I am trying to run some tests using mocha but cant seem to get over this error.

E:tddnodejscart>mocha cart.test.js



node.js:201

        throw e; // process.nextTick error, or 'err

              ^

ReferenceError: suite is not defined

    at Object.<anonymous> (E:tddnodejscartcart.test.js:5:1

    at Module._compile (module.js:432:26)

    at Object..js (module.js:450:10)

    at Module.load (module.js:351:31)

    at Function._load (module.js:310:12)

    at Module.require (module.js:357:17)

    at require (module.js:368:17)

    at C:UserslexAppDataRoamingnpmnode_module

    at Array.forEach (native)

    at load (C:UserslexAppDataRoamingnpmnode_

9)

    at Object.<anonymous> (C:UserslexAppDataRoa

in_mocha:237:1)

    at Module._compile (module.js:432:26)

    at Object..js (module.js:450:10)

    at Module.load (module.js:351:31)

    at Function._load (module.js:310:12)

    at Array.0 (module.js:470:10)

    at EventEmitter._tickCallback (node.js:192:40)

From what I can tell from the call stack the problem is here cart.test.js:5:1.
Any idea what is causing this ?

Thanks

cart.js

var GetTotalSum = function (input) {

    var total = 0,

        differentTitles = 0,

        discountMap = [0, 1, 0.95, 0.9, 0.8, 0.75],

        BOOK_PRICE = 8;



    for (var i in input) {

        total += input[i] * BOOK_PRICE;

        if (input[i] > 0) {

            differentTitles++;

        }

    }



    if (differentTitles > 1) {

        total = total * discountMap[differentTitles];

    }



    return total;

}





module.exports.GetTotalSum = GetTotalSum;

cart.test.js

var assert = require('assert'),

    cart = require('./cart.js');





suite('cart', function () {

    test('buy one book', function () {

        // Arrange

        var input = [1, 0, 0, 0, 0],

            expected = 8;



        // Act

        var actual = cart.GetTotalSum(input);



        // Assert

        assert.equal(actual, expected);     

    });

});