def METHOD_NAME(self, source_app, app_storage):
    # Given a source in the DB
    create_source_user(
        db_session=db.session,
        source_passphrase=PassphraseGenerator.get_default().generate_passphrase(),
        source_app_storage=app_storage,
    )
    # When a user tries to authenticate using a wrong passphrase, it fails
    wrong_passphrase = "rehydrate flaring study raven fence extenuate linguist"
    with pytest.raises(InvalidPassphraseError):
        authenticate_source_user(db_session=db.session, supplied_passphrase=wrong_passphrase)