Moved all UnitTests to a single project. Implemented parts of AspNetCore UnitTests.

UnitTests/Common/Extensions/ExceptionExtensionsTests.cs

@@ -0,0 +1,75 @@
+using System;
+using System.Collections.Generic;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace UnitTests.Common.Extensions
+{
+	[TestClass]
+	[System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
+	public class ExceptionExtensionsTests
+	{
+		[TestMethod]
+		public void ShouldReturnExceptionMessage()
+		{
+			// arrange
+			var exception = new Exception("This is a message.");
+
+			// act
+			string message = exception.GetMessage();
+
+			// assert
+			Assert.AreEqual(exception.Message, message);
+		}
+
+		[TestMethod]
+		public void ShouldReturnInnerExceptionMessage()
+		{
+			// arrange
+			var innerException = new Exception("Message from the inner side.");
+			var outerException = new Exception("Message from the outer side.", innerException);
+
+			// act
+			string message = outerException.GetMessage();
+
+			// assert
+			Assert.AreEqual(innerException.Message, message);
+		}
+
+		[TestMethod]
+		public void ShouldReturnRecursiveExceptionMessageFoInnerException()
+		{
+			// arrange
+			var innerException = new Exception("Message from the inner side.");
+			var outerException = new Exception("Message from the outer side. See the inner exception for details.", innerException);
+			string expectedMessage = $"Message from the outer side. Message from the inner side.";
+
+			// act
+			string message = outerException.GetRecursiveMessage();
+
+			// assert
+			Assert.AreEqual(expectedMessage, message);
+		}
+
+		[TestMethod]
+		public void ShouldReturnRecursiveExceptionMessageFoInnerExceptions()
+		{
+			// arrange
+			var innerExceptions = new List<Exception>
+			{
+				new Exception("Inner Exception 1."),
+				new Exception("Inner Exception 2. See the inner exception for details.", new Exception("Inner Exception of Exception 2.")),
+				new Exception("Inner Exception 3."),
+				new Exception("Inner Exception 4."),
+				new Exception("Inner Exception 5.")
+			};
+			var aggregateException = new AggregateException("Lots of exceptions.", innerExceptions);
+			string expectedMessage = "Inner Exception 1. Inner Exception 2. Inner Exception of Exception 2. Inner Exception 3.";
+
+			// act
+			string message = aggregateException.GetRecursiveMessage();
+
+			// assert
+			Assert.AreEqual(expectedMessage, message);
+		}
+	}
+}