Mocha JavaScript test warning: TypeError: 'undefined' is not a function

I have a Mocha test that assigns an object from a prototyped class to a variable. When this object is initiated a couple of processes get executed.

• Possibly multiple DOM nodes are selected with a class selector.


• A jQuery each loop is supposed to go through the elements within the fetched elements and assign click handlers.

This is where the test breaks.

The error from the terminal:

Running "mocha:all" (mocha) task
Testing: test/index.html
Warning: TypeError: 'undefined' is not a function (evaluating 'function(i, element) {
            var $element = $(element);
            this.setClickHandlers($element);
        }.bind(this)')

The relevant part the JavaScript class:

Selectable = function(overrrideSettings, dependancies) {
    // Instance variables.
    this.__settings = $.extend(settings, overrrideSettings);
    this.__classId = ((( 1 + Math.random()) * 0x10000) | 0) + new Date().getTime();
    this.$__selectables = $(this.__settings.element);
    // Call the init method.
    this.init();
};

/*
 * Initialize selectables.
 */
Selectable.prototype.init = function() {
    // ** BUG **
    // The callback function seems to be giving trouble.
    this.$__selectables.each(function(i, element) {
        var $element = $(element);
        this.setClickHandlers($element);
    }.bind(this));
};

Is it possible to fix this and what is the actual problem.