@Override
      public void run() {
        RegionEntry entry = CCRegion.getRegionEntry("object2");
        assertThat(entry).isNotNull();
        assertThat(entry.isTombstone()).isTrue();
      }
Clear all existing transaction listeners and install the given listener.
geode-dunit/src/main/java/org/apache/geode/cache30/MultiVMRegionTestCase.java