diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Frame-onStep-resumption-01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Frame-onStep-resumption-01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+// If frame.onStep returns {return:val}, the frame returns.
+
+var g = newGlobal();
+g.eval("function f(x) {\n" +
+       "    var a = x * x;\n" +
+       "    return a;\n" +
+       "}\n");
+
+var dbg = Debugger(g);
+dbg.onEnterFrame = function (frame) {
+    frame.onStep = function () { return {return: "pass"}; };
+};
+
+assertEq(g.f(4), "pass");