private static void clearRegion(Region r) throws TimeoutException {
    Iterator kI = r.keySet().iterator();
    try {
      while (kI.hasNext()) {
        r.destroy(kI.next());
      }
    } catch (CacheException ce) {
      fail("clearRegion operation failed");
    }
  }
Test to make sure CacheListener callbacks are called in place with the CacheEvents properly
constructed
geode-core/src/integrationTest/java/org/apache/geode/TXJUnitTest.java