1 files changed, 8 insertions, 0 deletions
diff --git a/dom/serviceworkers/test/message_posting_worker.js b/dom/serviceworkers/test/message_posting_worker.js
new file mode 100644
index 0000000000..5fcd0a741e
--- /dev/null
+++ b/dom/serviceworkers/test/message_posting_worker.js
@@ -0,0 +1,8 @@
+onmessage = function (e) {
+  self.clients.matchAll().then(function (res) {
+    if (!res.length) {
+      dump("ERROR: no clients are currently controlled.\n");
+    }
+    res[0].postMessage(e.data);
+  });
+};