Added enumerations for area units.

Added tests for area in UnitConverterTests.cs and UnitValueTests.cs.

Author: angularsen

Src/UnitsNet/Unit.cs

@@ -90,6 +90,13 @@ public enum Unit
         PoundForce,
         Poundal,
 
+        // Area
+        SquareKilometer,
+        SquareMeter,
+        SquareDecimeter,
+        SquareCentimeter,
+        SquareMillimeter,
+
         // Volume
         CubicKilometer,
         CubicMeter,

Tests/UnitConverterTests.cs

@@ -42,6 +42,16 @@ public void CubicMeterToVolumeUnits()
             Assert.AreEqual(1E6, UnitConverter.Convert(1, Unit.CubicMeter, Unit.Milliliter), Delta);
         }
 
+        [Test]
+        public void SquareMeterToAreaUnits()
+        {
+            Assert.AreEqual(1E-6, UnitConverter.Convert(1, Unit.SquareMeter, Unit.SquareKilometer), Delta);
+            Assert.AreEqual(1E0, UnitConverter.Convert(1, Unit.SquareMeter, Unit.SquareMeter), Delta);
+            Assert.AreEqual(1E2, UnitConverter.Convert(1, Unit.SquareMeter, Unit.SquareDecimeter), Delta);
+            Assert.AreEqual(1E4, UnitConverter.Convert(1, Unit.SquareMeter, Unit.SquareCentimeter), Delta);
+            Assert.AreEqual(1E6, UnitConverter.Convert(1, Unit.SquareMeter, Unit.SquareMillimeter), Delta);
+        }
+
         [Test]
         public void ThrowsOnIncompatibleUnits()
         {

Tests/UnitValueTests.cs

@@ -12,6 +12,7 @@ public void TryConvertReturnsFalseOnIncompatibleUnits()
             Assert.False(new UnitValue(1, Unit.Meter).TryConvert(Unit.Second, out newValue));
             Assert.False(new UnitValue(1, Unit.Kilogram).TryConvert(Unit.Second, out newValue));
             Assert.False(new UnitValue(1, Unit.Pascal).TryConvert(Unit.Second, out newValue));
+            Assert.False(new UnitValue(1, Unit.SquareMeter).TryConvert(Unit.Second, out newValue));
             Assert.False(new UnitValue(1, Unit.CubicMeter).TryConvert(Unit.Second, out newValue));
         }
     }