Added __init__.py and test_mock_xqueue_server.py,

which should have been included in the last commit

lms/djangoapps/courseware/mock_xqueue_server/test_mock_xqueue_server.py

+import mock
+import unittest
+import threading
+import json
+import urllib
+import urlparse
+import time
+from mock_xqueue_server import MockXQueueServer, MockXQueueRequestHandler
+
+
+class MockXQueueServerTest(unittest.TestCase):
+    '''
+    A mock version of the XQueue server that listens on a local
+    port and responds with pre-defined grade messages.
+
+    Used for lettuce BDD tests in lms/courseware/features/problems.feature
+    and lms/courseware/features/problems.py
+
+    This is temporary and will be removed when XQueue is
+    rewritten using celery.
+    '''
+
+    def setUp(self):
+
+        # Create the server
+        server_port = 8034
+        self.server_url = 'http://127.0.0.1:%d' % server_port
+        self.server = MockXQueueServer(server_port,
+                                {'correct': True, 'score': 1, 'msg': ''})
+
+        # Start the server in a separate daemon thread
+        server_thread = threading.Thread(target=self.server.serve_forever)
+        server_thread.daemon = True
+        server_thread.start()
+
+    def tearDown(self):
+
+        # Stop the server, freeing up the port
+        self.server.shutdown()
+
+    def test_grade_request(self):
+
+        # Patch post_to_url() so we can intercept
+        # outgoing POST requests from the server
+        MockXQueueRequestHandler.post_to_url = mock.Mock()
+
+        # Send a grade request
+        callback_url = 'http://127.0.0.1:8000/test_callback'
+
+        grade_header = json.dumps({'lms_callback_url': callback_url,
+                                    'lms_key': 'test_queuekey',
+                                    'queue_name': 'test_queue'})
+
+        grade_body = json.dumps({'student_info': 'test',
+                                'grader_payload': 'test',
+                                'student_response': 'test'})
+
+        grade_request = {'xqueue_header': grade_header,
+                        'xqueue_body': grade_body}
+
+        response_handle = urllib.urlopen(self.server_url + '/xqueue/submit',
+                                urllib.urlencode(grade_request))
+
+        response_dict = json.loads(response_handle.read())
+
+        # Expect that the response is success
+        self.assertEqual(response_dict['return_code'], 0)
+
+        # Wait a bit before checking that the server posted back
+        time.sleep(3)
+
+        # Expect that the server tries to post back the grading info
+        xqueue_body = json.dumps({'correct': True, 'score': 1,
+                                    'msg': '<div></div>'})
+        expected_callback_dict = {'xqueue_header': grade_header,
+                                'xqueue_body': xqueue_body}
+        MockXQueueRequestHandler.post_to_url.assert_called_with(callback_url,
+                                                        expected_callback_dict)