Bug 1147699 - Part 5: Add a test for FetchEvent.request.context when intercepting an audio element load; r=nsm

dom/workers/test/serviceworkers/fetch/context/context_test.js

@@ -16,6 +16,10 @@ self.addEventListener("fetch", function(event) {
     if (event.request.context == "imageset") {
       event.respondWith(fetch("realimg.jpg"));
     }
+  } else if (event.request.url.indexOf("audio.ogg") >= 0) {
+    if (event.request.context == "audio") {
+      event.respondWith(fetch("realaudio.ogg"));
+    }
   }
   // Fail any request that we don't know about.
   try {

dom/workers/test/serviceworkers/fetch/context/index.html

@@ -58,11 +58,25 @@
     });
   }
 
+  function testAudio() {
+    return new Promise(function(resolve, reject) {
+      var audio = document.createElement("audio");
+      audio.src = "audio.ogg";
+      audio.preload = "metadata";
+      // The service worker will respond with an existing audio only if the
+      // Request has the correct context, otherwise the Promise will get
+      // rejected and the test will fail.
+      audio.onloadedmetadata = resolve;
+      audio.onerror = reject;
+    });
+  }
+
   Promise.all([
     testFetch(),
     testImage(),
     testImageSrcSet(),
     testPicture(),
+    testAudio(),
   ])
   .then(function() {
     finish();

dom/workers/test/serviceworkers/mochitest.ini

@@ -31,6 +31,7 @@ support-files =
   fetch/context/unregister.html
   fetch/context/context_test.js
   fetch/context/realimg.jpg
+  fetch/context/realaudio.ogg
   fetch/https/index.html
   fetch/https/register.html
   fetch/https/unregister.html