Added a test for SKFontManager.MatchCharacter

binding/Binding/SKFontManager.cs

@@ -92,6 +92,12 @@ namespace SkiaSharp
 		
 		public SKTypeface MatchCharacter (string familyName, int weight, int width, SKFontStyleSlant slant, string[] bcp47, int character)
 		{
+			// TODO: work around for https://bugs.chromium.org/p/skia/issues/detail?id=6196
+			if (familyName == null)
+			{
+				familyName = string.Empty;
+			}
+
 			return GetObject<SKTypeface> (SkiaApi.sk_fontmgr_match_family_style_character (Handle, familyName, weight, width, slant, bcp47, bcp47?.Length ?? 0, character));
 		}
 	}

samples/SkiaSharpSample.Shared/Samples/UnicodeTextSample.cs

@@ -27,7 +27,7 @@ namespace SkiaSharpSample.Samples
 			using (var courier = SKTypeface.FromFamilyName("Courier New"))
 			{
 				paint.Typeface = courier;
-				canvas.DrawText("'A' and 'ݐ' and '年'", 40, 100, paint);
+				canvas.DrawText("'A', 'ݐ', '年'", 40, 100, paint);
 			}
 
 			// the font manager finds fonts
@@ -38,7 +38,7 @@ namespace SkiaSharpSample.Samples
 			using (var courier = fontManager.MatchCharacter("Courier New", 'ݐ'))
 			{
 				paint.Typeface = courier;
-				canvas.DrawText("'A' and 'ݐ' and '年'", 40, 200, paint);
+				canvas.DrawText("'A', 'ݐ', '年'", 40, 200, paint);
 			}
 
 			// if we know the font doesn't have the character, or don't want to fall back
@@ -46,7 +46,7 @@ namespace SkiaSharpSample.Samples
 			using (var courier = SKTypeface.FromFamilyName("Courier New"))
 			using (var japanese = fontManager.MatchCharacter("Courier New", '年'))
 			{
-				var first = "'A' and 'ݐ' and '";
+				var first = "'A', 'ݐ', '";
 				var mid = "年";
 				var last = "'";
 
@@ -73,7 +73,7 @@ namespace SkiaSharpSample.Samples
 			using (var emoji = fontManager.MatchCharacter(emojiChar))
 			{
 				paint.Typeface = emoji;
-				canvas.DrawText("🌐  🍪  🍕  🚀", 40, 400, paint);
+				canvas.DrawText("🌐 🍪 🍕 🚀", 40, 400, paint);
 			}
 		}
 	}

tests/Tests/SKTypefaceTest.cs

@@ -97,6 +97,23 @@ namespace SkiaSharp.Tests
 			}
 		}
 
+		[Fact]
+		public void TestFontManagerMatchCharacter()
+		{
+			var fonts = SKFontManager.Default;
+			var emoji = "🚀";
+			var emojiChar = StringUtilities.GetUnicodeCharacterCode(emoji, SKTextEncoding.Utf32);
+			using (var typeface = fonts.MatchCharacter(emojiChar))
+			{
+				if (IsLinux)
+					Assert.Equal("", typeface.FamilyName);  // see issue #225
+				else if (IsMac)
+					Assert.Equal("Apple Color Emoji", typeface.FamilyName);
+				else if (IsWindows)
+					Assert.Equal("Segoe UI Emoji", typeface.FamilyName);
+			}
+		}
+
 		[Fact]
 		public void ExceptionInInvalidGetTableData()
 		{