Added in listing tests and privacy specification Chapter 6 (#330)

Co-authored-by: Emma Spence <emma.spence@intellitect.com>

Author: espence2003

src/Chapter06.Tests/Listing06.01.Tests.cs

@@ -0,0 +1,17 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter06.Listing06_01.Tests
+{
+    [TestClass]
+    public class ProgramTests
+    {
+        [TestMethod]
+        public void MainTest()
+        {
+            const string expected = @"No output in this example";
+
+            IntelliTect.TestTools.Console.ConsoleAssert.Expect(
+                expected, Program.Main);
+        }
+    }
+}

src/Chapter06.Tests/Listing06.34.Tests.cs

@@ -0,0 +1,17 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter06.Listing06_34.Tests
+{
+    [TestClass]
+    public class EmployeeTests
+    {
+        [TestMethod]
+        public void MainTest()
+        {
+            const string expected = @"Inigo Montoya";
+
+            IntelliTect.TestTools.Console.ConsoleAssert.Expect(
+                expected, Program.Main);
+        }
+    }
+}

src/Chapter06.Tests/Listing06.49.Tests.cs

@@ -0,0 +1,17 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter06.Listing06_49.Tests
+{
+    [TestClass]
+    public class DirectoryTests
+    {
+        [TestMethod]
+        public void MainTest()
+        {
+            const string expected = @"System.Boolean[,,]";
+
+            IntelliTect.TestTools.Console.ConsoleAssert.Expect(
+                expected, Program.Main);
+        }
+    }
+}

src/Chapter06/Listing06.49.DeclaringAReadOnlyAutomaticallyImplementedProperty.cs

@@ -15,7 +15,7 @@ class CommonGuid
         // ...
     }
 
-    class Program
+    public class Program
     {
         public static void Main()
         {