diff -r 000000000000 -r 6474c204b198 netwerk/test/unit/test_standardurl_port.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/netwerk/test/unit/test_standardurl_port.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,56 @@
+var Cc = Components.classes;
+var Ci = Components.interfaces;
+
+function run_test() {
+  function makeURI(aURLSpec, aCharset) {
+    var ios = Cc["@mozilla.org/network/io-service;1"].
+              getService(Ci.nsIIOService);
+    return ios.newURI(aURLSpec, aCharset, null);
+  }
+
+  var httpURI = makeURI("http://foo.com");
+  do_check_eq(-1, httpURI.port);
+
+  // Setting to default shouldn't cause a change
+  httpURI.port = 80;
+  do_check_eq(-1, httpURI.port);
+  
+  // Setting to default after setting to non-default shouldn't cause a change (bug 403480)
+  httpURI.port = 123;
+  do_check_eq(123, httpURI.port);
+  httpURI.port = 80;
+  do_check_eq(-1, httpURI.port);
+  do_check_false(/80/.test(httpURI.spec));
+
+  // URL parsers shouldn't set ports to default value (bug 407538)
+  httpURI.spec = "http://foo.com:81";
+  do_check_eq(81, httpURI.port);
+  httpURI.spec = "http://foo.com:80";
+  do_check_eq(-1, httpURI.port);
+  do_check_false(/80/.test(httpURI.spec));
+
+  httpURI = makeURI("http://foo.com");
+  do_check_eq(-1, httpURI.port);
+  do_check_false(/80/.test(httpURI.spec));
+
+  httpURI = makeURI("http://foo.com:80");
+  do_check_eq(-1, httpURI.port);
+  do_check_false(/80/.test(httpURI.spec));
+
+  httpURI = makeURI("http://foo.com:80");
+  do_check_eq(-1, httpURI.port);
+  do_check_false(/80/.test(httpURI.spec));
+
+  httpURI = makeURI("https://foo.com");
+  do_check_eq(-1, httpURI.port);
+  do_check_false(/443/.test(httpURI.spec));
+
+  httpURI = makeURI("https://foo.com:443");
+  do_check_eq(-1, httpURI.port);
+  do_check_false(/443/.test(httpURI.spec));
+
+  // XXX URL parsers shouldn't set ports to default value, even when changing scheme?
+  // not really possible given current nsIURI impls
+  //httpURI.spec = "https://foo.com:443";
+  //do_check_eq(-1, httpURI.port);
+}