LibWeb: Add simple named character reference test to TestHTMLTokenizer

Author: https://github.com/squeek502
Commit: 1fd0bf9feb
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5296
Reviewed-by: https://github.com/gmta ✅

Tests/LibWeb/TestHTMLTokenizer.cpp

@@ -199,6 +199,19 @@ TEST_CASE(character_reference_in_attribute)
     END_ENUMERATION();
 }
 
+TEST_CASE(named_character_reference)
+{
+    auto tokens = run_tokenizer("⋶&notit;&cz"sv);
+    BEGIN_ENUMERATION(tokens);
+    EXPECT_CHARACTER_TOKEN(0x22F6); // ⋶
+    EXPECT_CHARACTER_TOKEN(0xAC);   // &not (backtracked from &notit)
+    EXPECT_CHARACTER_TOKENS(it);
+    EXPECT_CHARACTER_TOKEN(';');
+    EXPECT_CHARACTER_TOKENS(&cz); // invalid
+    EXPECT_END_OF_FILE_TOKEN();
+    END_ENUMERATION();
+}
+
 TEST_CASE(numeric_character_reference)
 {
     auto tokens = run_tokenizer("&#1111"sv);