def test_size_empty_set_empty(self):
b = Box([x, y, z])
self.assertEqual(b.size(), 3)
self.assertFalse(b.empty())
b.set_empty()
self.assertTrue(b.empty())
def test_copy_constructor(self):
b1 = Box([x, y, z])
b2 = Box([x, y, z])
self.assertEqual(b1, b2)
b2.set_empty()
self.assertNotEqual(b1, b2)