Bug 2001295 [wpt PR 56132] - CustomElementRegistry.prototype.initialize upgrades already initialized elements, a=testonly

Automatic update from web-platform-tests
CustomElementRegistry.prototype.initialize upgrades already initialized elements

For whatwg/html#11913.
--

wpt-commits: ba9d85e81e45978e36b8d4b26b7a91e65383b296
wpt-pr: 56132

Author: annevk

testing/web-platform/tests/custom-elements/registries/scoped-registry-initialize-upgrades.html

@@ -18,7 +18,7 @@
         assert_equals(element.customElementRegistry, null);
         registry.initialize(element);
         assert_equals(element.customElementRegistry, registry);
-    }, `${title}: customElementRegistry.prototype.initialize should upgrade the element given to the first argument`);
+    }, `${title}: CustomElementRegistry.prototype.initialize should upgrade the element given to the first argument`);
 
     test(() => {
         const doc = makeDocument();
@@ -49,7 +49,7 @@
         assert_equals(registryInConstructor.length, 2);
         assert_equals(registryInConstructor[0], registry);
         assert_equals(registryInConstructor[1], registry);
-    }, `${title}: customElementRegistry.prototype.initialize should upgrade elements in tree order`);
+    }, `${title}: CustomElementRegistry.prototype.initialize should upgrade elements in tree order`);
 
     test(() => {
         const doc1 = makeDocument();
@@ -78,13 +78,33 @@
         assert_true(undefinedElement1 instanceof ABElement);
         assert_equals(undefinedElement2.customElementRegistry, registry2);
         assert_equals(undefinedElement2.__proto__.constructor.name, 'HTMLElement');
-    }, `${title}: customElementRegistry.prototype.initialize only upgrades elements beloning to the registry`);
+    }, `${title}: CustomElementRegistry.prototype.initialize only upgrades elements beloning to the registry`);
 }
 
 runTest('Document', () => new Document);
 runTest('HTMLDocument', () => document.implementation.createHTMLDocument());
 runTest('XHTMLDocument', () => document.implementation.createDocument('http://www.w3.org/1999/xhtml', 'html', null));
 
+test(() => {
+    class ABElement extends HTMLElement { };
+    const registry = new CustomElementRegistry;
+
+    const element = document.createElement('a-b', { customElementRegistry: registry });
+    assert_equals(element.customElementRegistry, registry);
+    assert_equals(element.__proto__.constructor.name, 'HTMLElement');
+    assert_false(element instanceof ABElement);
+
+    registry.define('a-b', ABElement);
+    assert_equals(element.customElementRegistry, registry);
+    assert_equals(element.__proto__.constructor.name, 'HTMLElement');
+    assert_false(element instanceof ABElement);
+
+    registry.initialize(element);
+    assert_equals(element.customElementRegistry, registry);
+    assert_equals(element.__proto__.constructor.name, 'ABElement');
+    assert_true(element instanceof ABElement);
+}, `CustomElementRegistry.prototype.initialize upgrades already initialized elements`);
+
 </script>
 </body>
 </html>