Python Falcon Testing Using Pytest

Below are the step-by-step approach for Python Falcon Testing using Pytest in Python:

Step 1: Create a Virtual Environment

We will create the virtual environment by using the following commands:

python -m venv venv
venv\Scripts\activate

File Structure

Write Test Using Pytest

We will follow all the steps as done in unittest with file structure and all things similarly. But we have to change only the test_example_resource.py code and we will write Pytest code.

myapp.py

In this code, a Falcon application is created with a single resource, HelloWorldResource, which handles GET requests to the root URL (‘/’). When the application is run directly, it is served using Waitress on host 0.0.0.0 and port 8000, allowing it to listen for incoming HTTP requests and respond with a JSON message “Hello, World!” upon receiving a GET request to the root URL. The application architecture follows Falcon’s convention of defining resources and routes within an application instance.

Python3

# myapp.py

from waitress import serve
import falcon
import json


class HelloWorldResource:
    def on_get(self, req, resp):
        """Handles GET requests"""
        message = {"message": "Hello, World!"}
        resp.text = json.dumps(message)
        resp.status = falcon.HTTP_200
        resp.content_type = falcon.MEDIA_JSON


def create_app():
    app = falcon.App()
    hello_world_resource = HelloWorldResource()
    app.add_route('/', hello_world_resource)
    return app


app = create_app()

if __name__ == '__main__':
    serve(app, host='0.0.0.0', port=8000)

test.py

In this code, a unit test module is created to test the functionality of the myapp.py module. A fixture named test_client is defined to provide a Falcon test client initialized with the application created by myapp.create_app(). The test_get_message function verifies that a GET request to the root URL (‘/’) returns the expected JSON response, ensuring the HelloWorldResource correctly handles the request and provides the message “Hello, World!”. This setup allows for automated testing of the Falcon application’s behavior.

Python3

# test_myapp.py

from falcon import testing
import pytest
import myapp


@pytest.fixture()
def test_client():
    return testing.TestClient(myapp.create_app())


def test_get_message(test_client):
    expected_response = {'message': 'Hello, World!'}
    result = test_client.simulate_get('/')
    assert result.json == expected_response

Run the Program

Run this program using the following command:

pytest -v test.py

Output: