Testing the API endpoints

FastAPI uses the pytest framework to run its test classes. So, before we create our test classes, first, we need to install the pytest framework using the pip command:

pip install pytest

FastAPI has a module called fastapi.testclient where all components are Request-based, including the TestClient class. To access all the API endpoints, we need the TestClient object. But first, we need to create a folder such as test, which will contain test modules where we implement our test methods. We place our test methods outside main.py or the router modules to maintain clean code and organization.

Writing the unit test cases

It is a best practice to write one test module per router component, except for cases where there is a tight connection between these routers. We place these test modules inside the test directory. To pursue the automated testing, we need to import the APIRouter instance or the FastAPI instance into the test module to set up TestClient...