Added IPAddress.Increment/Decrement; Added ParseNetwork, ExpandNetwork

UnitTests/Common/Extensions/IPAddressExtensionsTests.cs

@@ -0,0 +1,67 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace UnitTests.Common.Extensions
+{
+	[TestClass]
+	[System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
+	public class IPAddressExtensionsTests
+	{
+		[TestMethod]
+		public void ShouldIncrementLastByte()
+		{
+			// arrange
+			var ipAddress = IPAddress.Parse("192.168.178.22");
+
+			// act
+			var incremented = ipAddress.Increment();
+
+			// assert
+			Assert.AreEqual("192.168.178.23", incremented.ToString());
+		}
+
+		[TestMethod]
+		public void ShouldIncrementAllBytes()
+		{
+			// arrange
+			var ipAddress = IPAddress.Parse("192.255.255.255");
+
+			// act
+			var incremented = ipAddress.Increment();
+
+			// assert
+			Assert.AreEqual("193.0.0.0", incremented.ToString());
+		}
+
+		[TestMethod]
+		public void ShouldDecrementLastByte()
+		{
+			// arrange
+			var ipAddress = IPAddress.Parse("192.168.178.22");
+
+			// act
+			var decremented = ipAddress.Decrement();
+
+			// assert
+			Assert.AreEqual("192.168.178.21", decremented.ToString());
+		}
+
+		[TestMethod]
+		public void ShouldDecrementAllBytes()
+		{
+			// arrange
+			var ipAddress = IPAddress.Parse("192.0.0.0");
+
+			// act
+			var decremented = ipAddress.Decrement();
+
+			// assert
+			Assert.AreEqual("191.255.255.255", decremented.ToString());
+		}
+	}
+}