pytest-routes 0.4.0

Property-based smoke testing for ASGI application routes

pytest-routes

Property-based smoke testing for ASGI application routes.

Overview

pytest-routes automatically discovers routes from your ASGI application and performs randomized smoke testing using Hypothesis. It works with any ASGI framework, with first-class support for Litestar.

Key Features

• Automatic Route Discovery - Extracts routes directly from your ASGI app
• Property-Based Testing - Uses Hypothesis to generate diverse test inputs
• Framework Agnostic - Works with Litestar, FastAPI, Starlette, and any ASGI app
• Configurable - Filter routes, set examples per route, customize validation
• Zero Config - Works out of the box with sensible defaults

Installation

# With pip
pip install pytest-routes

# With uv
uv add pytest-routes

# With framework extras
uv add "pytest-routes[litestar]"
uv add "pytest-routes[fastapi]"

Quick Start

# Run smoke tests on your ASGI app
pytest --routes --routes-app myapp:app

# With options
pytest --routes --routes-app myapp:app --routes-max-examples 50

Or define your app as a fixture:

# conftest.py
import pytest
from myapp import create_app

@pytest.fixture(scope="session")
def app():
    return create_app()

pytest --routes

Configuration

CLI Options

Option	Description	Default
--routes	Enable route smoke testing	False
--routes-app	Import path to ASGI app	-
--routes-max-examples	Max Hypothesis examples per route	100
--routes-exclude	Comma-separated patterns to exclude	/health,/metrics,...
--routes-include	Comma-separated patterns to include	-
--routes-methods	HTTP methods to test	GET,POST,PUT,PATCH,DELETE
--routes-seed	Random seed for reproducibility	-

pyproject.toml

[tool.pytest-routes]
app = "myapp:app"
max_examples = 100
exclude = ["/health", "/metrics", "/docs"]
methods = ["GET", "POST"]

Supported Frameworks

Framework	Status	Notes
Litestar	First-class	Full type extraction
FastAPI	Supported	Via Starlette
Starlette	Supported	Base ASGI support

How It Works

1. Discovery - Extracts routes from your ASGI app using framework-specific extractors
2. Generation - Creates Hypothesis strategies based on route parameter types
3. Execution - Runs property-based tests against each route
4. Validation - Checks responses meet smoke test criteria (no 5xx, etc.)

Documentation

Full documentation available at jacobcoffee.github.io/pytest-routes

License

MIT License - see LICENSE