diff --git a/tests/timer_tests.py b/tests/timer_tests.py
new file mode 100644
index 0000000..ad00232
--- /dev/null
+++ b/tests/timer_tests.py
@@ -0,0 +1,26 @@
+"""
+Copyright 2020 The Magma Authors.
+
+This source code is licensed under the BSD-style license found in the
+LICENSE file in the root directory of this source tree.
+
+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.
+"""
+
+# pylint: disable=protected-access
+from unittest import TestCase
+
+from state_machines.timer import StateMachineTimer
+
+
+class StateMachineTimerTests(TestCase):
+    def test_is_done(self):
+        timer_a = StateMachineTimer(0)
+        self.assertTrue(timer_a.is_done(), 'Timer should be done')
+
+        timer_b = StateMachineTimer(600)
+        self.assertFalse(timer_b.is_done(), 'Timer should not be done')