config calls to run tests.

gistfile1.js

//in test1.js
define({
  paths: {},
  deps: ['test/_', 'test/$', 'dep1', 'dep2'],
  callback: function (_, $, dep1, dep2) {
    //test dep1 and dep2 in here 
  }
});

//in test2.js
define({
  paths: {},
  deps: ['test/_', 'test/$', 'dep3', 'dep4'],
  callback: function (_, $, dep3, dep4) {
    //test dep3 and dep4 in here
  }
});

//testLoader. Depends on any modules you want to use
//separate to the ones used in the tests.
define(['jquery', 'underscore'], function ($, _) {
  var contextCount = 0,
      globalRequire = require;
  return {
    load: function(id, require, load, config) {
      require([id], function (config) {
        config.context = 'test' + (countextCounter += 1);
        var oldCallback = config.callback;
        config.callback = function () {
          oldConfig.apply(config, [].slice.call(arguments, 0));
          //Signal loading is complete
          load();
        }
        
        //Set up versions of libs you only want to use in
        //the tests, and not in the app modules. Put them
        //under a 'test' namespace (or something else to your liking)
        //By doing this right before the globalRequire call, it means
        //they will be claimed by the globalRequire
        define('test/$', function () { return $; });
        define('test/_', function () { return _; });
        globalRequire(config);
      });
    }
  };
});

//Using it:
require.config({
  context: 'testLoaderRequire',
  //configure the test versions of 'jquery' and 'underscore'
  //that will be used by the testLoader plugin here.
  paths: {},
  shim: {},

  //load the tests
  deps: ['testLoader!test1', 'testLoader!test2'],
  callback: function () {
    mocha.run();
  }
});