Lint and fix: uv run ruff check --fix app/ tests/
Format code: uv run ruff format app/ tests/
Run tests: uv run pytest -q
Verify all checks pass (pre-commit hook will block commits if they fail)

Quality Gates

All tests pass
No type errors (ty clean)
No lint errors (ruff clean)
Code is formatted (ruff format applied)
Test coverage includes happy path, error cases, and edge cases

Reference

Testing framework: pytest + pytest-asyncio
Pre-commit hook: Runs ruff format, ruff check, ty check on staged files
Coverage goal: 80%+ (SonarQube quality gate)