@Before
  public void createRegion() {
    region = cache.<String, String>createRegionFactory()
        .setEvictionAttributes(
            EvictionAttributes.createLRUEntryAttributes(1, EvictionAction.OVERFLOW_TO_DISK))
        .setPartitionAttributes(
            new PartitionAttributesFactory<>().setTotalNumBuckets(1).create())
        .setDataPolicy(DataPolicy.PARTITION).create("ReplaceWithOverflowJUnitTest");
  }
Test the replace method with an entry that has overflowed to disk.
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/ReplaceWithOverflowJUnitTest.java