diff -r 000000000000 -r 6474c204b198 toolkit/components/downloads/test/unit/test_offline_support.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/downloads/test/unit/test_offline_support.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,159 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Test bug 437415 by making sure the download manager responds to offline and
+ * online notifications by pausing and resuming downloads.
+ */
+
+/**
+ * Used to indicate if we should error out or not.  See bug 431745 for more
+ * details.
+ */
+let doNotError = false;
+
+const nsIF = Ci.nsIFile;
+const nsIDM = Ci.nsIDownloadManager;
+const nsIWBP = Ci.nsIWebBrowserPersist;
+const nsIWPL = Ci.nsIWebProgressListener;
+const dm = Cc["@mozilla.org/download-manager;1"].getService(nsIDM);
+if (!oldDownloadManagerDisabled()) {
+  dm.cleanUp();
+}
+
+function setOnlineState(aOnline)
+{
+  // We do not actually set the offline state because that introduces some neat
+  // conditions when being called within a listener.  We do dispatch the right
+  // observer topics though, so this tests just the download manager.
+  let topic = aOnline ?
+    "network:offline-status-changed" :
+    "network:offline-about-to-go-offline";
+  let state = aOnline ? "online" : "offline";
+  Cc["@mozilla.org/observer-service;1"].
+  getService(Ci.nsIObserverService).
+  notifyObservers(null, topic, state);
+}
+
+function run_test()
+{
+  if (oldDownloadManagerDisabled()) {
+    return;
+  }
+
+  /**
+   * 1. Create data for http server to send
+   */
+  // data starts at 10 bytes
+  let data = "1234567890";
+  // data * 10^4 = 100,000 bytes (actually 101,111 bytes with newline)
+  for (let i = 0; i < 4; i++)
+    data = [data,data,data,data,data,data,data,data,data,data,"\n"].join("");
+
+  /**
+   * 2. Start the http server that can handle resume
+   */
+  let httpserv = new HttpServer();
+  let didResumeServer = false;
+  httpserv.registerPathHandler("/resume", function(meta, resp) {
+    let body = data;
+    resp.setHeader("Content-Type", "text/html", false);
+    if (meta.hasHeader("Range")) {
+      // track that we resumed for testing
+      didResumeServer = true;
+      // Syntax: bytes=[from]-[to] (we don't support multiple ranges)
+      let matches = meta.getHeader("Range").match(/^\s*bytes=(\d+)?-(\d+)?\s*$/);
+      let from = (matches[1] === undefined) ? 0 : matches[1];
+      let to = (matches[2] === undefined) ? data.length - 1 : matches[2];
+      if (from >= data.length) {
+        resp.setStatusLine(meta.httpVersion, 416, "Start pos too high");
+        resp.setHeader("Content-Range", "*/" + data.length);
+        dump("Returning early - from >= data.length.  Not an error (bug 431745)\n");
+        doNotError = true;
+        return;
+      }
+      body = body.substring(from, to + 1);
+      // always respond to successful range requests with 206
+      resp.setStatusLine(meta.httpVersion, 206, "Partial Content");
+      resp.setHeader("Content-Range", from + "-" + to + "/" + data.length);
+    }
+    resp.bodyOutputStream.write(body, body.length);
+  });
+  httpserv.start(-1);
+
+  /**
+   * 3. Perform various actions for certain download states
+   */
+  let didPause = false;
+  let didResumeDownload = false;
+  dm.addListener({
+    onDownloadStateChange: function(a, aDl) {
+      if (aDl.state == nsIDM.DOWNLOAD_DOWNLOADING && !didPause) {
+        /**
+         * (1) queued -> downloading = pause the download by going offline
+         */
+        setOnlineState(false);
+      } else if (aDl.state == nsIDM.DOWNLOAD_PAUSED) {
+        /**
+         * (2) downloading -> paused
+         */
+        didPause = true;
+      } else if (aDl.state == nsIDM.DOWNLOAD_FINISHED) {
+        /**
+         * (4) downloading (resumed) -> finished = check tests
+         */
+        // did we pause at all?
+        do_check_true(didPause);
+        // did we real-resume and not fake-resume?
+        do_check_true(didResumeDownload);
+        // extra real-resume check for the server
+        do_check_true(didResumeServer);
+
+        httpserv.stop(do_test_finished);
+        aDl.targetFile.remove(false);
+      }
+      else if (aDl.state == nsIDM.DOWNLOAD_FAILED) {
+        // this is only ok if we are not supposed to fail
+        do_check_true(doNotError);
+        httpserv.stop(do_test_finished);
+      }
+    },
+    onStateChange: function(a, b, aState, d, aDl) {
+      if ((aState & nsIWPL.STATE_STOP) && didPause && !didResumeServer &&
+          !didResumeDownload) {
+        /**
+         * (3) paused -> stopped = resume the download by coming online
+         */
+        setOnlineState(true);
+        didResumeDownload = true;
+      }
+    },
+    onProgressChange: function(a, b, c, d, e, f, g) { },
+    onSecurityChange: function(a, b, c, d) { }
+  });
+  dm.addListener(getDownloadListener());
+
+  /**
+   * 4. Start the download
+   */
+  let destFile = dirSvc.get("ProfD", nsIF);
+  destFile.append("offline_online");
+  if (destFile.exists())
+    destFile.remove(false);
+  let persist = Cc["@mozilla.org/embedding/browser/nsWebBrowserPersist;1"].
+                createInstance(nsIWBP);
+  persist.persistFlags = nsIWBP.PERSIST_FLAGS_REPLACE_EXISTING_FILES |
+                         nsIWBP.PERSIST_FLAGS_BYPASS_CACHE |
+                         nsIWBP.PERSIST_FLAGS_AUTODETECT_APPLY_CONVERSION;
+  let dl = dm.addDownload(nsIDM.DOWNLOAD_TYPE_DOWNLOAD,
+                          createURI("http://localhost:" +
+                                    httpserv.identity.primaryPort + "/resume"),
+                          createURI(destFile), null, null,
+                          Math.round(Date.now() * 1000), null, persist, false);
+  persist.progressListener = dl.QueryInterface(nsIWPL);
+  persist.saveURI(dl.source, null, null, null, null, dl.targetFile, null);
+
+  // Mark as pending, so clear this when we actually finish the download
+  do_test_pending();
+}