@Override
    public KTable<K, V> toTable() {
        return toTable(NamedInternal.empty(), Materialized.with(keySerde, valueSerde));
    }
@Test
    public void shouldNotAllowNullNamedOnToTableWithMaterialized() {
        final NullPointerException exception = assertThrows(
            NullPointerException.class,
            () -> testStream.toTable(null, Materialized.with(null, null)));
        assertThat(exception.getMessage(), equalTo("named can't be null"));
    }