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)