it('should fill the return value with its properties', function () {
var model = new Model({ x: 1 });
var value = model.valueOf();
expect(value.x).toBe(1);
});
it('should not return its stored context directly', function () {
var model = new Model({ x: 1 });
var value = model.valueOf();
model.set('y', 1);
expect(value.y).toBeUndefined();
});
it('should return a plain object', function () {
var model = new Model({ x: 1 });
var value = model.valueOf();
expect(value).toBeOfType('object');
});