DevDox AI Locust

AI-powered Locust load test generator from API documentation

DevDox AI Locust automatically generates comprehensive Locust load testing scripts from your API documentation (OpenAPI/Swagger specs). Using advanced AI capabilities, it creates realistic test scenarios, handles complex authentication flows, and generates production-ready performance tests.

[0.1.9] - 2025-11-19

🆕 What's New in 0.1.9

✨ User Class Templates & Jinja-Based Generator Rendering :

• Added dedicated Jinja templates for user class generation.
• Refactored the generator to render user classes exclusively through template files.
• Improved maintainability and consistency across all generated resources.

✨ Features

• 🤖 AI-Enhanced Generation: Uses Together AI to create intelligent, realistic load test scenarios
• 📚 OpenAPI/Swagger Support: Automatically parses OpenAPI 3.0 and Swagger 2.0 specifications
• 🔧 Production-Ready Code: Generates clean, maintainable Locust test files
• 🎯 Smart Test Scenarios: Creates CRUD workflows, authentication flows, and error handling
• 📊 Realistic Data: Generates appropriate test data using Faker
• 🛠️ Template-Based: Highly customizable Jinja2 templates for different testing needs
• 🔄 Hybrid Approach: Combines rule-based generation with AI enhancement
• 📈 Comprehensive Coverage: Handles various HTTP methods, content types, and response scenarios
• ⚡ Asynchronous Processing: Fast, non-blocking test generation with async/await

🚀 Quick Start

Installation

# Install from PyPI (when published)
pip install devdox-ai-locust

# Or install from source
git clone https://github.com/montymobile1/devdox-ai-locust.git
cd devdox-ai-locust
pip install -e .

Prerequisites

1. Python 3.12+ - Required for modern async/await syntax and type hints
2. Together AI API Key - For AI-enhanced generation capabilities

Configuration

1. Get your Together AI API key from Together AI
2. Set up your environment:

# Copy example environment file
cp .env.example .env

# Edit .env and add your API key
echo "API_KEY=your_together_ai_api_key_here" > .env

Basic Usage

# Generate from OpenAPI URL
devdox_ai_locust generate --openapi-url https://api.example.com/openapi.json --output ./tests

# Generate with custom configuration
devdox_ai_locust generate \
   https://petstore3.swagger.io/api/v3/openapi.json \
  --output ./petstore-tests \
  --together-api-key your_api_key \
  
 # Generate with db integration 
devdox_ai_locust generate \
  https://petstore3.swagger.io/api/v3/openapi.json \
  --output ./petstore-tests \
  --db-type mongo \

🚀 Installation with Inputs

Add this step to your GitHub Actions workflow:

- name: DevDox Locust Test Generator
  uses: montymobile1/devdox-ai-locust@v0.1.6
  with:
    swagger_url: "https://portal-api.devdox.ai/openapi.json"
    output: "generated_tests"
    users: "15"
    spawn_rate: "3"
    run_time: "10m"
    together_api_key: ${{ secrets.TOGETHER_API_KEY }}


## 📖 Documentation

### Command Line Interface

```bash
devdox_ai_locust generate [OPTIONS] SWAGGER_URL

Option	Short	Type	Description	Default
--output	-o	Path	Output directory for generated tests	output
--users	-u	Integer	Number of simulated users	10
--spawn-rate	-r	Float	User spawn rate (users/second)	2
--run-time	-t	String	Test duration (e.g., 5m, 1h)	5m
--host	-H	String	Target host URL	None
--auth/--no-auth		Boolean	Include authentication	True
--dry-run		Flag	Generate without running	False
--custom-requirement		String	Custom AI instructions	None
--together-api-key		String	Together AI API key	From env

Generated Test Structure

locust_tests/
├── locust.py              # Main Locust test file
├── config.py              # Test configuration
├── test_data.py           # Test data generators
├── utils.py               # Utility functions
├── requirements.txt       # Python dependencies
├── .env.example          # Environment variables template
├── README.md             # Test documentation
├── workflows/
│   ├── user_workflow.py   # User-related test scenarios
│   ├── auth_workflow.py   # Authentication workflows
│   └── crud_workflow.py   # CRUD operation workflows
└── data/
    ├── users.json         # Sample user data
    └── test_cases.json    # Predefined test cases

🔧 Advanced Usage

Custom Templates

Create custom Jinja2 templates for specialized test generation:

# custom_template.py.j2
from locust import HttpUser, task, between

class {{ class_name }}User(HttpUser):
    wait_time = between(1, 3)
    
    def on_start(self):
        """Setup method called before tasks"""
        self.token = self.login()
    
    {% for endpoint in endpoints %}
    @task({{ endpoint.weight | default(1) }})
    def {{ endpoint.method_name }}(self):
        """{{ endpoint.description }}"""
        # Custom task implementation
        {{ endpoint.ai_generated_code | indent(8) }}
    {% endfor %}

Programmatic Usage

from devdox_ai_locust import HybridLocustGenerator
from devdox_ai_locust.config import Settings

# Initialize generator
config = Settings()
generator = HybridLocustGenerator(config)

# Generate from OpenAPI spec
async def generate_tests():
    files, workflows = await generator.generate_from_url(
        "https://api.example.com/openapi.json",
        output_dir="./tests",
        ai_enhanced=True
    )
    
    print(f"Generated {len(files)} test files")
    print(f"Created {len(workflows)} workflows")

# Run generation
import asyncio
asyncio.run(generate_tests())

🧪 Development

Setup Development Environment

# Clone repository
git clone https://github.com/montymobile1/devdox-ai-locust.git
cd devdox-ai-locust

# Create virtual environment
python -m venv venv
source venv/bin/activate  # On Windows: venv\Scripts\activate

# Install in development mode
pip install -e ".[dev,test,ai]"

# Install pre-commit hooks
pre-commit install

Running Tests

# Use the test runner script
coverage run -m pytest tests/

Project Structure

src/devdox_ai_locust/
├── __init__.py
├── cli.py                      # Command line interface
├── config.py                   # Configuration management
├── locust_generator.py         # Basic test generation
├── hybrid_loctus_generator.py  # AI-enhanced generation
├── templates/                  # Jinja2 templates
│   ├── locust.py.j2
│   ├── config.py.j2
│   └── workflow.py.j2
├── schemas/                    # Data models and validation
│   ├── processing_result.py
│   └── endpoint_schema.py
├── utils/                      # Utility modules
│   ├── swagger_utils.py
│   ├── open_ai_parser.py
│   └── file_creation.py
└── prompt/                     # AI prompt templates
    ├── system_prompts.py
    └── enhancement_prompts.py

Development Workflow

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing-feature)
3. Make your changes
4. Add tests for new functionality
5. Run the test suite (make test)
6. Commit your changes (git commit -m 'Add amazing feature')
7. Push to the branch (git push origin feature/amazing-feature)
8. Open a Pull Request

Code Standards

• Python 3.12+ with type hints
• Black for code formatting
• isort for import sorting
• pytest for testing
• mypy for type checking
• Pre-commit hooks for quality gates

📋 Requirements

System Requirements

• Python: 3.12 or higher
• Memory: 512MB RAM minimum, 1GB recommended
• Storage: 100MB for installation, additional space for generated tests

Dependencies

Core Dependencies

• locust - Load testing framework
• click - CLI framework
• pyyaml - YAML parsing
• requests - HTTP client
• pydantic - Data validation
• jinja2 - Template engine
• rich - Rich text output
• faker - Test data generation

AI Dependencies

• langchain-together - Together AI integration
• together - Together AI Python client

Development Dependencies

• pytest - Testing framework
• black - Code formatter
• mypy - Type checker
• pre-commit - Git hooks

🔍 Examples

Example 1: E-commerce API

# Generate tests for an e-commerce API
devdox_ai_locust generate \
   https://api.shop.example.com/v1/openapi.json \
  --output ./ecommerce-tests 

# The generator will create:
# - Product browsing scenarios
# - Shopping cart workflows  
# - Checkout and payment flows
# - User registration and login
# - Order management tests

❓ FAQ

Q: What API specification formats are supported? A: We support OpenAPI 3.0+ and Swagger 2.0 specifications in JSON and YAML formats.

Q: Do I need an AI API key? A: Yes, for AI-enhanced generation you need a Together AI API key. Basic generation works without AI.

Q: Can I customize the generated test templates? A: Absolutely! You can provide custom Jinja2 templates using the --template-dir option.

Q: How do I handle authentication in generated tests? A: The generator automatically detects authentication schemes from your OpenAPI spec and creates appropriate test flows.

Q: Can I run tests against different environments? A: Yes, use environment variables or configuration files to specify different target hosts and settings.

Q: What if my API has complex business logic? A: The AI enhancement feature analyzes your API patterns and generates realistic business workflows, not just individual endpoint tests.

🐛 Troubleshooting

Common Issues

Import Errors

# Ensure proper installation
pip install -e .

# Check Python path
python -c "import devdox_ai_locust; print('OK')"

API Key Issues

# Verify API key is set
echo $API_KEY

# Test API connectivity
python -c "from together import Together; print(Together(api_key='your_key').models.list())"

Template Errors

# Validate your OpenAPI spec
# Use online validators like swagger.io/tools/swagger-editor/

# Check template syntax
# Ensure custom templates use valid Jinja2 syntax

📄 License

This project is licensed under the Apache License 2.0 - see the LICENSE file for details.

🙏 Acknowledgments

• Locust - The amazing load testing framework that powers our generated tests
• Together AI - Providing the AI capabilities for intelligent test generation
• OpenAPI Initiative - For standardizing API documentation
• Python Community - For the excellent libraries and tools

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Made with ❤️ by the DevDox team

Transform your API documentation into powerful load tests with the magic of AI! 🚀