1 files changed, 7 insertions, 0 deletions
diff --git a/web_src/js/webcomponents/polyfill.test.ts b/web_src/js/webcomponents/polyfill.test.ts
new file mode 100644
index 0000000000..4fb4621547
--- /dev/null
+++ b/web_src/js/webcomponents/polyfill.test.ts
@@ -0,0 +1,7 @@
+import {weakRefClass} from './polyfills.ts';
+
+test('polyfillWeakRef', () => {
+  const WeakRef = weakRefClass();
+  const r = new WeakRef(123);
+  expect(r.deref()).toEqual(123);
+});