My approach to test GeddyJS(an API application) with Mocha

config.js

SomeNamespace.validModel = function(modelName, inf) {
    var model = geddy.model[modelName].create(inf);
    describe('Valid Model', function() {
        it('should be valid with all required properties', function() {
            if (!model.isValid()) {
                console.log("\t", model.errors);
            }
            expect(model.isValid()).to.be.equal(true);
        });
    });
};

Jakefile

/**
 * Namespace to run some componnents of the API
 * @ref http://jebchit.info/pr/browse.php/Oi8vamFr/ZWpzLmNv/bS9kb2Nz/b5/
 * @return {Object}
 */
namespace('tests', function() {

    var Mocha = require('mocha'),
        fs = require('fs'),
        mocha, runTests;

    mocha = new Mocha({
        reporter: 'spec',
        ui: 'bdd',
        timeout: '10000'
    });

    /**
     * Function reused to run tests from models and controllers tasks.
     * @return {Function}
     */
    runTests = function() {
        mocha.options.ignoreLeaks = true;
        mocha.run();
    };

    /**
     * Helpers to be reused on similar tests
     */
    mocha.addFile('test/config.js');

    /**
     * Do not require chai and set chai's properties to scope variables on any
     * test.
     * global.should = chai.should();
     * global.assert = chai.assert;
     */
    global.chai = require('chai');

    /**
     * TODO: research about assigning this as global is bad or acceptable
     */
    global.expect = chai.expect;

    desc('With this task, we will run all tests related to models');
    task('models', function(model) {

        fs.readdirSync('test/models').filter(function(file) {
            /**
             * Add all files from 'test/models' directory if no model was passed
             * as param
             * CLI: geddy jake tests:models
             */
            if (!model) {
                return mocha.addFile('test/models/' + file);
            }

            /**
             * Add only model passed as param
             * CLI: geddy jake tests:models[modelName]
             */
            if (file.toLowerCase().replace('.js', '') === model) {
                return mocha.addFile('test/models/' + file);
            }
        });

        return runTests();
    });

    desc('With this task, we will run all tests related to controllers');
    task('controllers', function(controller) {

        fs.readdirSync('test/controllers').filter(function(file) {

            /**
             * Add all files from test/controllers folder, if there's no
             * controller from params
             * CLI;
             *     geddy jake tests:controllers
             */
            if (!controller) {
                return mocha.addFile('test/controllers/' + file);
            }

            /**
             * Add only controller passed as params
             * CLI:
             *     geddy jake tests:controllers[controllerName]
             */
            if (file.toLowerCase().replace('.js', '') === controller) {
                return mocha.addFile('test/controllers/' + file);
            }
        });

        return runTests();
    });
});

task('test', function(done) {
    jake.Task['tests:models'].invoke();
    jake.Task['tests:controllers'].invoke();
});

package.json

"devDependencies": {
    "chai": "1.9.1",
    "mocha": "1.21.0",
    "node-inspector": "^0.7.4",
    "request": "^2.34.0"
}

Looks pretty reasonable. I'm just using Jake's built-in TestTask for testing, but I can certainly see the appeal of something like Mocha that's ubiquitous and well supported.