Async testing

gistfile1.js

// testharness.js
var t = async_test("Timeout times out");
setTimeout(t.step_func(function () {
    assert_true(true);
    t.done();
}), 100);

// Jasmine
describe("Timeout", function () {
    it("times out", function () {
        var result = false;
        setTimeout(function () { result = true; }, 100);
        waitsFor(function () { return result; });
        runs(function () {
            expect(result).toBeTruthy();
        });
    });
})

// QUnit
asyncTest("Timeout times out", function () {
    setTimeout(function () {
        ok(true, "true is true");
        start();
    }, 100);
});

// Mocha
describe("Timeout", function () {
    it("times out", function (done) {
        setTimeout(function () {
            true.should.equal(true);
            done();
        }, 100);
    });
});