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

    suite.addTest(