diff -r 000000000000 -r 6474c204b198 netwerk/test/unit/test_bug388281.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/netwerk/test/unit/test_bug388281.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+function run_test() {
+  const ios = Cc["@mozilla.org/network/io-service;1"].
+    getService(Ci.nsIIOService);
+
+  var uri = ios.newURI("http://foo.com/file.txt", null, null);
+  uri.port = 90;
+  do_check_eq(uri.hostPort, "foo.com:90");
+
+  uri = ios.newURI("http://foo.com:10/file.txt", null, null);
+  uri.port = 500;
+  do_check_eq(uri.hostPort, "foo.com:500");
+  
+  uri = ios.newURI("http://foo.com:5000/file.txt", null, null);
+  uri.port = 20;
+  do_check_eq(uri.hostPort, "foo.com:20");
+
+  uri = ios.newURI("http://foo.com:5000/file.txt", null, null);
+  uri.port = -1;
+  do_check_eq(uri.hostPort, "foo.com");
+
+  uri = ios.newURI("http://foo.com:5000/file.txt", null, null);
+  uri.port = 80;
+  do_check_eq(uri.hostPort, "foo.com");
+}