Mocking external services in Flask - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Flask testing client.

Flask

from flask import Flask
from flask.testing import [1]

app = Flask(__name__)

Drag options to blanks, or click blank then click option'

ATestClient

BClient

CTestRequest

DFlaskClient

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'TestClient' which is not the correct Flask test client class.

Using 'Client' which is too generic and not from flask.testing.

The correct import for Flask's test client is FlaskClient. It allows you to simulate requests to your Flask app during tests.

2fill in blank

medium

Complete the code to patch the external API call using unittest.mock.

Flask

from unittest.mock import patch

@patch('[1]')
def test_api_call(mock_get):
    pass

Drag options to blanks, or click blank then click option'

Arequests.get

Bapp.get

Cflask.get

Dexternal.get

Attempts:

3 left

💡 Hint

Common Mistakes

Patching 'flask.get' which does not exist.

Patching 'app.get' which is unrelated to HTTP calls.

To mock an external HTTP GET request, you patch requests.get because requests is the library used to make HTTP calls.

3fill in blank

hard

Fix the error in the mock setup to return a JSON response.

Flask

mock_get.return_value.[1] = lambda: {'status': 'ok'}

Drag options to blanks, or click blank then click option'

Ajson_data

Bjson

Cjson.return_value()

Djson.return_value

Attempts:

3 left

💡 Hint

Common Mistakes

Mocking 'json' as a dict instead of a callable method.

Using 'json.return_value' without calling it as a function.

The requests.get method returns a response object whose json() method returns the JSON data. So you must mock json as a lambda returning the dict.

4fill in blank

hard

Fill both blanks to create a mock response with status code 200 and JSON data.

Flask

mock_response = MagicMock()
mock_response.[1] = 200
mock_response.[2].return_value = {'message': 'success'}

Drag options to blanks, or click blank then click option'

Astatus_code

Bjson

Ccontent

Dtext

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'content' or 'text' for JSON data instead of mocking 'json' method.

Setting 'status' instead of 'status_code'.

The HTTP status code is set with status_code. The JSON data is returned by the json() method, so we mock its return_value.

5fill in blank

hard

Fill all three blanks to patch 'requests.get', create a mock response, and assert the call was made.

Flask

with patch('[1]') as mock_get:
    mock_get.return_value.[2] = 200
    response = requests.get('http://example.com')
    mock_get.[3]('http://example.com')

Drag options to blanks, or click blank then click option'

Arequests.get

Bstatus_code

Cassert_called_with

Djson

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'assert_called_once' instead of 'assert_called_with' which checks arguments.

Setting 'status' instead of 'status_code'.

You patch requests.get to mock the HTTP call. The mock response's status_code is set to 200. Finally, you assert the mock was called with the expected URL using assert_called_with.