def testInstance(self):
t = Timer()
# Mock the timestamp to some fixed value
t._time = self.mock.Mock()
t._time.return_value = 100.0
# Start the timer. Elapsed should remain 0.0 before and after start
self.assertEqual(t.elapsed, 0.0)
t.start()
self.assertEqual(t.elapsed, 0.0)
# Make sure running time is 5s
t._time.return_value = 105.0
self.assertEqual(t.elapsed, 5.0)
# Stop and make sure elapsed time is 5s as well
t.stop()
self.assertEqual(t.elapsed, 5.0)
# Bump time by 5s, but make sure elapsed stays the same
t._time.return_value = 110.0
self.assertEqual(t.elapsed, 5.0)
# Re-stop the timer, which should update stop_time and elapsed to 10s
t.stop()
self.assertEqual(t.elapsed, 10.0)
