diff -r 000000000000 -r 6474c204b198 toolkit/devtools/server/tests/unit/tracerlocations.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/devtools/server/tests/unit/tracerlocations.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+// For JS Tracer tests dealing with source locations.
+
+function foo(x) {
+  x += 6;
+  return "bar";
+}
+
+foo(42);