Some more porting to HomeserverTestCase and remove old RESTHelper (#4913)

4 files changed, 123 insertions, 230 deletions

diff --git a/tests/handlers/test_register.py b/tests/handlers/test_register.py
index 2217eb2a10..017ea0385e 100644
--- a/tests/handlers/test_register.py
+++ b/tests/handlers/test_register.py
@@ -22,8 +22,6 @@ from synapse.api.errors import ResourceLimitError, SynapseError
 from synapse.handlers.register import RegistrationHandler
 from synapse.types import RoomAlias, UserID, create_requester
 
-from tests.utils import default_config, setup_test_homeserver
-
 from .. import unittest
 
 
@@ -32,26 +30,23 @@ class RegistrationHandlers(object):
         self.registration_handler = RegistrationHandler(hs)
 
 
-class RegistrationTestCase(unittest.TestCase):
+class RegistrationTestCase(unittest.HomeserverTestCase):
     """ Tests the RegistrationHandler. """
 
-    @defer.inlineCallbacks
-    def setUp(self):
-        self.mock_distributor = Mock()
-        self.mock_distributor.declare("registered_user")
-        self.mock_captcha_client = Mock()
-
-        hs_config = default_config("test")
+    def make_homeserver(self, reactor, clock):
+        hs_config = self.default_config("test")
 
         # some of the tests rely on us having a user consent version
         hs_config.user_consent_version = "test_consent_version"
         hs_config.max_mau_value = 50
 
-        self.hs = yield setup_test_homeserver(
-            self.addCleanup,
-            config=hs_config,
-            expire_access_token=True,
-        )
+        hs = self.setup_test_homeserver(config=hs_config, expire_access_token=True)
+        return hs
+
+    def prepare(self, reactor, clock, hs):
+        self.mock_distributor = Mock()
+        self.mock_distributor.declare("registered_user")
+        self.mock_captcha_client = Mock()
         self.macaroon_generator = Mock(
             generate_access_token=Mock(return_value='secret')
         )
@@ -63,136 +58,133 @@ class RegistrationTestCase(unittest.TestCase):
 
         self.requester = create_requester("@requester:test")
 
-    @defer.inlineCallbacks
     def test_user_is_created_and_logged_in_if_doesnt_exist(self):
         frank = UserID.from_string("@frank:test")
         user_id = frank.to_string()
         requester = create_requester(user_id)
-        result_user_id, result_token = yield self.handler.get_or_create_user(
-            requester, frank.localpart, "Frankie"
+        result_user_id, result_token = self.get_success(
+            self.handler.get_or_create_user(requester, frank.localpart, "Frankie")
         )
         self.assertEquals(result_user_id, user_id)
         self.assertTrue(result_token is not None)
         self.assertEquals(result_token, 'secret')
 
-    @defer.inlineCallbacks
     def test_if_user_exists(self):
         store = self.hs.get_datastore()
         frank = UserID.from_string("@frank:test")
-        yield store.register(
-            user_id=frank.to_string(),
-            token="jkv;g498752-43gj['eamb!-5",
-            password_hash=None,
+        self.get_success(
+            store.register(
+                user_id=frank.to_string(),
+                token="jkv;g498752-43gj['eamb!-5",
+                password_hash=None,
+            )
         )
         local_part = frank.localpart
         user_id = frank.to_string()
         requester = create_requester(user_id)
-        result_user_id, result_token = yield self.handler.get_or_create_user(
-            requester, local_part, None
+        result_user_id, result_token = self.get_success(
+            self.handler.get_or_create_user(requester, local_part, None)
         )
         self.assertEquals(result_user_id, user_id)
         self.assertTrue(result_token is not None)
 
-    @defer.inlineCallbacks
     def test_mau_limits_when_disabled(self):
         self.hs.config.limit_usage_by_mau = False
         # Ensure does not throw exception
-        yield self.handler.get_or_create_user(self.requester, 'a', "display_name")
+        self.get_success(
+            self.handler.get_or_create_user(self.requester, 'a', "display_name")
+        )
 
-    @defer.inlineCallbacks
     def test_get_or_create_user_mau_not_blocked(self):
         self.hs.config.limit_usage_by_mau = True
         self.store.count_monthly_users = Mock(
             return_value=defer.succeed(self.hs.config.max_mau_value - 1)
         )
         # Ensure does not throw exception
-        yield self.handler.get_or_create_user(self.requester, 'c', "User")
+        self.get_success(self.handler.get_or_create_user(self.requester, 'c', "User"))
 
-    @defer.inlineCallbacks
     def test_get_or_create_user_mau_blocked(self):
         self.hs.config.limit_usage_by_mau = True
         self.store.get_monthly_active_count = Mock(
             return_value=defer.succeed(self.lots_of_users)
         )
-        with self.assertRaises(ResourceLimitError):
-            yield self.handler.get_or_create_user(self.requester, 'b', "display_name")
+        self.get_failure(
+            self.handler.get_or_create_user(self.requester, 'b', "display_name"),
+            ResourceLimitError,
+        )
 
         self.store.get_monthly_active_count = Mock(
             return_value=defer.succeed(self.hs.config.max_mau_value)
         )
-        with self.assertRaises(ResourceLimitError):
-            yield self.handler.get_or_create_user(self.requester, 'b', "display_name")
+        self.get_failure(
+            self.handler.get_or_create_user(self.requester, 'b', "display_name"),
+            ResourceLimitError,
+        )
 
-    @defer.inlineCallbacks
     def test_register_mau_blocked(self):
         self.hs.config.limit_usage_by_mau = True
         self.store.get_monthly_active_count = Mock(
             return_value=defer.succeed(self.lots_of_users)
         )
-        with self.assertRaises(ResourceLimitError):
-            yield self.handler.register(localpart="local_part")
+        self.get_failure(
+            self.handler.register(localpart="local_part"), ResourceLimitError
+        )
 
         self.store.get_monthly_active_count = Mock(
             return_value=defer.succeed(self.hs.config.max_mau_value)
         )
-        with self.assertRaises(ResourceLimitError):
-            yield self.handler.register(localpart="local_part")
+        self.get_failure(
+            self.handler.register(localpart="local_part"), ResourceLimitError
+        )
 
-    @defer.inlineCallbacks
     def test_auto_create_auto_join_rooms(self):
         room_alias_str = "#room:test"
         self.hs.config.auto_join_rooms = [room_alias_str]
-        res = yield self.handler.register(localpart='jeff')
-        rooms = yield self.store.get_rooms_for_user(res[0])
+        res = self.get_success(self.handler.register(localpart='jeff'))
+        rooms = self.get_success(self.store.get_rooms_for_user(res[0]))
         directory_handler = self.hs.get_handlers().directory_handler
         room_alias = RoomAlias.from_string(room_alias_str)
-        room_id = yield directory_handler.get_association(room_alias)
+        room_id = self.get_success(directory_handler.get_association(room_alias))
 
         self.assertTrue(room_id['room_id'] in rooms)
         self.assertEqual(len(rooms), 1)
 
-    @defer.inlineCallbacks
     def test_auto_create_auto_join_rooms_with_no_rooms(self):
         self.hs.config.auto_join_rooms = []
         frank = UserID.from_string("@frank:test")
-        res = yield self.handler.register(frank.localpart)
+        res = self.get_success(self.handler.register(frank.localpart))
         self.assertEqual(res[0], frank.to_string())
-        rooms = yield self.store.get_rooms_for_user(res[0])
+        rooms = self.get_success(self.store.get_rooms_for_user(res[0]))
         self.assertEqual(len(rooms), 0)
 
-    @defer.inlineCallbacks
     def test_auto_create_auto_join_where_room_is_another_domain(self):
         self.hs.config.auto_join_rooms = ["#room:another"]
         frank = UserID.from_string("@frank:test")
-        res = yield self.handler.register(frank.localpart)
+        res = self.get_success(self.handler.register(frank.localpart))
         self.assertEqual(res[0], frank.to_string())
-        rooms = yield self.store.get_rooms_for_user(res[0])
+        rooms = self.get_success(self.store.get_rooms_for_user(res[0]))
         self.assertEqual(len(rooms), 0)
 
-    @defer.inlineCallbacks
     def test_auto_create_auto_join_where_auto_create_is_false(self):
         self.hs.config.autocreate_auto_join_rooms = False
         room_alias_str = "#room:test"
         self.hs.config.auto_join_rooms = [room_alias_str]
-        res = yield self.handler.register(localpart='jeff')
-        rooms = yield self.store.get_rooms_for_user(res[0])
+        res = self.get_success(self.handler.register(localpart='jeff'))
+        rooms = self.get_success(self.store.get_rooms_for_user(res[0]))
         self.assertEqual(len(rooms), 0)
 
-    @defer.inlineCallbacks
     def test_auto_create_auto_join_rooms_when_support_user_exists(self):
         room_alias_str = "#room:test"
         self.hs.config.auto_join_rooms = [room_alias_str]
 
         self.store.is_support_user = Mock(return_value=True)
-        res = yield self.handler.register(localpart='support')
-        rooms = yield self.store.get_rooms_for_user(res[0])
+        res = self.get_success(self.handler.register(localpart='support'))
+        rooms = self.get_success(self.store.get_rooms_for_user(res[0]))
         self.assertEqual(len(rooms), 0)
         directory_handler = self.hs.get_handlers().directory_handler
         room_alias = RoomAlias.from_string(room_alias_str)
-        with self.assertRaises(SynapseError):
-            yield directory_handler.get_association(room_alias)
+        self.get_failure(directory_handler.get_association(room_alias), SynapseError)
 
-    @defer.inlineCallbacks
     def test_auto_create_auto_join_where_no_consent(self):
         """Test to ensure that the first user is not auto-joined to a room if
         they have not given general consent.
@@ -208,27 +200,27 @@ class RegistrationTestCase(unittest.TestCase):
         # (Messing with the internals of event_creation_handler is fragile
         # but can't see a better way to do this. One option could be to subclass
         # the test with custom config.)
-        event_creation_handler._block_events_without_consent_error = ("Error")
+        event_creation_handler._block_events_without_consent_error = "Error"
         event_creation_handler._consent_uri_builder = Mock()
         room_alias_str = "#room:test"
         self.hs.config.auto_join_rooms = [room_alias_str]
 
         # When:-
         #   * the user is registered and post consent actions are called
-        res = yield self.handler.register(localpart='jeff')
-        yield self.handler.post_consent_actions(res[0])
+        res = self.get_success(self.handler.register(localpart='jeff'))
+        self.get_success(self.handler.post_consent_actions(res[0]))
 
         # Then:-
         #   * Ensure that they have not been joined to the room
-        rooms = yield self.store.get_rooms_for_user(res[0])
+        rooms = self.get_success(self.store.get_rooms_for_user(res[0]))
         self.assertEqual(len(rooms), 0)
 
-    @defer.inlineCallbacks
     def test_register_support_user(self):
-        res = yield self.handler.register(localpart='user', user_type=UserTypes.SUPPORT)
+        res = self.get_success(
+            self.handler.register(localpart='user', user_type=UserTypes.SUPPORT)
+        )
         self.assertTrue(self.store.is_support_user(res[0]))
 
-    @defer.inlineCallbacks
     def test_register_not_support_user(self):
-        res = yield self.handler.register(localpart='user')
+        res = self.get_success(self.handler.register(localpart='user'))
         self.assertFalse(self.store.is_support_user(res[0]))
diff --git a/tests/rest/client/v1/utils.py b/tests/rest/client/v1/utils.py
index 9c401bf300..05b0143c42 100644
--- a/tests/rest/client/v1/utils.py
+++ b/tests/rest/client/v1/utils.py
@@ -18,136 +18,11 @@ import time
 
 import attr
 
-from twisted.internet import defer
-
 from synapse.api.constants import Membership
 
-from tests import unittest
 from tests.server import make_request, render
 
 
-class RestTestCase(unittest.TestCase):
-    """Contains extra helper functions to quickly and clearly perform a given
-    REST action, which isn't the focus of the test.
-
-    This subclass assumes there are mock_resource and auth_user_id attributes.
-    """
-
-    def __init__(self, *args, **kwargs):
-        super(RestTestCase, self).__init__(*args, **kwargs)
-        self.mock_resource = None
-        self.auth_user_id = None
-
-    @defer.inlineCallbacks
-    def create_room_as(self, room_creator, is_public=True, tok=None):
-        temp_id = self.auth_user_id
-        self.auth_user_id = room_creator
-        path = "/createRoom"
-        content = "{}"
-        if not is_public:
-            content = '{"visibility":"private"}'
-        if tok:
-            path = path + "?access_token=%s" % tok
-        (code, response) = yield self.mock_resource.trigger("POST", path, content)
-        self.assertEquals(200, code, msg=str(response))
-        self.auth_user_id = temp_id
-        defer.returnValue(response["room_id"])
-
-    @defer.inlineCallbacks
-    def invite(self, room=None, src=None, targ=None, expect_code=200, tok=None):
-        yield self.change_membership(
-            room=room,
-            src=src,
-            targ=targ,
-            tok=tok,
-            membership=Membership.INVITE,
-            expect_code=expect_code,
-        )
-
-    @defer.inlineCallbacks
-    def join(self, room=None, user=None, expect_code=200, tok=None):
-        yield self.change_membership(
-            room=room,
-            src=user,
-            targ=user,
-            tok=tok,
-            membership=Membership.JOIN,
-            expect_code=expect_code,
-        )
-
-    @defer.inlineCallbacks
-    def leave(self, room=None, user=None, expect_code=200, tok=None):
-        yield self.change_membership(
-            room=room,
-            src=user,
-            targ=user,
-            tok=tok,
-            membership=Membership.LEAVE,
-            expect_code=expect_code,
-        )
-
-    @defer.inlineCallbacks
-    def change_membership(self, room, src, targ, membership, tok=None, expect_code=200):
-        temp_id = self.auth_user_id
-        self.auth_user_id = src
-
-        path = "/rooms/%s/state/m.room.member/%s" % (room, targ)
-        if tok:
-            path = path + "?access_token=%s" % tok
-
-        data = {"membership": membership}
-
-        (code, response) = yield self.mock_resource.trigger(
-            "PUT", path, json.dumps(data)
-        )
-        self.assertEquals(
-            expect_code,
-            code,
-            msg="Expected: %d, got: %d, resp: %r" % (expect_code, code, response),
-        )
-
-        self.auth_user_id = temp_id
-
-    @defer.inlineCallbacks
-    def register(self, user_id):
-        (code, response) = yield self.mock_resource.trigger(
-            "POST",
-            "/register",
-            json.dumps(
-                {"user": user_id, "password": "test", "type": "m.login.password"}
-            ),
-        )
-        self.assertEquals(200, code, msg=response)
-        defer.returnValue(response)
-
-    @defer.inlineCallbacks
-    def send(self, room_id, body=None, txn_id=None, tok=None, expect_code=200):
-        if txn_id is None:
-            txn_id = "m%s" % (str(time.time()))
-        if body is None:
-            body = "body_text_here"
-
-        path = "/rooms/%s/send/m.room.message/%s" % (room_id, txn_id)
-        content = '{"msgtype":"m.text","body":"%s"}' % body
-        if tok:
-            path = path + "?access_token=%s" % tok
-
-        (code, response) = yield self.mock_resource.trigger("PUT", path, content)
-        self.assertEquals(expect_code, code, msg=str(response))
-
-    def assert_dict(self, required, actual):
-        """Does a partial assert of a dict.
-
-        Args:
-            required (dict): The keys and value which MUST be in 'actual'.
-            actual (dict): The test result. Extra keys will not be checked.
-        """
-        for key in required:
-            self.assertEquals(
-                required[key], actual[key], msg="%s mismatch. %s" % (key, actual)
-            )
-
-
 @attr.s
 class RestHelper(object):
     """Contains extra helper functions to quickly and clearly perform a given
diff --git a/tests/server_notices/test_resource_limits_server_notices.py b/tests/server_notices/test_resource_limits_server_notices.py
index 3bd9f1e9c1..be73e718c2 100644
--- a/tests/server_notices/test_resource_limits_server_notices.py
+++ b/tests/server_notices/test_resource_limits_server_notices.py
@@ -1,3 +1,18 @@
+# -*- coding: utf-8 -*-
+# Copyright 2018, 2019 New Vector Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 from mock import Mock
 
 from twisted.internet import defer
@@ -9,16 +24,18 @@ from synapse.server_notices.resource_limits_server_notices import (
 )
 
 from tests import unittest
-from tests.utils import default_config, setup_test_homeserver
 
 
-class TestResourceLimitsServerNotices(unittest.TestCase):
-    @defer.inlineCallbacks
-    def setUp(self):
-        hs_config = default_config(name="test")
+class TestResourceLimitsServerNotices(unittest.HomeserverTestCase):
+
+    def make_homeserver(self, reactor, clock):
+        hs_config = self.default_config("test")
         hs_config.server_notices_mxid = "@server:test"
 
-        self.hs = yield setup_test_homeserver(self.addCleanup, config=hs_config)
+        hs = self.setup_test_homeserver(config=hs_config, expire_access_token=True)
+        return hs
+
+    def prepare(self, reactor, clock, hs):
         self.server_notices_sender = self.hs.get_server_notices_sender()
 
         # relying on [1] is far from ideal, but the only case where
@@ -53,23 +70,21 @@ class TestResourceLimitsServerNotices(unittest.TestCase):
         self._rlsn._store.get_tags_for_room = Mock(return_value={})
         self.hs.config.admin_contact = "mailto:user@test.com"
 
-    @defer.inlineCallbacks
     def test_maybe_send_server_notice_to_user_flag_off(self):
         """Tests cases where the flags indicate nothing to do"""
         # test hs disabled case
         self.hs.config.hs_disabled = True
 
-        yield self._rlsn.maybe_send_server_notice_to_user(self.user_id)
+        self.get_success(self._rlsn.maybe_send_server_notice_to_user(self.user_id))
 
         self._send_notice.assert_not_called()
         # Test when mau limiting disabled
         self.hs.config.hs_disabled = False
         self.hs.limit_usage_by_mau = False
-        yield self._rlsn.maybe_send_server_notice_to_user(self.user_id)
+        self.get_success(self._rlsn.maybe_send_server_notice_to_user(self.user_id))
 
         self._send_notice.assert_not_called()
 
-    @defer.inlineCallbacks
     def test_maybe_send_server_notice_to_user_remove_blocked_notice(self):
         """Test when user has blocked notice, but should have it removed"""
 
@@ -81,13 +96,14 @@ class TestResourceLimitsServerNotices(unittest.TestCase):
             return_value=defer.succeed({"123": mock_event})
         )
 
-        yield self._rlsn.maybe_send_server_notice_to_user(self.user_id)
+        self.get_success(self._rlsn.maybe_send_server_notice_to_user(self.user_id))
         # Would be better to check the content, but once == remove blocking event
         self._send_notice.assert_called_once()
 
-    @defer.inlineCallbacks
     def test_maybe_send_server_notice_to_user_remove_blocked_notice_noop(self):
-        """Test when user has blocked notice, but notice ought to be there (NOOP)"""
+        """
+        Test when user has blocked notice, but notice ought to be there (NOOP)
+        """
         self._rlsn._auth.check_auth_blocking = Mock(
             side_effect=ResourceLimitError(403, 'foo')
         )
@@ -98,52 +114,49 @@ class TestResourceLimitsServerNotices(unittest.TestCase):
         self._rlsn._store.get_events = Mock(
             return_value=defer.succeed({"123": mock_event})
         )
-        yield self._rlsn.maybe_send_server_notice_to_user(self.user_id)
+        self.get_success(self._rlsn.maybe_send_server_notice_to_user(self.user_id))
 
         self._send_notice.assert_not_called()
 
-    @defer.inlineCallbacks
     def test_maybe_send_server_notice_to_user_add_blocked_notice(self):
-        """Test when user does not have blocked notice, but should have one"""
+        """
+        Test when user does not have blocked notice, but should have one
+        """
 
         self._rlsn._auth.check_auth_blocking = Mock(
             side_effect=ResourceLimitError(403, 'foo')
         )
-        yield self._rlsn.maybe_send_server_notice_to_user(self.user_id)
+        self.get_success(self._rlsn.maybe_send_server_notice_to_user(self.user_id))
 
         # Would be better to check contents, but 2 calls == set blocking event
         self.assertTrue(self._send_notice.call_count == 2)
 
-    @defer.inlineCallbacks
     def test_maybe_send_server_notice_to_user_add_blocked_notice_noop(self):
-        """Test when user does not have blocked notice, nor should they (NOOP)"""
-
+        """
+        Test when user does not have blocked notice, nor should they (NOOP)
+        """
         self._rlsn._auth.check_auth_blocking = Mock()
 
-        yield self._rlsn.maybe_send_server_notice_to_user(self.user_id)
+        self.get_success(self._rlsn.maybe_send_server_notice_to_user(self.user_id))
 
         self._send_notice.assert_not_called()
 
-    @defer.inlineCallbacks
     def test_maybe_send_server_notice_to_user_not_in_mau_cohort(self):
-
-        """Test when user is not part of the MAU cohort - this should not ever
+        """
+        Test when user is not part of the MAU cohort - this should not ever
         happen - but ...
         """
-
         self._rlsn._auth.check_auth_blocking = Mock()
         self._rlsn._store.user_last_seen_monthly_active = Mock(
             return_value=defer.succeed(None)
         )
-        yield self._rlsn.maybe_send_server_notice_to_user(self.user_id)
+        self.get_success(self._rlsn.maybe_send_server_notice_to_user(self.user_id))
 
         self._send_notice.assert_not_called()
 
 
-class TestResourceLimitsServerNoticesWithRealRooms(unittest.TestCase):
-    @defer.inlineCallbacks
-    def setUp(self):
-        self.hs = yield setup_test_homeserver(self.addCleanup)
+class TestResourceLimitsServerNoticesWithRealRooms(unittest.HomeserverTestCase):
+    def prepare(self, reactor, clock, hs):
         self.store = self.hs.get_datastore()
         self.server_notices_sender = self.hs.get_server_notices_sender()
         self.server_notices_manager = self.hs.get_server_notices_manager()
@@ -168,26 +181,27 @@ class TestResourceLimitsServerNoticesWithRealRooms(unittest.TestCase):
 
         self.hs.config.admin_contact = "mailto:user@test.com"
 
-    @defer.inlineCallbacks
     def test_server_notice_only_sent_once(self):
         self.store.get_monthly_active_count = Mock(return_value=1000)
 
         self.store.user_last_seen_monthly_active = Mock(return_value=1000)
 
         # Call the function multiple times to ensure we only send the notice once
-        yield self._rlsn.maybe_send_server_notice_to_user(self.user_id)
-        yield self._rlsn.maybe_send_server_notice_to_user(self.user_id)
-        yield self._rlsn.maybe_send_server_notice_to_user(self.user_id)
+        self.get_success(self._rlsn.maybe_send_server_notice_to_user(self.user_id))
+        self.get_success(self._rlsn.maybe_send_server_notice_to_user(self.user_id))
+        self.get_success(self._rlsn.maybe_send_server_notice_to_user(self.user_id))
 
         # Now lets get the last load of messages in the service notice room and
         # check that there is only one server notice
-        room_id = yield self.server_notices_manager.get_notice_room_for_user(
-            self.user_id
+        room_id = self.get_success(
+            self.server_notices_manager.get_notice_room_for_user(self.user_id)
         )
 
-        token = yield self.event_source.get_current_token()
-        events, _ = yield self.store.get_recent_events_for_room(
-            room_id, limit=100, end_token=token.room_key
+        token = self.get_success(self.event_source.get_current_token())
+        events, _ = self.get_success(
+            self.store.get_recent_events_for_room(
+                room_id, limit=100, end_token=token.room_key
+            )
         )
 
         count = 0
diff --git a/tests/unittest.py b/tests/unittest.py
index 7772a47078..27403de908 100644
--- a/tests/unittest.py
+++ b/tests/unittest.py
@@ -314,6 +314,9 @@ class HomeserverTestCase(TestCase):
         """
         kwargs = dict(kwargs)
         kwargs.update(self._hs_args)
+        if "config" not in kwargs:
+            config = self.default_config()
+            kwargs["config"] = config
         hs = setup_test_homeserver(self.addCleanup, *args, **kwargs)
         stor = hs.get_datastore()
 
@@ -336,6 +339,15 @@ class HomeserverTestCase(TestCase):
         self.pump(by=by)
         return self.successResultOf(d)
 
+    def get_failure(self, d, exc):
+        """
+        Run a Deferred and get a Failure from it. The failure must be of the type `exc`.
+        """
+        if not isinstance(d, Deferred):
+            return d
+        self.pump()
+        return self.failureResultOf(d, exc)
+
     def register_user(self, username, password, admin=False):
         """
         Register a user. Requires the Admin API be registered.