int hashOne = map.hash(keyOne);
      InternalEntry<Object, Object, ?> entryOne = segment.newEntryForTesting(keyOne, hashOne, null);
      WeakValueReference<Object, Object, ?> valueRefOne =
          segment.newWeakValueReferenceForTesting(entryOne, valueOne);
      assertSame(valueOne, valueRefOne.get());
      segment.setWeakValueReferenceForTesting(entryOne, valueRefOne);

      assertSame(keyOne, entryOne.getKey());

      int hashOne = map.hash(keyOne);
      InternalEntry<Object, Object, ?> entryOne = segment.newEntryForTesting(keyOne, hashOne, null);
      WeakValueReference<Object, Object, ?> valueRefOne =
          segment.newWeakValueReferenceForTesting(entryOne, valueOne);
      assertSame(valueOne, valueRefOne.get());
      segment.setWeakValueReferenceForTesting(entryOne, valueRefOne);

      assertSame(keyOne, entryOne.getKey());

    }

    /**
     * Unsafely creates of a fresh {@link WeakValueReference}, referencing the given {@code value},
     * for the given {@code entry}
     */
    WeakValueReference<K, V, E> newWeakValueReferenceForTesting(
        InternalEntry<K, V, ?> entry, V value) {
      throw new AssertionError();
    }

    /**