diff -r 000000000000 -r 6474c204b198 services/common/tests/unit/test_utils_stackTrace.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/services/common/tests/unit/test_utils_stackTrace.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,33 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+_("Define some functions in well defined line positions for the test");
+function foo(v) bar(v + 1); // line 2
+function bar(v) baz(v + 1); // line 3
+function baz(v) { throw new Error(v + 1); } // line 4
+
+_("Make sure lazy constructor calling/assignment works");
+Cu.import("resource://services-common/utils.js");
+
+function run_test() {
+  _("Make sure functions, arguments, files are pretty printed in the trace");
+  let trace = "";
+  try {
+    foo(0);
+  }
+  catch(ex) {
+    trace = CommonUtils.stackTrace(ex);
+  }
+  _("Got trace:", trace);
+  do_check_neq(trace, "");
+
+  let bazPos = trace.indexOf("baz@test_utils_stackTrace.js:7");
+  let barPos = trace.indexOf("bar@test_utils_stackTrace.js:6");
+  let fooPos = trace.indexOf("foo@test_utils_stackTrace.js:5");
+  _("String positions:", bazPos, barPos, fooPos);
+
+  _("Make sure the desired messages show up");
+  do_check_true(bazPos >= 0);
+  do_check_true(barPos > bazPos);
+  do_check_true(fooPos > barPos);
+}