diff -r 000000000000 -r 6474c204b198 netwerk/test/unit/test_dns_service.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/netwerk/test/unit/test_dns_service.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,26 @@
+var dns = Cc["@mozilla.org/network/dns-service;1"].getService(Ci.nsIDNSService);
+
+var listener = {
+  onLookupComplete: function(inRequest, inRecord, inStatus) {
+    var answer = inRecord.getNextAddrAsString();
+    do_check_true(answer == "127.0.0.1" || answer == "::1");
+
+    do_test_finished();
+  },
+  QueryInterface: function(aIID) {
+    if (aIID.equals(Ci.nsIDNSListener) ||
+        aIID.equals(Ci.nsISupports)) {
+      return this;
+    }
+    throw Cr.NS_ERROR_NO_INTERFACE;
+  }
+};
+
+function run_test() {
+  var threadManager = Cc["@mozilla.org/thread-manager;1"].getService(Ci.nsIThreadManager);
+  var mainThread = threadManager.currentThread;
+  dns.asyncResolve("localhost", 0, listener, mainThread);
+
+  do_test_pending();
+}
+