1 files changed, 13 insertions, 0 deletions
diff --git a/testing/web-platform/tests/workers/constructors/SharedWorker/interface-objects.js b/testing/web-platform/tests/workers/constructors/SharedWorker/interface-objects.js
new file mode 100644
index 0000000000..2a7aaee687
--- /dev/null
+++ b/testing/web-platform/tests/workers/constructors/SharedWorker/interface-objects.js
@@ -0,0 +1,13 @@
+let prt;
+const handleCall = e => {
+  const log = [];
+  for (let i = 0; i < e.data.length; ++i) {
+    if (!(e.data[i] in self))
+      log.push(e.data[i]);
+  }
+  prt.postMessage('These were missing: '+log.join(', '));
+};
+onconnect = e => {
+  prt = e.ports[0];
+  prt.onmessage = handleCall;
+};