private void createPartitionedRegion() {
    getCache().<Integer, Object>createRegionFactory(RegionShortcut.PARTITION).create(uniqueName);
  }
Iterating over Region.entrySet() should not return null for PartitionedRegion.

<p>
TRAC #45164: Iterating on Region.entrySet() can return null on partitioned region
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/PREntrySetIteratorRegressionTest.java