update code ref 7-3

Author: v-thpra

docs/test/live-unit-testing-start.md

@@ -76,7 +76,41 @@ Now that you've created the solution, you'll create a class library named String
 
 5. Replace all of the existing code in the code editor with the following code:
 
-   :::code language="csharp" source="samples/csharp/UtilityLibraries/StringLibrary/Class1.cs" id="Snippet1":::
+   ```csharp
+   using System;
+
+   namespace UtilityLibraries
+   {
+       public static class StringLibrary
+       {
+           public static bool StartsWithUpper(this string s)
+           {
+               if (String.IsNullOrWhiteSpace(s))
+                   return false;
+
+               return Char.IsUpper(s[0]);
+           }
+
+           public static bool StartsWithLower(this string s)
+           {
+               if (String.IsNullOrWhiteSpace(s))
+                   return false;
+
+               return Char.IsLower(s[0]);
+           }
+
+           public static bool HasEmbeddedSpaces(this string s)
+           {
+               foreach (var ch in s.Trim())
+               {
+                   if (ch == ' ')
+                       return true;
+               }
+               return false;
+           }
+       }
+   }
+   ```
 
    StringLibrary has three static methods:
 
@@ -134,7 +168,59 @@ The next step is to create the unit test project to test the StringLibrary libra
 
 6. Replace the boilerplate unit test code provided by the template with the following code:
 
-   :::code language="csharp" source="samples/snippets/csharp/lut-start/unittest1.cs" id="Snippet1":::
+   ```csharp
+   using System;
+   using Microsoft.VisualStudio.TestTools.UnitTesting;
+   using UtilityLibraries;
+
+   namespace StringLibraryTest
+   {
+       [TestClass]
+       public class UnitTest1
+       {
+           [TestMethod]
+           public void TestStartsWithUpper()
+           {
+               // Tests that we expect to return true.
+               string[] words = { "Alphabet", "Zebra", "ABC", "Αθήνα", "Москва" };
+               foreach (var word in words)
+               {
+                   bool result = word.StartsWithUpper();
+                   Assert.IsTrue(result,
+                                 $"Expected for '{word}': true; Actual: {result}");
+               }
+           }
+
+           [TestMethod]
+           public void TestDoesNotStartWithUpper()
+           {
+               // Tests that we expect to return false.
+               string[] words = { "alphabet", "zebra", "abc", "αυτοκινητοβιομηχανία", "государство",
+                                  "1234", ".", ";", " " };
+               foreach (var word in words)
+               {
+                   bool result = word.StartsWithUpper();
+                   Assert.IsFalse(result,
+                                  $"Expected for '{word}': false; Actual: {result}");
+               }
+           }
+
+           [TestMethod]
+           public void DirectCallWithNullOrEmpty()
+           {
+               // Tests that we expect to return false.
+               string[] words = { String.Empty, null };
+               foreach (var word in words)
+               {
+                   bool result = StringLibrary.StartsWithUpper(word);
+                   Assert.IsFalse(result,
+                                  $"Expected for '{(word == null ? "<null>" : word)}': " +
+                                  $"false; Actual: {result}");
+               }
+           }
+       }
+   }
+   ```
 
 7. Save your project by selecting the **Save** icon on the toolbar.