Add some more specific tests (#2573)

These tests are loading a custom typeface from a file and assigned to the paint and font Typeface properties. This is to ensure nothing obvious is going wrong.

Related to #2572

tests/Tests/SkiaSharp/SKFontTest.cs

@@ -1,4 +1,5 @@
 using System;
+using System.IO;
 using System.Linq;
 using Xunit;
 
@@ -473,5 +474,26 @@ public void BreakTextHasCorrectLogic(int textSize)
 				mm = m;
 			}
 		}
+
+		[SkippableTheory]
+		[InlineData("CourierNew.ttf")]
+		[InlineData("Distortable.ttf")]
+		[InlineData("Funkster.ttf")]
+		[InlineData("HangingS.ttf")]
+		[InlineData("ReallyBigA.ttf")]
+		[InlineData("Roboto.woff2")]
+		[InlineData("RobotoMono.woff2")]
+		[InlineData("Roboto2-Regular_NoEmbed.ttf")]
+		[InlineData("segoeui.ttf")]
+		[InlineData("上田雅美.ttf")]
+		public void CanSetTypefacesWithoutCrashing(string fontfile)
+		{
+			using var font = new SKFont();
+
+			using var typeface = SKTypeface.FromFile(Path.Combine(PathToFonts, fontfile));
+			font.Typeface = typeface;
+
+			Assert.Same(typeface, font.Typeface);
+		}
 	}
 }

tests/Tests/SkiaSharp/SKPaintTest.cs

@@ -698,5 +698,27 @@ public void PaintWithAliasEdgingIsPreserved()
 			Assert.True(paint.IsAntialias);
 			Assert.Equal(SKFontEdging.Antialias, paint.GetFont().Edging);
 		}
+
+		[Obsolete]
+		[SkippableTheory]
+		[InlineData("CourierNew.ttf")]
+		[InlineData("Distortable.ttf")]
+		[InlineData("Funkster.ttf")]
+		[InlineData("HangingS.ttf")]
+		[InlineData("ReallyBigA.ttf")]
+		[InlineData("Roboto.woff2")]
+		[InlineData("RobotoMono.woff2")]
+		[InlineData("Roboto2-Regular_NoEmbed.ttf")]
+		[InlineData("segoeui.ttf")]
+		[InlineData("上田雅美.ttf")]
+		public void CanSetTypefacesWithoutCrashing(string fontfile)
+		{
+			using var paint = new SKPaint();
+
+			using var typeface = SKTypeface.FromFile(Path.Combine(PathToFonts, fontfile));
+			paint.Typeface = typeface;
+
+			Assert.Same(typeface, paint.Typeface);
+		}
 	}
 }