Add CoefficientOfThermalExpansion operators (#1284)

Added CTE * TemperatureDelta to CoefficientOfThermalExpansion.extra.cs.
Added TemperatureDelta to TemperatureDelta.extra.cs.
Added corresponding tests to CoefficientOfThermalExpansionTests.cs

Author: tm-ren

UnitsNet.Tests/CustomCode/CoefficientOfThermalExpansionTests.cs

@@ -21,8 +21,7 @@
 // Licensed under MIT No Attribution, see LICENSE file at the root.
 // Copyright 2013 Andreas Gullberg Larsen (andreas.larsen84@gmail.com). Maintained at https://github.com/angularsen/UnitsNet.
 
-
-using System;
+using Xunit;
 
 namespace UnitsNet.Tests.CustomCode
 {
@@ -35,5 +34,25 @@ public class CoefficientOfThermalExpansionTests : CoefficientOfThermalExpansionT
         protected override double InverseDegreeFahrenheitInOneInverseKelvin => 0.5555555555555556;
 
         protected override double InverseKelvinInOneInverseKelvin => 1.0;
+
+        [Fact]
+        public void CoefficientOfThermalExpansionTimesTemperatureDelta()
+        {
+            double temperatureDeltaDegC = 2.0;
+            double ctePerDegC = 0.001;
+            CoefficientOfThermalExpansion cte = CoefficientOfThermalExpansion.FromInverseDegreeCelsius(ctePerDegC);
+            TemperatureDelta dT = TemperatureDelta.FromDegreesCelsius(temperatureDeltaDegC);
+            AssertEx.EqualTolerance(cte * dT, ctePerDegC * temperatureDeltaDegC, 1e-10);
+        }
+
+        [Fact]
+        public void TemperatureDeltaTimesCoefficientOfThermalExpansion()
+        {
+            double temperatureDeltaDegC = 2.0;
+            double ctePerDegC = 0.001;
+            CoefficientOfThermalExpansion cte = CoefficientOfThermalExpansion.FromInverseDegreeCelsius(ctePerDegC);
+            TemperatureDelta dT = TemperatureDelta.FromDegreesCelsius(temperatureDeltaDegC);
+            AssertEx.EqualTolerance(dT * cte, temperatureDeltaDegC * ctePerDegC, 1e-10);
+        }
     }
 }

UnitsNet/CustomCode/Quantities/CoefficientOfThermalExpansion.extra.cs

@@ -0,0 +1,11 @@
+// Licensed under MIT No Attribution, see LICENSE file at the root.
+// Copyright 2013 Andreas Gullberg Larsen (andreas.larsen84@gmail.com). Maintained at https://github.com/angularsen/UnitsNet.
+
+namespace UnitsNet
+{
+    public partial struct CoefficientOfThermalExpansion
+    {
+        /// <summary>Get a scalar from a <see cref="CoefficientOfThermalExpansion"/> multiplied by a <see cref="TemperatureDelta"/>.</summary>
+        public static double operator *(CoefficientOfThermalExpansion cte, TemperatureDelta temperatureDelta) => cte.InverseKelvin * temperatureDelta.Kelvins;
+    }
+}

UnitsNet/CustomCode/Quantities/TemperatureDelta.extra.cs

@@ -34,5 +34,11 @@ public partial struct TemperatureDelta
         {
             return Energy.FromJoules(entropy.JoulesPerKelvin * temperatureDelta.Kelvins);
         }
+
+        /// <summary>Get a scalar from a <see cref="TemperatureDelta"/> multiplied by a <see cref="CoefficientOfThermalExpansion"/>.</summary>
+        public static double operator *(TemperatureDelta temperatureDelta, CoefficientOfThermalExpansion cte)
+        {
+            return temperatureDelta.Kelvins * cte.InverseKelvin;
+        }
     }
 }