Chapter 4: added missing tests. Both fail and pass properly. (#329)

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

Author: espence2003

src/Chapter04.Tests/Listing04.15.Tests.cs

@@ -0,0 +1,18 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter04.Listing04_15.Tests
+{
+    [TestClass]
+    public class ProgramTests
+    {
+        [TestMethod]
+        public void MainTest()
+        {
+            const string expected = 
+                @"z=122	y=121	x=120	w=119	v=118	u=117	t=116	s=115	r=114	q=113	p=112	o=111	n=110	m=109	l=108	k=107	j=106	i=105	h=104	g=103	f=102	e=101	d=100	c=99	b=98	a=97	";
+
+            IntelliTect.TestTools.Console.ConsoleAssert.Expect(
+                expected, Program.Main);
+        }
+    }
+}

src/Chapter04.Tests/Listing04.27.Tests.cs

@@ -0,0 +1,17 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter04.Listing04_27.Tests
+{
+    [TestClass]
+    public class ProgramTests
+    {
+        [TestMethod]
+        public void MainTest()
+        {
+            const string expected = @"Enter the number of players (1 or 2):";
+
+            IntelliTect.TestTools.Console.ConsoleAssert.Expect(
+                expected, Program.Main);
+        }
+    }
+}