segment.setValueForTesting(entryOne, valueOne);

      Object keyTwo = new Object();
      Object valueTwo = new Object();
      int hashTwo = map.hash(keyTwo);
      InternalEntry<Object, Object, ?> entryTwo = segment.newEntryForTesting(keyTwo, hashTwo, null);
      segment.setValueForTesting(entryTwo, valueTwo);

      segment.setValueForTesting(entryOne, valueOne);

      Object keyTwo = new Object();
      Object valueTwo = new Object();
      int hashTwo = map.hash(keyTwo);
      InternalEntry<Object, Object, ?> entryTwo = segment.newEntryForTesting(keyTwo, hashTwo, null);
      segment.setValueForTesting(entryTwo, valueTwo);

      return this.map.entryHelper.copy(self(), castForTesting(entry), castForTesting(newNext));
    }

    /** Unsafely sets the value of the given entry. */
    void setValueForTesting(InternalEntry<K, V, ?> entry, V value) {
      this.map.entryHelper.setValue(self(), castForTesting(entry), value);
    }

    /** Unsafely returns a fresh entry. */