Use a different arabic font for tests

tests/Avalonia.Skia.UnitTests/Media/CustomFontManagerImpl.cs

@@ -16,7 +16,7 @@ namespace Avalonia.Skia.UnitTests.Media
         private readonly Typeface _defaultTypeface =
             new Typeface("resm:Avalonia.Skia.UnitTests.Assets?assembly=Avalonia.Skia.UnitTests#Noto Mono");
         private readonly Typeface _arabicTypeface =
-           new Typeface("resm:Avalonia.Skia.UnitTests.Assets?assembly=Avalonia.Skia.UnitTests#Noto Kufi Arabic");
+           new Typeface("resm:Avalonia.Skia.UnitTests.Assets?assembly=Avalonia.Skia.UnitTests#Noto Sans Arabic");
         private readonly Typeface _italicTypeface =
             new Typeface("resm:Avalonia.Skia.UnitTests.Assets?assembly=Avalonia.Skia.UnitTests#Noto Sans", FontStyle.Italic);
         private readonly Typeface _emojiTypeface =
@@ -82,6 +82,12 @@ namespace Avalonia.Skia.UnitTests.Media
                         skTypeface = typefaceCollection.Get(typeface);
                         break;
                     }
+                case "Noto Sans Arabic":
+                    {
+                        var typefaceCollection = SKTypefaceCollectionCache.GetOrAddTypefaceCollection(_arabicTypeface.FontFamily);
+                        skTypeface = typefaceCollection.Get(typeface);
+                        break;
+                    }
                 case FontFamily.DefaultFontFamilyName:
                 case "Noto Mono":
                     {

tests/Avalonia.Skia.UnitTests/Media/TextFormatting/TextLayoutTests.cs

@@ -1005,7 +1005,7 @@ namespace Avalonia.Skia.UnitTests.Media.TextFormatting
 
                         var distance = textLine.GetDistanceFromCharacterHit(new CharacterHit(cluster));
 
-                        Assert.Equal(currentX, distance, 5);
+                        Assert.Equal(currentX, distance);
 
                         currentX += glyphAdvance;