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_validation_for_rejected_application_with_no_message(self):
        self.assertEqual(
            self.voiceover_application.status,
            suggestion_models.STATUS_IN_REVIEW)
        self.assertEqual(self.voiceover_application.rejection_message, None)
        self.voiceover_application.validate()

        self.voiceover_application.final_reviewer_id = 'reviewer_id'
        self.voiceover_application.status = suggestion_models.STATUS_REJECTED
        with self.assertRaisesRegex(
            utils.ValidationError,
            'Expected rejection_message to be a string for a '
            'rejected application'
        ):
            self.voiceover_application.validate()