diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/onExceptionUnwind-01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/onExceptionUnwind-01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+// Basic onExceptionUnwind hook test.
+
+load(libdir + "asserts.js");
+
+var g = newGlobal();
+var dbg = Debugger(g);
+var hit = false;
+dbg.onExceptionUnwind = function (frame, exc) {
+    // onExceptionUnwind is called multiple times as the stack is unwound.
+    // Only check the first hit.
+    assertEq(arguments.length, 2);
+    assertEq(frame instanceof Debugger.Frame, true);
+    if (!hit) {
+        assertEq(exc, 101);
+        assertEq(frame.type, "call");
+        assertEq(frame.callee.name, "f");
+        assertEq(frame.older.type, "eval");
+        hit = true;
+    }
+};
+
+g.eval("function f() { throw 101; }");
+assertThrowsValue(function () { g.eval("f();"); }, 101);
+assertEq(hit, true);