How do I set up testing for my Flask application?

How do I set up testing for my Flask application?

To set up testing in your Flask application, you can use the built-in unittest framework or pytest. Do you have a preference?

I prefer using pytest. What are the steps?

First, install pytest with pip install pytest. Then, create a tests directory and add your test files there. You can start by creating a test file like test_app.py.

What should I include in my test file?

In your test file, import your Flask app and use pytest's fixtures to set up the test client. You can then write test functions to check your routes and responses.

Can you give me an example of a test function?

Sure! Here's a simple example:

def test_home_page(client):
    response = client.get('/')
    assert response.status_code == 200
    assert b'Welcome' in response.data

This tests if the home page loads successfully and contains the word 'Welcome'.