private static void verifyException(Exception e) {
    String error = e.getMessage();
    if (e.getCause() != null) {
      error = e.getCause().getMessage();
    }

    if (error.contains("Query execution canceled after exceeding max execution time")
        || error.contains("The Query completed sucessfully before it got canceled")
        || error.contains("The QueryMonitor thread may be sleeping longer than the set sleep time")
        || error.contains(
            "The query task could not be found but the query is marked as having been canceled")) {
      // Expected exception.
      return;
    }

    System.out.println("Unexpected exception:");
    if (e.getCause() != null) {
      e.getCause().printStackTrace();
    } else {
      e.printStackTrace();
    }

    fail("Expected exception Not found. Expected exception with message: \n"
        + "\"Query execution taking more than the max execution time\"" + "\n Found \n" + error);
  }
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