Added VersionStringComparer

UnitTests/Common/Comparer/VersionStringComparerTests.cs

@@ -0,0 +1,67 @@
+using AMWD.Common.Comparer;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace UnitTests.Common.Comparer
+{
+	[TestClass]
+	public class VersionStringComparerTests
+	{
+		[DataTestMethod]
+		[DataRow(null, "0")]
+		[DataRow("", "0")]
+		[DataRow("0", "1")]
+		[DataRow("1.0", "1.1")]
+		[DataRow("1.0.0", "1.0.1")]
+		[DataRow("1.0.0.0", "1.0.0.1")]
+		[DataRow("1.0.0.0-RC1", "1.0.0.0-RC2")]
+		public void ShouldBeLessThan(string x, string y)
+		{
+			// Arrange
+			var comparer = new VersionStringComparer();
+
+			// Act
+			int result = comparer.Compare(x, y);
+
+			// Assert
+			Assert.AreEqual(-1, result);
+		}
+
+		[DataTestMethod]
+		[DataRow("0", null)]
+		[DataRow("0", "")]
+		[DataRow("1", "0")]
+		[DataRow("1.1", "1.0")]
+		[DataRow("1.0.1", "1.0.0")]
+		[DataRow("1.0.0.1", "1.0.0.0")]
+		[DataRow("1.0.0.0-RC2", "1.0.0.0-RC1")]
+		public void ShouldBeGreaterThan(string x, string y)
+		{
+			// Arrange
+			var comparer = new VersionStringComparer();
+
+			// Act
+			int result = comparer.Compare(x, y);
+
+			// Assert
+			Assert.AreEqual(1, result);
+		}
+
+		[DataTestMethod]
+		[DataRow(null, null)]
+		[DataRow("", "")]
+		[DataRow("1", "1")]
+		[DataRow("1.2.3", "1.2.3")]
+		[DataRow("1.2.3-alpha", "1.2.3-alpha")]
+		public void ShouldBeEqual(string x, string y)
+		{
+			// Arrange
+			var comparer = new VersionStringComparer();
+
+			// Act
+			int result = comparer.Compare(x, y);
+
+			// Assert
+			Assert.AreEqual(0, result);
+		}
+	}
+}