void setTableEntryForTesting(int i, InternalEntry<K, V, ?> entry) {
      table.set(i, castForTesting(entry));
    }

    /** Unsafely returns a copy of the given entry. */
    E copyForTesting(InternalEntry<K, V, ?> entry, @Nullable InternalEntry<K, V, ?> newNext) {
      return this.map.entryHelper.copy(self(), castForTesting(entry), castForTesting(newNext));
    }

    /** Unsafely sets the value of the given entry. */