Unit Testing with Pytest & Flask Client

🐍 FlaskLesson 14Advanced

Flask exposes an execution test client allowing unit tests to dispatch simulated web requests without needing a running server process.

1 Writing Pytest Fixtures

Python — test_app.py

import pytest
from app import app as flask_app

@pytest.fixture
def client():
    with flask_app.test_client() as test_client:
        yield test_client

def test_home_page(client):
    response = client.get("/")
    assert response.status_code == 200
    assert b"Hello, World!" in response.data

2 Code Challenge

Challenge: Add a test validation step confirming a JSON post action endpoint processes data records correctly and returns a 201 Created code.