public void Der_Generator_wird_fuer_jeden_Wert_aufgerufen() {
            var columnDefinitions = new[] { new ColumnDefinition("", new IncrementingIntGenerator()) };

            var values = columnDefinitions.GenerateValues();
            Assert.That(values, Is.EqualTo(new[]{0}));

            values = columnDefinitions.GenerateValues();
            Assert.That(values, Is.EqualTo(new[]{1}));

            values = columnDefinitions.GenerateValues();
            Assert.That(values, Is.EqualTo(new[]{2}));
        }