How can I test Flask applications with mock requests?

How can I test Flask applications with mock requests?

You can use the unittest.mock library to mock requests in your Flask tests. Would you like a code example?

Yes, please provide a code example.

Here's a simple example:

from unittest.mock import patch
from flask import Flask
import unittest

app = Flask(__name__)

@app.route('/api/data')
def get_data():
    return {'key': 'value'}

class TestFlaskApp(unittest.TestCase):
    @patch('requests.get')
    def test_get_data(self, mock_get):
        mock_get.return_value.json.return_value = {'key': 'mocked_value'}
        response = app.test_client().get('/api/data')
        assert response.json == {'key': 'mocked_value'}

if __name__ == '__main__':
    unittest.main()

What does the @patch decorator do in this example?

The @patch decorator replaces the specified object (in this case, requests.get) with a mock object during the test, allowing you to simulate different responses.