async.js

test("something", function() {
  expect(1);
  stop();
  setTimeout(function() {
    start();
    ok(true);
  }, 1000);
});

// must() returns a function that MUST be called (simple impl: stop() and 
// wrap the function with a start())

test("something", function() {
  setTimeout(must(function() {
    ok(true);
  }), 1000)
  
  Ember.something(mustNot);
})

// the basic idea is that often you use expect() simply to assert that some
// function is actually called (or not called).

must = function(callback) {
  stop();
  
  return function() {
    start();
    callback.apply(this, arguments);
  }
};

mustNot = function() {
  return function() {
    ok(false, "WAT");
  }
};

// this is for cases where you basically need a function that throws...
// perhaps there could be some async version with a timeout?

mustNot = function(timeout) {
  // incorrect implementation
  stop();

  var f = function() {
    ok(false, "WAT");
  };
  
  var timer = setTimeout(f, timeout);
};