Book Image

Building Python Web APIs with FastAPI

By : Abdulazeez Abdulazeez Adeshina
Book Image

Building Python Web APIs with FastAPI

By: Abdulazeez Abdulazeez Adeshina

Overview of this book

RESTful web services are commonly used to create APIs for web-based applications owing to their light weight and high scalability. This book will show you how FastAPI, a high-performance web framework for building RESTful APIs in Python, allows you to build robust web APIs that are simple and intuitive and makes it easy to build quickly with very little boilerplate code. This book will help you set up a FastAPI application in no time and show you how to use FastAPI to build a REST API that receives and responds to user requests. You’ll go on to learn how to handle routing and authentication while working with databases in a FastAPI application. The book walks you through the four key areas: building and using routes for create, read, update, and delete (CRUD) operations; connecting the application to SQL and NoSQL databases; securing the application built; and deploying your application locally or to a cloud environment. By the end of this book, you’ll have developed a solid understanding of the FastAPI framework and be able to build and deploy robust REST APIs.
Table of Contents (14 chapters)
Part 1: An Introduction to FastAPI
Part 2: Building and Securing FastAPI Applications
Part 3: Testing And Deploying FastAPI Applications

Writing tests for REST API endpoints

With everything in place, let’s create the file, where we’ll test the authentication routes:

(venv)$ touch tests/

In the test file, we’ll start by importing the dependencies:

import httpx
import pytest

Testing the sign-up route

The first endpoint we’ll be testing is the sign-up endpoint. We’ll be adding the pytest.mark.asyncio decorator, which informs pytest to treat this as an async test. Let’s define the function and the request payload:

async def test_sign_new_user(default_client: httpx.AsyncClient) -> None:
    payload = {
        "email": "[email protected]",
        "password": "testpassword",

Let’s define the request header and expected response: