diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Debugger-debuggees-01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Debugger-debuggees-01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,5 @@
+// A Debugger object created with no argument initially has no debuggees.
+var dbg = new Debugger;
+var debuggees = dbg.getDebuggees();
+assertEq(Array.isArray(debuggees), true);
+assertEq(debuggees.length, 0);