private void waitForTombstoneCount(int count) {
    try {
      await().until(() -> ((InternalCache) cache).getCachePerfStats().getTombstoneCount() == count);
    } catch (Exception e) {
      // The caller to throw exception with proper message.
    }
  }
The purpose of this test is for a non-replicate region scenario to get the oldest tombstone
and validate that it matches the tombstone of the entry we removed. This is done through a
client
as a client is required to have this non-replicate tombstone.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/versions/TombstoneDUnitTest.java