def test_close_can_be_called(self):
test_zaxis = PhotoZAxis(0.0, )
test_zaxis.start()
self.assertEquals(0.0, test_zaxis.current_z_location_mm())
test_zaxis.close()
def test_start_should_advance(self):
test_zaxis = PhotoZAxis(0.0, )
test_zaxis.start()
self.assertEquals(0.0, test_zaxis.current_z_location_mm())
