Add charge density for surface (C/m²) (#640)

Author: tmilnthorp

Common/UnitDefinitions/ElectricChargeDensity.json

@@ -1,7 +1,7 @@
 {
   "Name": "ElectricChargeDensity",
   "BaseUnit": "CoulombPerCubicMeter",
-  "XmlDoc": "In electromagnetism, charge density is a measure of the amount of electric charge per unit length, surface area, or volume.",
+  "XmlDoc": "In electromagnetism, charge density is a measure of the amount of electric charge per volume.",
   "XmlDocRemarks": "https://en.wikipedia.org/wiki/Charge_density",
   "BaseDimensions": {
     "L": -3,
@@ -12,6 +12,11 @@
     {
       "SingularName": "CoulombPerCubicMeter",
       "PluralName": "CoulombsPerCubicMeter",
+      "BaseUnits": {
+        "L": "Meter",
+        "T": "Second",
+        "I": "Ampere"
+      },
       "FromUnitToBaseFunc": "x",
       "FromBaseToUnitFunc": "x",
       "Localization": [

Common/UnitDefinitions/ElectricSurfaceChargeDensity.json

@@ -0,0 +1,64 @@
+{
+  "Name": "ElectricSurfaceChargeDensity",
+  "BaseUnit": "CoulombPerSquareMeter",
+  "XmlDoc": "In electromagnetism, surface charge density is a measure of the amount of electric charge per surface area.",
+  "XmlDocRemarks": "https://en.wikipedia.org/wiki/Charge_density",
+  "BaseDimensions": {
+    "L": -2,
+    "T": 1,
+    "I": 1
+  },
+  "Units": [
+    {
+      "SingularName": "CoulombPerSquareMeter",
+      "PluralName": "CoulombsPerSquareMeter",
+      "BaseUnits": {
+        "L": "Meter",
+        "T": "Second",
+        "I": "Ampere"
+      },
+      "FromUnitToBaseFunc": "x",
+      "FromBaseToUnitFunc": "x",
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "C/m²" ]
+        }
+      ]
+    },
+    {
+      "SingularName": "CoulombPerSquareCentimeter",
+      "PluralName": "CoulombsPerSquareCentimeter",
+      "BaseUnits": {
+        "L": "Centimeter",
+        "T": "Second",
+        "I": "Ampere"
+      },
+      "FromUnitToBaseFunc": "x * 1.0e4",
+      "FromBaseToUnitFunc": "x / 1.0e4",
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "C/cm²" ]
+        }
+      ]
+    },
+    {
+      "SingularName": "CoulombPerSquareInch",
+      "PluralName": "CoulombsPerSquareInch",
+      "BaseUnits": {
+        "L": "Inch",
+        "T": "Second",
+        "I": "Ampere"
+      },
+      "FromUnitToBaseFunc": "x * 1.5500031000062000e3",
+      "FromBaseToUnitFunc": "x / 1.5500031000062000e3",
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "C/in²" ]
+        }
+      ]
+    }
+  ]
+}

UnitsNet.Tests/CustomCode/ElectricSurfaceChargeDensityTests.cs

@@ -0,0 +1,35 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated (once) by \generate-code.bat, but will not be
+//     regenerated when it already exists. The purpose of creating this file is to make
+//     it easier to remember to implement all the unit conversion test cases.
+//
+//     Whenever a new unit is added to this quantity and \generate-code.bat is run,
+//     the base test class will get a new abstract property and cause a compile error
+//     in this derived class, reminding the developer to implement the test case
+//     for the new unit.
+//
+//     See https://github.com/angularsen/UnitsNet/wiki/Adding-a-New-Unit for how to add or edit units.
+//
+//     Add CustomCode\Quantities\MyQuantity.extra.cs files to add code to generated quantities.
+//     Add UnitDefinitions\MyQuantity.json and run generate-code.bat to generate new units or quantities.
+//
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+// Licensed under MIT No Attribution, see LICENSE file at the root.
+// Copyright 2013 Andreas Gullberg Larsen ([email protected]). Maintained at https://github.com/angularsen/UnitsNet.
+
+using System;
+
+namespace UnitsNet.Tests.CustomCode
+{
+    public class ElectricSurfaceChargeDensityTests : ElectricSurfaceChargeDensityTestsBase
+    {
+        protected override double CoulombsPerSquareMeterInOneCoulombPerSquareMeter => 1.0;
+
+        protected override double CoulombsPerSquareCentimeterInOneCoulombPerSquareMeter => 1.0e-4;
+
+        protected override double CoulombsPerSquareInchInOneCoulombPerSquareMeter => 6.4516e-4;
+    }
+}