private void createPersistOnly() {
    region = DiskRegionHelperFactory.getAsyncPersistOnlyRegion(cache, diskProps);
  }
This test does a check that conflation in the buffer happen correctly

Conflation cases tested include:
<ul>
<li>create, modify
<li>create, destroy
<li>create, destroy, create
<li>create, invalidate
<li>create, invalidate
<li>create, invalidate, modify
</ul>
The test is done for persist only, overflow only and persist + overflow only (async modes).
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/ConflationJUnitTest.java