diff -r 000000000000 -r 6474c204b198 modules/libjar/zipwriter/test/unit/test_bug433248.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/modules/libjar/zipwriter/test/unit/test_bug433248.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,73 @@
+/* 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/.
+ */
+
+function run_test()
+{
+  var test;
+  // zipW is an uninitialised zipwriter at this point.
+  try {
+    test = zipW.file;
+    do_throw("Should have thrown uninitialized error.");
+  }
+  catch (e) {
+    do_check_eq(e.result, Components.results.NS_ERROR_NOT_INITIALIZED);
+  }
+
+  try {
+    test = zipW.comment;
+    do_throw("Should have thrown uninitialized error.");
+  }
+  catch (e) {
+    do_check_eq(e.result, Components.results.NS_ERROR_NOT_INITIALIZED);
+  }
+
+  try {
+    zipW.comment = "test";
+    do_throw("Should have thrown uninitialized error.");
+  }
+  catch (e) {
+    do_check_eq(e.result, Components.results.NS_ERROR_NOT_INITIALIZED);
+  }
+
+  try {
+    zipW.addEntryDirectory("test", 0, false);
+    do_throw("Should have thrown uninitialized error.");
+  }
+  catch (e) {
+    do_check_eq(e.result, Components.results.NS_ERROR_NOT_INITIALIZED);
+  }
+
+  try {
+    zipW.addEntryFile("test", Ci.nsIZipWriter.COMPRESSION_DEFAULT, tmpDir, false);
+    do_throw("Should have thrown uninitialized error.");
+  }
+  catch (e) {
+    do_check_eq(e.result, Components.results.NS_ERROR_NOT_INITIALIZED);
+  }
+
+  try {
+    zipW.removeEntry("test", false);
+    do_throw("Should have thrown uninitialized error.");
+  }
+  catch (e) {
+    do_check_eq(e.result, Components.results.NS_ERROR_NOT_INITIALIZED);
+  }
+
+  try {
+    zipW.processQueue(null, null);
+    do_throw("Should have thrown uninitialized error.");
+  }
+  catch (e) {
+    do_check_eq(e.result, Components.results.NS_ERROR_NOT_INITIALIZED);
+  }
+
+  try {
+    zipW.close();
+    do_throw("Should have thrown uninitialized error.");
+  }
+  catch (e) {
+    do_check_eq(e.result, Components.results.NS_ERROR_NOT_INITIALIZED);
+  }
+}