How to raise a "Flask" application within testing when running autotests (Pytest)?

Question

Python

Reading the documentation, I can’t figure out how to implement it so that at the beginning of the test cycle the application is deployed and then there is testing of the REST API requests.
Usually, the application is deployed if you run the file with the following code:

from flask import redirect, send_from_directory, send_file

svc = GenericService(__name__, 'config')
app = svc.get_app()
app.add_api('./openapi/specifications.yml')


@app.app.route('/')
def home():
    return redirect('/v1')


@app.app.route('/v1/f/<path:path>')
def send_frontend(path):
    return send_from_directory('frontend', path)


@app.app.route('/f130')
def send_frontend_index():
    return send_file('frontend/index.html', None, False, None, False, 0)


def create_app():
    return app.run


# If we're running in stand alone mode, run the application
if __name__ == '__main__':
    app.run(debug=True)

I'm trying to implement the launch of autotests through Pytest. There is such an example on the network, but I don’t quite understand how to implement it within the framework of my project.

import pytest

@pytest.fixture
def app():
     app = create_app()
     return ap


def test_example(client):
    response = client.get("/")
    assert response.status_code == 200