JavaScript unit testing in the console

test.js

function test (name, fn) {
  console.group(name);
  var args = [ console.assert.bind(console) ];
  // Async
  if (fn.length > 1) {
    var timeout = setTimeout(function(){ console.error(name+' timed out'); }, 2000);
    args.push(clearTimeout.bind(null, timeout));
  }
  fn.apply(null, args);
  console.groupEnd();
}

usage.js

test("My test", function (assert) {
  assert(true, "Everything ok?");
});

test("Asynchronous test", function (assert, done) {
  setTimeout(function () {
    assert(true, "Everything ok?");
    done();
  }, 100);
});