Fix listing

Errata.md

@@ -18,4 +18,5 @@ Zhou Jing | 3  | 102 | Change Listing 2.18 to " the Working with Strings listing
 Zhou Jing | 3 | 102 | Changed 'restrictive' to 'less restrictive' in "In each of these cases, the variable declaration is restrictive because the variable may be assigned."
 Zhou Jing | 23 | 1077 | Change "Point Declaration" to "Pointer Declaration" in mindmap
 Zhou Jing | 22 | 1074 | Change "Chapter 19" to "Chapter 20" in "we pointed out in Chapter 19"
-Zhou Jing | 9 | 541 | Change output 9.4 to "ReadOnly, Hidden = 3"
+Zhou Jing | 9 | 541 | Change output 9.4 to "ReadOnly, Hidden = 3"
+Jinhang He | 5 | 255 | Edit listing 5.20 to used `image[index]` for the second print statement

src/Chapter05.Tests/Listing05.20.ReturningAReference.Tests.cs

@@ -8,12 +8,9 @@ public class ProgramTests
     public void Main_InputInigoMontoya_WriteFullName()
     {
         string expected = @"image\[*\]=Red
-image\[*\]=Black";
+image\[*\]=Yellow";
 
-        IntelliTect.TestTools.Console.ConsoleAssert.ExpectLike(expected,
-        () =>
-        {
-            Program.Main();
-        });
+        IntelliTect.TestTools.Console.ConsoleAssert.ExpectLike(expected, 
+            () => Program.Main());
     }
 }

src/Chapter05/Listing05.20.ReturningAReference.cs

@@ -32,11 +32,11 @@ public static void Main()
         #region HIGHLIGHT
         // Obtain a reference to the first red pixel
         ref byte redPixel = ref FindFirstRedEyePixel(image);
-        // Update it to be Black
-        redPixel = (byte)ConsoleColor.Black;
+        // Update it to be Yellow
+        redPixel = (byte)ConsoleColor.Yellow;
         #endregion HIGHLIGHT
         Console.WriteLine(
-            $"image[{index}]={(ConsoleColor)image[redPixel]}");
+            $"image[{index}]={(ConsoleColor)image[index]}");
     }
     #endregion INCLUDE
 }