diff --git a/test/test_with_mock.py b/test/test_with_mock.py
index 9838ed8..ccf678a 100644
--- a/test/test_with_mock.py
+++ b/test/test_with_mock.py
@@ -14,7 +14,7 @@ def test_tracks_temperature_change(self):
 
         tracker.record_initial_temperature()
         mock_sensor.configure_mock(**{'check_temperature.return_value': 22})
-        self.assertEqual(10, tracker.find_temperature_change())
+        self.assertEqual(11, tracker.find_temperature_change())
 
 
 if __name__ == '__main__':