@Test
public void preFilterGaeKinds_validQuery_addsFilter() throws Exception {

    // given
    Query query = new Query(A_KIND);
    // when
    datastoreHelper.preFilterGaeKinds(query);
    // then
    then(query.getFilter()).isInstanceOf(Query.FilterPredicate.class);
    then(query.getFilter()).isNotNull();
}