1 files changed, 28 insertions, 0 deletions
diff --git a/dom/tests/mochitest/fetch/nested_worker_wrapper.js b/dom/tests/mochitest/fetch/nested_worker_wrapper.js
new file mode 100644
index 000000000..7e463e7df
--- /dev/null
+++ b/dom/tests/mochitest/fetch/nested_worker_wrapper.js
@@ -0,0 +1,28 @@
+// Hold the nested worker alive until this parent worker closes.
+var worker;
+
+addEventListener('message', function nestedWorkerWrapperOnMessage(evt) {
+  removeEventListener('message', nestedWorkerWrapperOnMessage);
+
+  worker = new Worker('worker_wrapper.js');
+
+  worker.addEventListener('message', function(evt) {
+    self.postMessage({
+      context: 'NestedWorker',
+      type: evt.data.type,
+      status: evt.data.status,
+      msg: evt.data.msg,
+    });
+  });
+
+  worker.addEventListener('error', function(evt) {
+    self.postMessage({
+      context: 'NestedWorker',
+      type: 'status',
+      status: false,
+      msg: 'Nested worker error: ' + evt.message,
+    });
+  });
+
+  worker.postMessage(evt.data);
+});