Test fails because of PHP bug

lib/Document.php

@@ -156,7 +156,7 @@ class Document extends \DOMDocument {
     }
 
 
-    public function createAttribute($localName): \DOMAttr {
+    public function createAttribute($localName) {
         # The createAttribute(localName) method steps are:
         # 1. If localName does not match the Name production in XML, then throw an
         #    "InvalidCharacterError" DOMException.
@@ -174,12 +174,12 @@ class Document extends \DOMDocument {
         // We need to do a couple more things here. PHP's XML-based DOM doesn't allow
         // some characters. We have to coerce them sometimes.
         try {
-            return parent::createAttributeNS(null, $localName);
+            return @parent::createAttributeNS(null, $localName);
         } catch (\DOMException $e) {
             // The element name is invalid for XML
             // Replace any offending characters with "UHHHHHH" where H are the
             //   uppercase hexadecimal digits of the character's code point
-            return parent::createAttributeNS(null, $this->coerceName($localName));
+            return @parent::createAttributeNS(null, $this->coerceName($localName));
         }
     }
 
@@ -210,7 +210,7 @@ class Document extends \DOMDocument {
             // way to avoid this other than allowing this method to return Attr|false. Since
             // this library supports PHP 7.4 we cannot denote this in the method's
             // signature.
-            return parent::createAttributeNS($namespace, $qualifiedName);
+            return @parent::createAttributeNS($namespace, $qualifiedName);
         }
     }
 

tests/cases/TestElement.php

@@ -10,10 +10,7 @@ namespace MensBeam\HTML\DOM\TestCase;
 
 use MensBeam\HTML\DOM\{
     Document,
-    DOMException,
-    Element,
-    ElementMap,
-    HTMLTemplateElement
+    DOMException
 };
 use MensBeam\HTML\Parser;
 

tests/cases/TestTokenList.php

@@ -0,0 +1,27 @@
+<?php
+/**
+ * @license MIT
+ * Copyright 2017, Dustin Wilson, J. King et al.
+ * See LICENSE and AUTHORS files for details
+ */
+
+declare(strict_types=1);
+namespace MensBeam\HTML\DOM\TestCase;
+
+use MensBeam\HTML\DOM\{
+    Document,
+    DOMException
+};
+use MensBeam\HTML\Parser;
+
+
+/** @covers \MensBeam\HTML\DOM\TokenList */
+class TestTokenList extends \PHPUnit\Framework\TestCase {
+    /** @covers \MensBeam\HTML\DOM\TokenList::__get_length */
+    public function testPropertyGetLength(): void {
+        $d = new Document();
+        $e = $d->createElement('html');
+        $e->classList->add('ook', 'eek', 'ack', 'ookeek');
+        $this->assertSame(4, $e->classList->length);
+    }
+}

tests/phpunit.dist.xml

@@ -26,6 +26,7 @@
       <file>cases/TestMoonwalk.php</file>
       <file>cases/TestNode.php</file>
       <file>cases/TestParentNode.php</file>
+      <file>cases/TestTokenList.php</file>
       <file>cases/TestWalk.php</file>
     </testsuite>
     <testsuite name="Serializer">