root mocha setup for mongodb int tests

setup.js

'use strict';

var mongoose = require('mongoose');
var _ = require('lodash');

var conn;

function clearDB() {

    var cleaned = [];

    _.each(conn.collections, (function (col) {
        cleaned.push(col.remove());
    }));

    return Promise.all(cleaned);
}

beforeEach(function () {
    if (!conn) {
        conn = mongoose.createConnection('mongodb://localhost:21017/f2test');
    } else if (conn.readyState === 0) {
        conn.on('open', function (err) {
            if (err) {
                throw err;
            }
            return clearDB();
        });
    } else {
        return clearDB();
    }
});

afterEach(function (done) {
    conn.close();
    return done();
});