- self.assertEqual(self.square1.disjoint(), self.disjoint)
- self.assertEqual(self.empty.disjoint(), Empty)
- self.assertEqual(self.universe.disjoint(), self.universe)
+ self.assertEqual(self.square1.make_disjoint(), self.disjoint)
+ self.assertEqual(self.empty.make_disjoint(), Empty)
+ self.assertEqual(self.universe.make_disjoint(), self.universe)