Chapter13.15 bug fix

src/Chapter13.Tests/Listing13.15.Tests.cs

@@ -0,0 +1,24 @@
+
+namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter13.Listing13_15.Tests;
+
+[TestClass]
+public class ProgramTests
+{
+    [TestMethod]
+    public void MainTest()
+    {
+        const string expectedOutput = "ValidInput";
+        string simulatedInput = "\n   \nValidInput\n";
+
+        IntelliTect.TestTools.Console.ConsoleAssert.Expect(
+            expectedOutput,
+            () =>
+            {
+                using (StringReader simulatedReader = new (simulatedInput))
+                {
+                    Console.SetIn(simulatedReader);
+                    Program.Main();
+                }
+            });
+    }
+}

src/Chapter13/Listing13.15.ParameterlessStatementLambdas.cs

@@ -17,11 +17,11 @@ public static void Main()
                 {
                     input = Console.ReadLine();
                 }
-                while(!string.IsNullOrWhiteSpace(input));
+                while(string.IsNullOrWhiteSpace(input));
                 return input!;
             };
         //...
         #endregion INCLUDE
-        getUserInput();
+        Console.WriteLine(getUserInput());
     }
 }