added a equal method for relative equivalence in asserthelper

VectoCoreTest/Models/Declaration/DeclarationDataTest.cs

@@ -170,10 +170,9 @@ namespace TUGraz.VectoCore.Tests.Models.Declaration
 				var mu = tc.LookupMu(exp.nu);
 				Assert.AreEqual(mu, exp.mu);
 
-				var angularSpeed = r.Next(700).SI<PerSecond>();
+				var angularSpeed = r.Next(1000).SI<PerSecond>();
 				var torque = tc.LookupTorque(exp.nu, angularSpeed, referenceSpeed);
-				Assert.AreEqual(exp.torque * Math.Pow(angularSpeed.Double() / referenceSpeed.Double(), 2), torque.Double(),
-					Tolerance);
+				AssertHelper.AreEqual(exp.torque * Math.Pow(angularSpeed.Double() / referenceSpeed.Double(), 2), torque.Double());
 			}
 		}
 

VectoCoreTest/Utils/AssertHelper.cs

 using System;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
+using TUGraz.VectoCore.Utils;
 
 namespace TUGraz.VectoCore.Tests.Utils
 {
@@ -20,5 +21,19 @@ namespace TUGraz.VectoCore.Tests.Utils
 				}
 			}
 		}
+
+		public static void AreEqual(double expected, double actual,
+			double toleranceFactor = DoubleExtensionMethods.Tolerance)
+		{
+			if (actual.IsEqual(0.0)) {
+				Assert.AreEqual(expected, 0.0, DoubleExtensionMethods.Tolerance,
+					string.Format("AssertHelper.AreEqual failed. Expected: {0}, Actual: {1}, Tolerance: {2}", expected, actual,
+						toleranceFactor));
+				return;
+			}
+			Assert.IsTrue(Math.Abs(expected / actual) < 1 + toleranceFactor,
+				string.Format("AssertHelper.AreEqual failed. Expected: {0}, Actual: {1}, Tolerance: {2}", expected, actual,
+					toleranceFactor));
+		}
 	}
 }
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