chore(scoped-custom-elements-registry): address code review by adding tests and updating the CHANGELOG

Author: calebdwilliams

packages/scoped-custom-element-registry/CHANGELOG.md

@@ -5,7 +5,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-<!-- ## Unreleased -->
+## Unreleased
+
+### Fixed
+
+- Polyfilled ElementInternals prototype methods now return their original value.
 
 # [0.0.5] - 2022-02-18
 

packages/scoped-custom-element-registry/package-lock.json

@@ -99,4 +99,22 @@ export const commonRegistryTests = (registry) => {
       expect(form.elements.length).to.equal(0);
     });
   });
+
+  describe('ElementInternals prototype method overrides', () => {
+    it('will still return the appropriate values', () => {
+      const {tagName, CustomElementClass} = getFormAssociatedTestElement();
+      registry.define(tagName, CustomElementClass);
+
+      const form = document.createElement('form');
+      const element = new CustomElementClass();
+
+      form.append(element);
+
+      expect(element.internals.checkValidity()).to.be.true;
+
+      element.internals.setValidity({valueMissing: true}, 'Test');
+
+      expect(element.internals.checkValidity()).to.be.false;
+    });
+  });
 };