---

name: ac-test-generator description: Generate tests for features using TDD approach. Use when creating test files, generating test cases, implementing RED phase of TDD, or scaffolding test infrastructure.

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

Copyfrom 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

Copy# 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

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

Workflow

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

TDD Integration

CopyRED   → 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.