The Tor Browser / file revision

 // ParallelArray methods throw when passed a this-value that isn't a ParallelArray.

 load(libdir + "asserts.js");

 function testcase(obj, fn) {

     assertEq(typeof fn, "function");

     var args = Array.slice(arguments, 2);

     assertThrowsInstanceOf(function () { fn.apply(obj, args); }, TypeError);

 }

 function test(obj) {

     function f() {}

     testcase(obj, ParallelArray.prototype.map, f);

     testcase(obj, ParallelArray.prototype.reduce, f);

     testcase(obj, ParallelArray.prototype.scan, f);

     testcase(obj, ParallelArray.prototype.scatter, [0]);

     testcase(obj, ParallelArray.prototype.filter, [0]);

     testcase(obj, ParallelArray.prototype.flatten);

     testcase(obj, ParallelArray.prototype.partition, 2);

     testcase(obj, ParallelArray.prototype.get, [1]);

 }

 // FIXME(bug 844887) check type of this

 // if (getBuildConfiguration().parallelJS) {

 // test(ParallelArray.prototype);

 // test(Object.create(new ParallelArray));

 // test({});

 // test(null);

 // test(undefined);

 // }