diff -r 000000000000 -r 6474c204b198 netwerk/test/unit/test_bug263127.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/netwerk/test/unit/test_bug263127.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,61 @@
+Cu.import("resource://testing-common/httpd.js");
+
+var server;
+const BUGID = "263127";
+
+var listener = {
+  QueryInterface: function(iid) {
+    if (!iid.equals(nsIDownloadObserver) &&
+        !iid.equals(nsISupports))
+      throw Components.results.NS_ERROR_NO_INTERFACE;
+
+    return this;
+  },
+
+  onDownloadComplete: function(downloader, request, ctxt, status, file) {
+    do_test_pending();
+    server.stop(do_test_finished);
+
+    if (!file)
+      do_throw("Download failed");
+
+    try {
+      file.remove(false);
+    }
+    catch (e) {
+      do_throw(e);
+    }
+
+    do_check_false(file.exists());
+
+    do_test_finished();
+  }
+}
+
+function run_test() {
+  // start server
+  server = new HttpServer();
+  server.start(-1);
+
+  // Initialize downloader
+  var channel = Cc["@mozilla.org/network/io-service;1"]
+                  .getService(Ci.nsIIOService)
+                  .newChannel("http://localhost:" +
+                              server.identity.primaryPort + "/", null, null);
+
+  var targetFile = Cc["@mozilla.org/file/directory_service;1"]
+                     .getService(Ci.nsIProperties)
+                     .get("TmpD", Ci.nsIFile);
+  targetFile.append("bug" + BUGID + ".test");
+  if (targetFile.exists())
+    targetFile.remove(false);
+
+  var downloader = Cc["@mozilla.org/network/downloader;1"]
+                     .createInstance(Ci.nsIDownloader);
+  downloader.init(listener, targetFile);
+
+  // Start download
+  channel.asyncOpen(downloader, null);
+
+  do_test_pending();
+}