update corresponding tests and comments

Author: huynhsontung

Microsoft.Toolkit.Uwp.UI/Extensions/Markup/Abstract/TextIconExtension.cs

@@ -23,7 +23,7 @@ public abstract class TextIconExtension : MarkupExtension
         private static FontFamily symbolThemeFontFamily;
 
         /// <summary>
-        /// Gets the reusable "Segoe MDL2 Assets" <see cref="FontFamily"/> instance.
+        /// Gets the reusable "Segoe Fluent Icons,Segoe MDL2 Assets" <see cref="FontFamily"/> instance.
         /// </summary>
         protected static FontFamily SymbolThemeFontFamily
         {

Microsoft.Toolkit.Uwp.UI/Extensions/Markup/FontIconExtension.cs

@@ -20,7 +20,7 @@ public class FontIconExtension : TextIconExtension
         public string Glyph { get; set; }
 
         /// <summary>
-        /// Gets or sets the font family to use to display the icon. If <see langword="null"/>, "Segoe MDL2 Assets" will be used.
+        /// Gets or sets the font family to use to display the icon. If <see langword="null"/>, "Segoe Fluent Icons,Segoe MDL2 Assets" will be used.
         /// </summary>
         public FontFamily FontFamily { get; set; }
 

Microsoft.Toolkit.Uwp.UI/Extensions/Markup/FontIconSourceExtension.cs

@@ -20,7 +20,7 @@ public class FontIconSourceExtension : TextIconExtension
         public string Glyph { get; set; }
 
         /// <summary>
-        /// Gets or sets the font family to use to display the icon. If <see langword="null"/>, "Segoe MDL2 Assets" will be used.
+        /// Gets or sets the font family to use to display the icon. If <see langword="null"/>, "Segoe Fluent Icons,Segoe MDL2 Assets" will be used.
         /// </summary>
         public FontFamily FontFamily { get; set; }
 

UnitTests/UnitTests.UWP/Extensions/Test_FontIconExtensionMarkupExtension.cs

@@ -17,7 +17,7 @@ public class Test_FontIconExtensionMarkupExtension
     {
         [TestCategory("FontIconExtensionMarkupExtension")]
         [UITestMethod]
-        public void Test_FontIconExtension_MarkupExtension_ProvideSegoeMdl2Asset()
+        public void Test_FontIconExtension_MarkupExtension_ProvideSymbolThemeFont()
         {
             var treeroot = XamlReader.Load(@"<Page
     xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation""
@@ -35,7 +35,7 @@ public void Test_FontIconExtension_MarkupExtension_ProvideSegoeMdl2Asset()
             Assert.IsNotNull(icon, $"Could not find the {nameof(FontIcon)} element in button.");
 
             Assert.AreEqual(icon.Glyph, "\uE105", "Expected icon glyph to be E105.");
-            Assert.AreEqual(icon.FontFamily.Source, "Segoe MDL2 Assets", "Expected font family to be Segoe MDL2 Assets");
+            Assert.AreEqual(icon.FontFamily.Source, "Segoe Fluent Icons,Segoe MDL2 Assets", "Expected font family to be \"Segoe Fluent Icons,Segoe MDL2 Assets\"");
         }
 
         [TestCategory("FontIconExtensionMarkupExtension")]

UnitTests/UnitTests.UWP/Extensions/Test_FontIconSourceExtensionMarkupExtension.cs

@@ -18,7 +18,7 @@ public class Test_FontIconSourceExtensionMarkupExtension
     {
         [TestCategory("FontIconSourceExtensionMarkupExtension")]
         [UITestMethod]
-        public void Test_FontIconSourceExtension_MarkupExtension_ProvideSegoeMdl2Asset()
+        public void Test_FontIconSourceExtension_MarkupExtension_ProvideSymbolThemeFont()
         {
             var treeRoot = XamlReader.Load(@"<Page
     xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation""
@@ -37,7 +37,7 @@ public void Test_FontIconSourceExtension_MarkupExtension_ProvideSegoeMdl2Asset()
             Assert.IsNotNull(icon, $"Could not find the {nameof(FontIcon)} element in button.");
 
             Assert.AreEqual(icon.Glyph, "\uE105", "Expected icon glyph to be E105.");
-            Assert.AreEqual(icon.FontFamily.Source, "Segoe MDL2 Assets", "Expected font family to be Segoe MDL2 Assets");
+            Assert.AreEqual(icon.FontFamily.Source, "Segoe Fluent Icons,Segoe MDL2 Assets", "Expected font family to be \"Segoe Fluent Icons,Segoe MDL2 Assets\"");
         }
 
         [TestCategory("FontIconSourceExtensionMarkupExtension")]