diff -r 000000000000 -r 6474c204b198 netwerk/test/unit/test_aboutblank.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/netwerk/test/unit/test_aboutblank.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,29 @@
+function run_test() {
+  var ioServ = Components.classes["@mozilla.org/network/io-service;1"]
+                         .getService(Components.interfaces.nsIIOService);
+
+  var base = ioServ.newURI("http://www.example.com", null, null);
+
+  var about1 = ioServ.newURI("about:blank", null, null);
+  var about2 = ioServ.newURI("about:blank", null, base);
+
+  var chan1 = ioServ.newChannelFromURI(about1)
+                    .QueryInterface(Components.interfaces.nsIPropertyBag2);
+  var chan2 = ioServ.newChannelFromURI(about2)
+                    .QueryInterface(Components.interfaces.nsIPropertyBag2);
+
+  var haveProp = false;
+  var propVal = null;
+  try {
+    propVal = chan1.getPropertyAsInterface("baseURI",
+                                           Components.interfaces.nsIURI);
+    haveProp = true;
+  } catch (e if e.result == Components.results.NS_ERROR_NOT_AVAILABLE) {
+    // Property shouldn't be there.
+  }
+  do_check_eq(propVal, null);
+  do_check_eq(haveProp, false);
+  do_check_eq(chan2.getPropertyAsInterface("baseURI",
+                                           Components.interfaces.nsIURI),
+              base);
+}