@Override
    public void fromData(DataInput in) throws IOException, ClassNotFoundException {
      hashCode = in.readInt();
    }
Test the test method PartitionedRegion.getAllNodes Verify that it returns nodes after a value
has been placed into the PartitionedRegion.

@see PartitionedRegion#getAllNodes()
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/PartitionedRegionTestUtilsDUnitTest.java