2 files changed, 80 insertions, 0 deletions
diff --git a/dom/serviceworkers/test/download/window.html b/dom/serviceworkers/test/download/window.html
new file mode 100644
index 0000000000..7d7893e0e6
--- /dev/null
+++ b/dom/serviceworkers/test/download/window.html
@@ -0,0 +1,46 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+</head>
+<body>
+<script type="text/javascript">
+
+function wait_until_controlled() {
+  return new Promise(function(resolve) {
+    if (navigator.serviceWorker.controller) {
+      return resolve();
+    }
+    navigator.serviceWorker.addEventListener('controllerchange', function onController() {
+      if (navigator.serviceWorker.controller) {
+        navigator.serviceWorker.removeEventListener('controllerchange', onController);
+        return resolve();
+      }
+    });
+  });
+}
+addEventListener('load', function(event) {
+  var registration;
+  navigator.serviceWorker.register('worker.js').then(function(swr) {
+    registration = swr;
+
+    // While the iframe below is a navigation, we still wait until we are
+    // controlled here.  We want an active client to hold the service worker
+    // alive since it calls unregister() on itself.
+    return wait_until_controlled();
+
+  }).then(function() {
+    var frame = document.createElement('iframe');
+    document.body.appendChild(frame);
+    frame.src = 'fake_download';
+
+    // The service worker is unregistered in the fetch event.  The window and
+    // frame are cleaned up from the browser chrome script.
+  });
+});
+</script>
+</body>
+</html>
diff --git a/dom/serviceworkers/test/download/worker.js b/dom/serviceworkers/test/download/worker.js
new file mode 100644
index 0000000000..d96f18b34d
--- /dev/null
+++ b/dom/serviceworkers/test/download/worker.js
@@ -0,0 +1,34 @@
+addEventListener("install", function (evt) {
+  evt.waitUntil(self.skipWaiting());
+});
+
+addEventListener("activate", function (evt) {
+  // We claim the current clients in order to ensure that we have an
+  // active client when we call unregister in the fetch handler.  Otherwise
+  // the unregister() can kill the current worker before returning a
+  // response.
+  evt.waitUntil(clients.claim());
+});
+
+addEventListener("fetch", function (evt) {
+  // This worker may live long enough to receive a fetch event from the next
+  // test.  Just pass such requests through to the network.
+  if (!evt.request.url.includes("fake_download")) {
+    return;
+  }
+
+  // We should only get a single download fetch event. Automatically unregister.
+  evt.respondWith(
+    registration.unregister().then(function () {
+      return new Response("service worker generated download", {
+        headers: {
+          "Content-Disposition": 'attachment; filename="fake_download.bin"',
+          // Prevent the default text editor from being launched
+          "Content-Type": "application/octet-stream",
+          // fake encoding header that should have no effect
+          "Content-Encoding": "gzip",
+        },
+      });
+    })
+  );
+});