michael@0: // Source.prototype.url can be a string or null.
michael@0: 
michael@0: var g = newGlobal();
michael@0: var dbg = new Debugger;
michael@0: var gw = dbg.addDebuggee(g);
michael@0: for (var fileName of ['file:///var/foo.js', null]) {
michael@0:     g.evaluate("function f(x) { return 2*x; }", {fileName: fileName});
michael@0:     var fw = gw.getOwnPropertyDescriptor('f').value;
michael@0:     assertEq(fw.script.source.url, fileName);
michael@0: }