diff --git a/tests/test_test_utils.py b/tests/test_test_utils.py
new file mode 100644
index 000000000..11c5db3cd
--- /dev/null
+++ b/tests/test_test_utils.py
@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+# Copyright 2014 OpenMarket 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 tests import unittest
+
+from tests.utils import MockClock
+
+class MockClockTestCase(unittest.TestCase):
+
+    def setUp(self):
+        self.clock = MockClock()
+
+    def test_advance_time(self):
+        start_time = self.clock.time()
+
+        self.clock.advance_time(20)
+
+        self.assertEquals(20, self.clock.time() - start_time)