Spies

You can relax the matching condition by using matcher.Matcher objects:

var _M = spies.Matchers;

_.spy(person.iceCream, 'scoop');

person.eatIceCream(1);
person.eatIceCream('gallon');

expect(_.callCountOf(person.iceCream.scoop)(Matchers.isA('number'))).to.be.equal(1);

_.reset();

You can also get the matched arguments by getting the matchingArgs on the matcher object. This is very useful for getting event handlers:

// Source Code
var object = {
  fn: function() {};
};

var handler = function() {
  object.fn();
};

var f = function() {
  document.addEventHandler('click', handler);
};


// Test Code
var _ = spies.Spies;
var _M = spies.Matcher;

var isAFunction = _M.isA(Function);
_.spy(object, 'fn');
_.spy(document, 'addEventHandler');

f();

expect(_.callCountOf(document.addEventHandler)('click', isAFunction)).to.be.equal(1);

// Now call the handler.
isAFunction.matchingArgs[0]();
expect(_.callCountOf(object.fn)()).to.be.equal(1);

For more list of Matchers, go to the API section page.