diff -r 000000000000 -r 6474c204b198 modules/libjar/test/unit/test_not_found.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/modules/libjar/test/unit/test_not_found.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+// Should report file not found on non-existent files
+
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+const path = "data/test_bug333423.zip";
+
+function run_test() {
+  var ios = Cc["@mozilla.org/network/io-service;1"].
+            getService(Ci.nsIIOService);
+  var spec = "jar:" + ios.newFileURI(do_get_file(path)).spec + "!/";
+  var channel = ios.newChannel(spec + "file_that_isnt_in.archive", null, null);
+  try {
+    instr = channel.open();
+    do_throw("Failed to report that file doesn't exist")
+  } catch (e) {
+      do_check_true(e.name == "NS_ERROR_FILE_NOT_FOUND")
+  }
+}