mock_injection_test.py

import socket
import inject_exception
import requests
from mock import patch
import nose.tools

# ...snippet

def test_api_call():
    with patch.object(requests, "get") as get_mock:
        with nose.tools.assert_raises(socket.error):
            get_mock.side_effect = socket.error
            inject_exception.call_api("http://example.com")