fastapi-tdd

Set up async TDD workflows for FastAPI with pytest-asyncio and httpx.

1|Updated Mar 10, 2026

Search Tags:#testing #tdd #pytest #fastapi #asyncio #sqlalchemy #httpx

Ready to run

npx skills add https://github.com/aleonsa/claude-config --skill fastapi-tdd

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: fastapi-tdd
Source: https://github.com/aleonsa/claude-config/tree/main/claude/skills/fastapi-tdd
Command: npx skills add https://github.com/aleonsa/claude-config --skill fastapi-tdd

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill streamlines the process of writing robust tests for FastAPI applications, ensuring code quality and reliability through Test-Driven Development (TDD).

Core Features & Use Cases

TDD Workflow: Guides you through the Red-Green-Refactor cycle specifically for FastAPI.
Async Testing: Integrates seamlessly with pytest-asyncio for testing asynchronous code.
Database & API Testing: Provides fixtures for async SQLAlchemy sessions and httpx clients for comprehensive integration testing.
Data Generation: Leverages polyfactory for creating realistic test data.
Mocking: Demonstrates effective strategies for mocking external services.
Use Case: When developing a new API endpoint in FastAPI, use this Skill to first write a failing test, then implement the endpoint to pass, and finally refactor your code while maintaining test coverage.

Quick Start

Activate this skill to set up a new FastAPI project with TDD using pytest and httpx.

Frequently Asked Questions about fastapi-tdd

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I test FastAPI endpoints using TDD with pytest?▼

Testing FastAPI endpoints using TDD involves following the Red-Green-Refactor cycle with pytest-asyncio and httpx clients to write failing tests, implement endpoints, and refactor while maintaining coverage.

How do I set up an async SQLAlchemy test database for FastAPI?▼

Setting up an async SQLAlchemy test database for FastAPI requires using pytest-asyncio fixtures to manage asynchronous database sessions, ensuring your integration tests run against an isolated async database environment.

What is the best way to mock external services in FastAPI testing?▼

Mocking external services in FastAPI testing is best handled by applying effective mocking strategies within your pytest suite to isolate endpoints and verify service interactions without making live network calls.

Can I use polyfactory to generate test data for FastAPI applications?▼

You can use polyfactory to generate realistic test data for FastAPI applications, leveraging it alongside pytest-asyncio and async SQLAlchemy fixtures to comprehensively test API endpoints and services.

Does pytest-asyncio work with httpx for FastAPI integration testing?▼

pytest-asyncio works seamlessly with httpx for FastAPI integration testing, providing the necessary fixtures to execute asynchronous test cases and validate API endpoint responses concurrently.