Add methods for creating and deleting test users

Methods added to the FacebookTestCase for creating and deleting
test users. A list containing the test users is initialised in
the setup method. A teardown method is added to delete the test
users after running the tests requiring them.

test/test_facebook.py

@@ -25,7 +25,11 @@
 
 
 class FacebookTestCase(unittest.TestCase):
-    """Sets up application ID and secret from environment."""
+    """
+    Sets up application ID and secret from environment and initialises an
+    empty list for test users.
+
+    """
     def setUp(self):
         try:
             self.app_id = os.environ["FACEBOOK_APP_ID"]
@@ -34,6 +38,18 @@ def setUp(self):
             raise Exception("FACEBOOK_APP_ID and FACEBOOK_SECRET "
                             "must be set as environmental variables.")
 
+        self.test_users = []
+
+    def tearDown(self):
+        """Deletes the test users included in the test user list."""
+        token = facebook.GraphAPI().get_app_access_token(
+            self.app_id, self.secret)
+        graph = facebook.GraphAPI(token)
+
+        for user in self.test_users:
+            graph.request(user['id'], {}, None, method='DELETE')
+        del self.test_users[:]
+
     def assert_raises_multi_regex(
             self, expected_exception, expected_regexp, callable_obj=None,
             *args, **kwargs):
@@ -48,6 +64,26 @@ def assert_raises_multi_regex(
         except facebook.GraphAPIError as error:
             self.assertEqual(error.message, expected_regexp)
 
+    def create_test_users(self, app_id, graph, amount):
+        """Function for creating test users."""
+        for i in range(amount):
+            u = graph.request(app_id + '/accounts/test-users', {}, {},
+                              method='POST')
+            self.test_users.append(u)
+
+    def create_friend_connections(self, user, friends):
+        """Function for creating friend connections for a test user."""
+        user_graph = facebook.GraphAPI(user['access_token'])
+
+        for friend in friends:
+            if user['id'] == friend['id']:
+                continue
+            user_graph.request(user['id'] + '/friends/' + friend['id'],
+                               {}, {}, method='POST')
+            respondent_graph = facebook.GraphAPI(friend['access_token'])
+            respondent_graph.request(friend['id'] + '/friends/' + user['id'],
+                                     {}, {}, method='POST')
+
 
 class TestGetAppAccessToken(FacebookTestCase):
     """