1 files changed, 20 insertions, 0 deletions
diff --git a/dom/serviceworkers/test/serviceworker_not_sharedworker.js b/dom/serviceworkers/test/serviceworker_not_sharedworker.js
new file mode 100644
index 0000000000..da0c98aea3
--- /dev/null
+++ b/dom/serviceworkers/test/serviceworker_not_sharedworker.js
@@ -0,0 +1,20 @@
+function OnMessage(e) {
+  if (e.data.msg == "whoareyou") {
+    if ("ServiceWorker" in self) {
+      self.clients.matchAll().then(function (clients) {
+        clients[0].postMessage({ result: "serviceworker" });
+      });
+    } else {
+      port.postMessage({ result: "sharedworker" });
+    }
+  }
+}
+
+var port;
+onconnect = function (e) {
+  port = e.ports[0];
+  port.onmessage = OnMessage;
+  port.start();
+};
+
+onmessage = OnMessage;