@Override
    public KTable<K, Long> count(final Materialized<K, Long, KeyValueStore<Bytes, byte[]>> materialized) {
        return count(NamedInternal.empty(), materialized);
    }
@SuppressWarnings("unchecked")
    @Test
    public void shouldThrowNullPointOnCountWhenMaterializedIsNull() {
        assertThrows(NullPointerException.class, () -> groupedTable.count((Materialized) null));
    }