Ensuring a clean slate for test runs

We are going to make our lives a lot easier if we write some helper code for our tests which ensures that at the start of each test run, the database is empty. Let's put this into spec/resetDatabase.js:

'use strict';
var async = require('async');

var resetDatabase = function (dbSession, callback) {

  async.series(
    [

      function (callback) {
        dbSession.remove('keyword', '1', function (err) {
          callback(err)
        });
      },

      function (callback) {
        dbSession.remove('category', '1', function (err) {
          callback(err)
        });
      }

    ],

    function (err, results) {
      callback(err);
    }
  );

};

module.exports = resetDatabase;

As you can see, we make use of a dbSession object. We need to create a module where this is set up, in file src/backend/dbSession...