public void NaamSetterTest()
        {
            var d = new VeldDefinitie {
                Naam = "Eerste (9)"
            };

            Assert.Equal("eerste_9_", d.Naam);
        }
        public void FormatANTest()
        {
            var d = new VeldDefinitie {
                Lengte = 6
            };

            Assert.Equal("x     ", d.FormatAN("x"));
            Assert.Equal("test  ", d.FormatAN("test"));
        }
        public void FormatNTest()
        {
            var d = new VeldDefinitie {
                Lengte = 6
            };

            Assert.Equal("000001", d.FormatN(1));
            Assert.Equal("004327", d.FormatN(4327));
        }