private void waitForAllTombstonesToExpire(int initialTombstoneCount) {
    try {

      await()
          .until(() -> CCRegion.getTombstoneCount() == 0);
    } catch (ConditionTimeoutException timeout) {
      fail("Timed out waiting for all tombstones to expire.  There are now "
          + CCRegion.getTombstoneCount() + " tombstones left out of " + initialTombstoneCount
          + " initial tombstones. " + CCRegion.getCache().getTombstoneService(), timeout);
    }
  }
Clear all existing transaction listeners and install the given listener.
geode-dunit/src/main/java/org/apache/geode/cache30/MultiVMRegionTestCase.java