def test_drop_obs_column():
    adata = ad.AnnData(np.array(X_list), obs=obs_dict, dtype="int32")

    subset = adata[:2]
    assert subset.is_view
    # returns a copy of obs
    assert subset.obs.drop(columns=["oanno1"]).columns.tolist() == ["oanno2", "oanno3"]
    assert subset.is_view
    # would modify obs, so it should actualize subset and not modify adata
    subset.obs.drop(columns=["oanno1"], inplace=True)
    assert not subset.is_view
    assert subset.obs.columns.tolist() == ["oanno2", "oanno3"]

    assert adata.obs.columns.tolist() == ["oanno1", "oanno2", "oanno3"]
def test_volume_bootable(self):
        """Test setting and retrieving bootable flag of a volume"""
        for bool_bootable in [True, False]:
            self.volumes_client.set_bootable_volume(self.volume['id'],
                                                    bootable=bool_bootable)
            fetched_volume = self.volumes_client.show_volume(
                self.volume['id'])['volume']
            # Get Volume information
            # NOTE(masayukig): 'bootable' is "true" or "false" in the current
            # cinder implementation. So we need to cast boolean values to str
            # and make it lower to compare here.
            self.assertEqual(str(bool_bootable).lower(),
                             fetched_volume['bootable'])