private static void executeQueries() {
    QueryService queryService;
    try {
      queryService = ClusterStartupRule.getCache().getQueryService();
    } catch (Exception e) {
      queryService = ClusterStartupRule.getClientCache().getQueryService();
    }
    for (String qStr : queryStr) {
      try {
        Query query = queryService.newQuery(qStr);
        query.execute();
        fail("The query should have been canceled by the QueryMonitor. Query: " + qStr);
      } catch (Exception e) {
        verifyException(e);
      }
    }

    final String queryString =
        "SELECT DISTINCT * FROM " + SEPARATOR + "exampleRegion p WHERE p.id = $1";
    final Query query = queryService.newQuery(queryString);

    try {
      for (int i = 0; i < 100; ++i) {
        final Object[] params = new Object[1];
        params[0] = i;

        query.execute(params);
      }
    } catch (final Exception e) {
      verifyException(e);
    }
  }
These tests add a test hook to make sure query execution sleeps for at least 20 ms, so the
queryMonitor thread will get a chance to cancel the query before it completes.

The MAX_QUERY_EXECUTION_TIME is set as 1 ms, i.e, theoretically all queries will be cancelled
after 1ms, but due to thread scheduling, this may not be true. we can only decrease the flakyness
of the test by making MAX_QUERY_EXECUTION_TIME the smallest possible (1) and making the query
execution time longer (but not too long to make the test run too slow).
geode-cq/src/distributedTest/java/org/apache/geode/cache/query/dunit/QueryMonitorDUnitTest.java