private void doPuts() {
    Region<Integer, Object> region = getCache().getRegion(uniqueName);
    for (int i = 0; i < ENTRY_COUNT; i++) {
      region.put(i, i);
    }
  }
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