diff -r 000000000000 -r 6474c204b198 modules/libjar/test/unit/test_bug597702.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/modules/libjar/test/unit/test_bug597702.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,33 @@
+/* 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/. */
+
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+
+// Check that reading non existant inner jars results in the right error
+
+function run_test() {
+  var file = do_get_file("data/test_bug597702.zip");
+  var ios = Cc["@mozilla.org/network/io-service;1"].
+            getService(Ci.nsIIOService);
+  var outerJarBase = "jar:" + ios.newFileURI(file).spec + "!/";
+  var goodSpec = "jar:" + outerJarBase + "inner.jar!/hello";
+  var badSpec = "jar:" + outerJarBase + "jar_that_isnt_in_the.jar!/hello";
+  var goodChannel = ios.newChannel(goodSpec, null, null);
+  var badChannel = ios.newChannel(badSpec, null, null);
+
+  try {
+    instr = goodChannel.open();
+  } catch (e) {
+    do_throw("Failed to open file in inner jar");
+  }
+
+  try {
+    instr = badChannel.open();
+    do_throw("Failed to report that file doesn't exist");
+  } catch (e) {
+    do_check_true(e.name == "NS_ERROR_FILE_NOT_FOUND");
+  }
+}
+