From c035e52394a03f3e59ca1a321731e5a0ea5d4a8b Mon Sep 17 00:00:00 2001
From: Tristan Milnthorp <tristan.milnthorp@ansys.com>
Date: Thu, 10 Jun 2021 10:52:05 -0400
Subject: [PATCH] Add inverse methods for electric conductivity and resistivity

---
 .../CustomCode/ElectricConductivityTests.cs   | 16 ++++++++++++++
 .../CustomCode/ElectricResistivityTests.cs    | 16 ++++++++++++++
 .../Quantities/ElectricConductivity.extra.cs  | 22 +++++++++++++++++++
 .../Quantities/ElectricResistivity.extra.cs   | 22 +++++++++++++++++++
 4 files changed, 76 insertions(+)
 create mode 100644 UnitsNet/CustomCode/Quantities/ElectricConductivity.extra.cs
 create mode 100644 UnitsNet/CustomCode/Quantities/ElectricResistivity.extra.cs

diff --git a/UnitsNet.Tests/CustomCode/ElectricConductivityTests.cs b/UnitsNet.Tests/CustomCode/ElectricConductivityTests.cs
index bbb32fbf10..e737605987 100644
--- a/UnitsNet.Tests/CustomCode/ElectricConductivityTests.cs
+++ b/UnitsNet.Tests/CustomCode/ElectricConductivityTests.cs
@@ -22,6 +22,8 @@
 
 
 using System;
+using UnitsNet.Units;
+using Xunit;
 
 namespace UnitsNet.Tests.CustomCode
 {
@@ -31,5 +33,19 @@ public class ElectricConductivityTests : ElectricConductivityTestsBase
         protected override double SiemensPerMeterInOneSiemensPerMeter => 1;
         protected override double SiemensPerInchInOneSiemensPerMeter => 2.54e-2;
         protected override double SiemensPerFootInOneSiemensPerMeter => 3.048e-1;
+
+        [Theory]
+        [InlineData( -1.0, -1.0 )]
+        [InlineData( -2.0, -0.5 )]
+        [InlineData( 0.0, 0.0 )]
+        [InlineData( 1.0, 1.0 )]
+        [InlineData( 2.0, 0.5 )]
+        public static void InverseTest( double value, double expected )
+        {
+            var unit = new ElectricConductivity( value, ElectricConductivityUnit.SiemensPerMeter );
+            var inverse = unit.Inverse();
+
+            AssertEx.Equals( expected, inverse.OhmMeters );
+        }
     }
 }
diff --git a/UnitsNet.Tests/CustomCode/ElectricResistivityTests.cs b/UnitsNet.Tests/CustomCode/ElectricResistivityTests.cs
index 59cca6e1d8..378ec9a82d 100644
--- a/UnitsNet.Tests/CustomCode/ElectricResistivityTests.cs
+++ b/UnitsNet.Tests/CustomCode/ElectricResistivityTests.cs
@@ -22,6 +22,8 @@
 
 
 using System;
+using UnitsNet.Units;
+using Xunit;
 
 namespace UnitsNet.Tests.CustomCode
 {
@@ -55,5 +57,19 @@ public class ElectricResistivityTests : ElectricResistivityTestsBase
         protected override double PicoohmsCentimeterInOneOhmMeter => 1e14;
 
         protected override double PicoohmMetersInOneOhmMeter => 1e+12;
+
+        [Theory]
+        [InlineData( -1.0, -1.0 )]
+        [InlineData( -2.0, -0.5 )]
+        [InlineData( 0.0, 0.0 )]
+        [InlineData( 1.0, 1.0 )]
+        [InlineData( 2.0, 0.5 )]
+        public static void InverseTest( double value, double expected )
+        {
+            var unit = new ElectricResistivity( value, ElectricResistivityUnit.OhmMeter );
+            var inverse = unit.Inverse();
+
+            AssertEx.Equals( expected, inverse.SiemensPerMeter );
+        }
     }
 }
diff --git a/UnitsNet/CustomCode/Quantities/ElectricConductivity.extra.cs b/UnitsNet/CustomCode/Quantities/ElectricConductivity.extra.cs
new file mode 100644
index 0000000000..766f78c677
--- /dev/null
+++ b/UnitsNet/CustomCode/Quantities/ElectricConductivity.extra.cs
@@ -0,0 +1,22 @@
+// 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 UnitsNet.Units;
+
+namespace UnitsNet
+{
+    public partial struct ElectricConductivity
+    {
+        /// <summary>
+        /// Calculates the inverse or <see cref="ElectricResistivity"/> of this unit.
+        /// </summary>
+        /// <returns>The inverse or <see cref="ElectricResistivity"/> of this unit.</returns>
+        public ElectricResistivity Inverse()
+        {
+            if( SiemensPerMeter == 0.0 )
+                return new ElectricResistivity( 0.0, ElectricResistivityUnit.OhmMeter );
+
+            return new ElectricResistivity( 1 / SiemensPerMeter, ElectricResistivityUnit.OhmMeter );
+        }
+    }
+}
diff --git a/UnitsNet/CustomCode/Quantities/ElectricResistivity.extra.cs b/UnitsNet/CustomCode/Quantities/ElectricResistivity.extra.cs
new file mode 100644
index 0000000000..a58e80c8a9
--- /dev/null
+++ b/UnitsNet/CustomCode/Quantities/ElectricResistivity.extra.cs
@@ -0,0 +1,22 @@
+// 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 UnitsNet.Units;
+
+namespace UnitsNet
+{
+    public partial struct ElectricResistivity
+    {
+        /// <summary>
+        /// Calculates the inverse or <see cref="ElectricConductivity"/> of this unit.
+        /// </summary>
+        /// <returns>The inverse or <see cref="ElectricConductivity"/> of this unit.</returns>
+        public ElectricConductivity Inverse()
+        {
+            if( OhmMeters == 0.0 )
+                return new ElectricConductivity( 0, ElectricConductivityUnit.SiemensPerMeter );
+
+            return new ElectricConductivity( 1 / OhmMeters, ElectricConductivityUnit.SiemensPerMeter );
+        }
+    }
+}