private static <K, V> DummyEntry<K, V> createDummyEntry(
      K key, int hash, V value, @Nullable ReferenceEntry<K, V> next) {
    DummyEntry<K, V> entry = DummyEntry.create(key, hash, next);
    DummyValueReference<K, V> valueRef = DummyValueReference.create(value);
    entry.setValueReference(valueRef);
    return entry;
  }

  static class DummyEntry<K, V> implements ReferenceEntry<K, V> {

    InternalEntry<Object, Object, ?> dummyEntry =
        segment.newEntryForTesting(new Object(), hash, entry);
    Object dummyValue = new Object();
    WeakValueReference<Object, Object, ?> dummyValueRef =
        segment.newWeakValueReferenceForTesting(dummyEntry, dummyValue);
    segment.setWeakValueReferenceForTesting(dummyEntry, dummyValueRef);
    segment.setTableEntryForTesting(index, dummyEntry);

    InternalEntry<Object, Object, ?> dummyEntry =
        segment.newEntryForTesting(new Object(), hash, entry);
    Object dummyValue = new Object();
    WeakValueReference<Object, Object, ?> dummyValueRef =
        segment.newWeakValueReferenceForTesting(dummyEntry, dummyValue);
    segment.setWeakValueReferenceForTesting(dummyEntry, dummyValueRef);
    segment.setTableEntryForTesting(index, dummyEntry);