Writing Tests to test FastAPI Todo App – Fullstack Todo App Series

As part of our Fullstack Todo App Series, we are focusing on writing tests to test our FastAPI Todo App. Testing is an essential part of the development process as it helps ensure that our application works as expected and catches any bugs or issues before going live.

Setting up Testing Environment

Before we start writing tests, we need to set up our testing environment. We will be using pytest as our testing framework for our FastAPI Todo App. Make sure to install pytest by running the following command:

    pip install pytest
    

Writing Tests

Now that we have pytest installed, we can start writing tests for our FastAPI Todo App. We will create a new file called test_todo.py and add our test cases in this file. Here is an example of a test case to test creating a new todo:

    import pytest
    from app.main import app
    from fastapi.testclient import TestClient
    
    client = TestClient(app)
    
    def test_create_todo():
        response = client.post("/todos/", json={"title": "Test Todo"})
        assert response.status_code == 201
        assert response.json()["title"] == "Test Todo"
    

Running Tests

To run our tests, we can simply run the following command in our terminal:

    pytest
    

Pytest will run all the test cases we have written in our test_todo.py file and provide us with the test results.

Conclusion

Writing tests for our FastAPI Todo App is crucial to ensure that our application works correctly and is free of bugs. By setting up our testing environment and writing test cases, we can confidently deploy our application knowing that it has been thoroughly tested. In the next part of our Fullstack Todo App Series, we will focus on integrating a SQL Model into our FastAPI Todo App.