public void CalculateAmount_TwoValuesAdded_CorrectAmount() { var rows = new List <HaushaltsbuchDS.BuchungssatzRow> { _testDataTable.ElementAt(0), _testDataTable.ElementAt(1) }; var result = Cash.CalculateAmount(rows.OrderBy(x => x.Datum)); Assert.That(result, Is.EqualTo(500)); }