Update NameToUnicodeConvertAglSpecification to test what was intended

src/UglyToad.PdfPig.Tests/Fonts/Encodings/GlyphListTests.cs

@@ -1,5 +1,6 @@
 namespace UglyToad.PdfPig.Tests.Fonts.Encodings
 {
+    using System.Text;
     using PdfPig.Fonts;
 
     public class GlyphListTests
@@ -92,7 +93,7 @@
         }
 
 
-        [Fact(Skip = "TODO - String don't match")]
+        [Fact]
         public void NameToUnicodeConvertAglSpecification()
         {
             // https://github.com/adobe-type-tools/agl-specification?tab=readme-ov-file#3-examples
@@ -103,7 +104,22 @@
 
             var result = list.NameToUnicode("Lcommaaccent_uni20AC0308_u1040C.alternate");
 
-            Assert.Equal("\u013B\u20AC\u0308\u1040C", result);
+            // This value is not encodable in single characters in UTF-16, so we get a surrogate pair for the final unicode character
+            Assert.Equal("\u013B\u20AC\u0308\uD801\uDC0C", result);
+
+#if NET6_0_OR_GREATER
+            // But in .Net we can get the unicode rune values to verify that this is really the expected value
+            var runes = result.EnumerateRunes().ToList();
+
+            Assert.Equal(4, runes.Count);
+
+            Assert.Equal(0x013B, runes[0].Value);
+            Assert.Equal(0x20AC, runes[1].Value);
+            Assert.Equal(0x0308, runes[2].Value);
+            Assert.Equal(0x1040C, runes[3].Value);
+#endif
+            // Ok, so we know this is what the actual string is. Now lets encode that last value the C# way
+            Assert.Equal("\u013B\u20AC\u0308\U0001040C", result);
         }
     }
 }