def test_resume_update(self):
a, b, c = Mobject(), Mobject(), Mobject()
a.add(b)
a.updating_suspended = True
b.updating_suspended = True
c.updating_suspended = False
a.resume_updating()
c.resume_updating()
self.assertFalse(a.updating_suspended)
self.assertFalse(b.updating_suspended)
self.assertFalse(c.updating_suspended)
def test_add_returns_self(self):
obj = Mobject()
self.assertEqual(obj, obj.add())
def test_add_self_fails(self):
obj = Mobject()
with self.assertRaises(Exception):
obj.add(obj)
