diff -r 000000000000 -r 6474c204b198 dom/permission/tests/unit/test_bug808734.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/permission/tests/unit/test_bug808734.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,62 @@
+const Cu = Components.utils;
+const READWRITE = "readwrite";
+const UNKNOWN = "foobar";
+
+var gData = [
+// test normal expansion
+{
+  permission: "contacts",
+  access: READWRITE,
+  expected: ["contacts-read", "contacts-create",
+             "contacts-write"]
+},
+// test additional expansion and access not having read+create+write
+{
+  permission: "settings",
+  access: READWRITE,
+  expected: ["settings-read", "settings-write",
+             "indexedDB-chrome-settings-read",
+             "indexedDB-chrome-settings-write"]
+},
+// test substitute
+{
+  permission: "storage",
+  expected: ["indexedDB-unlimited",
+             "default-persistent-storage"]
+},
+// test unknown access
+{
+  permission: "contacts",
+  access: UNKNOWN,
+  expected: []
+},
+// test unknown permission
+{
+  permission: UNKNOWN,
+  access: READWRITE,
+  expected: []
+}
+];
+
+// check if 2 arrays contain the same elements
+function do_check_set_eq(a1, a2) {
+  do_check_eq(a1.length, a2.length)
+
+  Array.sort(a1);
+  Array.sort(a2);
+
+  for (let i = 0; i < a1.length; ++i) {
+    do_check_eq(a1[i], a2[i])
+  }
+}
+
+function run_test() {
+  var scope = {};
+  Cu.import("resource://gre/modules/PermissionsTable.jsm", scope);
+
+  for (var i = 0; i < gData.length; i++) {
+    var perms = scope.expandPermissions(gData[i].permission,
+                                        gData[i].access);
+    do_check_set_eq(perms, gData[i].expected);
+  }
+}