@Test
  public void testWithUnknownRegion() throws Exception {
    String queryResult =
        queryEngine.queryForJsonResult("select * from " + SEPARATOR + "unknonwn", 1, 1, 1);
    assertThat(queryResult)
        .isEqualTo("{\"message\":\"Cannot find regions " + SEPARATOR
            + "unknonwn in any of the members\"}");
  }
Tests a model where Objects have a circular reference with their class types. e.g. Order1--
Has--> Items each Item --Has --> OrderN where (OrderN != Order1)
geode-core/src/integrationTest/java/org/apache/geode/management/DataQueryEngineIntegrationTest.java