1 files changed, 7 insertions, 0 deletions
diff --git a/testing/web-platform/tests/workers/support/Worker-postMessage-happens-in-parallel.js b/testing/web-platform/tests/workers/support/Worker-postMessage-happens-in-parallel.js
new file mode 100644
index 0000000000..48b4c34fe3
--- /dev/null
+++ b/testing/web-platform/tests/workers/support/Worker-postMessage-happens-in-parallel.js
@@ -0,0 +1,7 @@
+onmessage = (e) => {
+  if (e.data == 'init') {
+    postMessage(0);
+  } else {
+    e.data[0] = 1;
+  }
+}