Updated TokenizingTextBox.MaxTokens test

Author: shweaver-MSFT

Microsoft.Toolkit.Uwp.UI.Controls.Input/TokenizingTextBox/TokenizingTextBox.Properties.cs

@@ -176,7 +176,7 @@ private static void OnMaxTokensChanged(DependencyObject d, DependencyPropertyCha
                     int tokensToRemove = tokenCount - Math.Max(newMaxTokens, 0);
 
                     // Start at the end, remove any extra tokens.
-                    for (var i = tokenCount; i >= tokenCount - tokensToRemove; --i)
+                    for (var i = tokenCount; i > tokenCount - tokensToRemove; --i)
                     {
                         var token = ttb._innerItemsSource.ItemsSource[i - 1];
 

UnitTests/UnitTests.UWP/UI/Controls/Test_TokenizingTextBox_General.cs

@@ -104,7 +104,8 @@ public void Test_MaxTokens()
 
             tokenBox.MaxTokens = 1;
 
-            Assert.AreEqual(1, tokenBox.Items.Count);
+            Assert.AreEqual(startingItemsCount + 1, tokenBox.Items.Count);
+            Assert.AreEqual("TokenItem1", tokenBox.Items[0]);
         }
     }
 }