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 // {has,add,remove}Debuggee throw a TypeError if the argument is invalid.

 load(libdir + "asserts.js");

 var dbg = new Debugger;

 function check(val) {

     assertThrowsInstanceOf(function () { dbg.hasDebuggee(val); }, TypeError);

     assertThrowsInstanceOf(function () { dbg.addDebuggee(val); }, TypeError);

     assertThrowsInstanceOf(function () { dbg.removeDebuggee(val); }, TypeError);

 }

 // Primitive values are invalid.

 check(undefined);

 check(null);

 check(false);

 check(1);

 check(NaN);

 check("ok");

 // A Debugger.Object that belongs to a different Debugger object is invalid.

 var g = newGlobal();

 var dbg2 = new Debugger;

 var w = dbg2.addDebuggee(g);

 assertEq(w instanceof Debugger.Object, true);

 check(w);