adding testcase to reproduce bug

VectoCoreTest/Models/Declaration/DeclarationDataTest.cs

@@ -450,6 +450,17 @@ namespace TUGraz.VectoCore.Tests.Models.Declaration
 			}
 		}
 
+		[TestMethod]
+		public void SegmentLookupTest()
+		{
+			//mock vehicleData
+
+			var segment = DeclarationData.Segments.Lookup(VehicleCategory.RigidTruck, AxleConfiguration.AxleConfig_4x2,
+				12000.SI<Kilogram>(), 0.SI<Kilogram>());
+
+			Assert.AreEqual(VehicleClass.Class2, segment.VehicleClass);
+		}
+
 		[TestMethod]
 		public void SegmentTest()
 		{