def test_add_subset_reparents_subset(self):
        s = Subset(None)
        self.data.add_subset(s)
        assert s.data is self.data
add_subset method updates subset.data reference
dataset/ETHPy150Open glue-viz/glue/glue/core/tests/test_data.py/TestData.test_add_subset_reparents_subset