Introduction

FastAPI is a modern Python web framework for building APIs. Testing FastAPI endpoints is crucial for ensuring that your application behaves as expected. This article will cover the basics of testing FastAPI endpoints, including how to set up tests, common testing techniques, and common pitfalls to avoid.

Setting Up Tests

Before we dive into testing, make sure your FastAPI application has a testing setup. Typically, you'll need to run your FastAPI application in a development server (e.g., uvicorn ) and use a testing framework like pytest or unittest .

Testing Basics

Request and Response Assertions

The most basic tests involve making requests to your API and asserting that the response matches your expectations. Here's an example using pytest and uvicorn :

# test_app.py from fastapi import FastAPI import pytest

app = FastAPI ()

@app.get ( ' /hello ' ) async def hello_world () -> dict : return { ' message ' : ' Hello, world!…