AC Test Generator Skill

AC Test Generator

Generate test files and test cases following TDD principles.

Purpose

Implements the RED phase of TDD by generating failing tests before implementation, ensuring all features have comprehensive test coverage.

Quick Start

from scripts.test_generator import TestGenerator

generator = TestGenerator(project_dir)
tests = await generator.generate_for_feature(feature)
await generator.write_test_file(tests)

Generated Test Structure

# tests/test_auth_001.py
"""Tests for feature auth-001: User can register"""

import pytest
from app.auth import register_user

class TestUserRegistration:
    """Test suite for user registration."""

    def test_valid_registration_creates_user(self):
        """Valid registration creates user in database."""
        # Arrange
        email = "test@example.com"
        password = "SecurePass123!"

        # Act
        result = register_user(email, password)

        # Assert
        assert result.success
        assert result.user.email == email

    def test_duplicate_email_returns_error(self):
        """Duplicate email registration returns error."""
        # Arrange - create existing user
        # Act - try to register same email
        # Assert - error returned
        pass

    def test_weak_password_rejected(self):
        """Weak password is rejected with message."""
        pass

Test Types

Unit Tests

Test individual functions
Mock dependencies
Fast execution
High coverage

Integration Tests

Test component interactions
Real dependencies
Database transactions
API endpoints

E2E Tests

Full user workflows
Browser automation
Real environment
Acceptance criteria

Configuration

{
  "test_framework": "pytest",
  "coverage_target": 80,
  "test_patterns": {
    "unit": "tests/unit/",
    "integration": "tests/integration/",
    "e2e": "tests/e2e/"
  },
  "fixtures": "tests/fixtures/"
}

Workflow

Analyze: Read feature and test cases
Scaffold: Create test file structure
Generate: Write test functions
Validate: Ensure tests fail (RED)
Report: Output test locations

TDD Integration

RED   → ac-test-generator creates failing tests
GREEN → Claude implements minimum code to pass
REFACTOR → Code cleaned while tests pass

API Reference

See scripts/test_generator.py for full implementation.

Agent Skills: AC Test Generator

Install this agent skill to your local

Skill Files