def test_new_manager_without_window(self):
other_manager = Manager(Viewer(width=50, height=50), batch=self.batch, theme=self.theme)
# confirm that a new manager without window starts
# with no size
self.assertTrue(other_manager.width, 0)
# change the manager's window
other_manager.window = self.window
# confirm it has a size.
self.assertEqual(self.manager.width, 50)
# confirm it is in the correct position
self.assertEqual(self.manager.x, self.window.width / 2 - self.manager.width / 2)
