Table<String, Integer, Character> table = HashBasedTable.create();
                    populateForRowKeySet(table, elements);
                    return unmodifiableTable(table).rowKeySet();
                  }
                })
            .named("unmodifiableTable[HashBasedTable].rowKeySet")
            .withFeatures(COLLECTION_FEATURES)
            .createTestSuite());

    suite.addTest(

   * @since 11.0
   */
  public static <R extends @Nullable Object, C extends @Nullable Object, V extends @Nullable Object>
      Table<R, C, V> unmodifiableTable(Table<? extends R, ? extends C, ? extends V> table) {
    return new UnmodifiableTable<>(table);
  }

  private static class UnmodifiableTable<
          R extends @Nullable Object, C extends @Nullable Object, V extends @Nullable Object>