1 files changed, 19 insertions, 0 deletions
diff --git a/dom/workers/test/serviceworkers/unresolved_fetch_worker.js b/dom/workers/test/serviceworkers/unresolved_fetch_worker.js
new file mode 100644
index 000000000..71fbad781
--- /dev/null
+++ b/dom/workers/test/serviceworkers/unresolved_fetch_worker.js
@@ -0,0 +1,19 @@
+var keepPromiseAlive;
+onfetch = function(event) {
+  event.waitUntil(
+    clients.matchAll()
+           .then(clients => {
+             clients.forEach(client => {
+               client.postMessage("continue");
+             });
+           })
+  );
+
+  // Never resolve, and keep it alive on our global so it can't get GC'ed and
+  // make this test weird and intermittent.
+  event.respondWith((keepPromiseAlive = new Promise(function(res, rej) {})));
+}
+
+onactivate = function(event) {
+  event.waitUntil(clients.claim());
+}