@Test
  public void testQueryObjectReusableAfterFirstExecutionTimesOut() throws Exception {
    server1.invoke(() -> {
      // Setting query timeout to 10 seconds
      GemFireCacheImpl.MAX_QUERY_EXECUTION_TIME = 10000;

      final InternalCache cache = ClusterStartupRule.getCache();
      final String regionName = "exampleRegion";
      final RegionFactory<Integer, Integer> regionFactory =
          cache.createRegionFactory(RegionShortcut.LOCAL);
      final Region<Integer, Integer> exampleRegion = regionFactory.create(regionName);
      final int numRegionEntries = 10;
      for (int i = 0; i < numRegionEntries; ++i) {
        exampleRegion.put(i, i);
      }

      final String queryString = "select * from " + SEPARATOR + regionName;
      final Query query = cache.getQueryService().newQuery(queryString);

      // Install a test hook which causes the query to timeout
      DefaultQuery.testHook =
          (spot, qry, executionContext) -> {
            if (spot != DefaultQuery.TestHook.SPOTS.BEFORE_QUERY_DEPENDENCY_COMPUTATION) {
              return;
            }

            await("stall the query execution so that it gets cancelled")
                .until(executionContext::isCanceled);
          };

      assertThatThrownBy(query::execute).isInstanceOf(QueryExecutionTimeoutException.class);

      // Uninstall test hook so that query object is reused to execute again, this time successfully
      DefaultQuery.testHook = null;

      final SelectResults results = (SelectResults) query.execute();

      for (int i = 0; i < numRegionEntries; ++i) {
        assertThat(results.contains(i)).isTrue();
      }
    });
  }
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