content: test for multiple codepoint unicode emoji

Author: rajveermalviya

test/model/content_test.dart

@@ -145,6 +145,11 @@ void main() {
     '<p><span aria-label="thumbs up" class="emoji emoji-1f44d" role="img" title="thumbs up">:thumbs_up:</span></p>',
     const UnicodeEmojiNode(unicode: '\u{1f44d}'));
 
+  testParseInline('parse Unicode emoji, encoded in span element, multiple codepoints',
+    // ":transgender_flag:"
+    '<p><span aria-label="transgender flag" class="emoji emoji-1f3f3-fe0f-200d-26a7-fe0f" role="img" title="transgender flag">:transgender_flag:</span></p>',
+    const UnicodeEmojiNode(unicode: '\u{1f3f3}\u{fe0f}\u{200d}\u{26a7}\u{fe0f}'));
+
   testParseInline('parse Unicode emoji, not encoded in span element',
     // "🪿"
     '<p>🪿</p>',

test/widgets/content_test.dart

@@ -176,6 +176,14 @@ void main() {
       expect(find.text('\u{1f44d}'), findsOneWidget); // "👍"
     });
 
+    testWidgets('encoded emoji span, with emoji name, ', (tester) async {
+      await prepareContent(tester,
+        // ":transgender_flag:"
+        '<p><span aria-label="transgender flag" class="emoji emoji-1f3f3-fe0f-200d-26a7-fe0f" role="img" title="transgender flag">:transgender_flag:</span></p>');
+
+      expect(find.text('\u{1f3f3}\u{fe0f}\u{200d}\u{26a7}\u{fe0f}'), findsOneWidget); // "🏳️‍⚧️"
+    });
+
     testWidgets('non encoded emoji', (tester) async {
       await prepareContent(tester,
         // "🪿"