code: function setup(options) {
      var childRunner = ChildRunner.current();
      if (childRunner) {
          _deepMerge(_config, childRunner.parentScope.WCT._config);
          // But do not force the mocha UI
          delete _config.mochaOptions.ui;
      }
      if (options && typeof options === 'object') {
          _deepMerge(_config, options);
      }
      if (!_config.root) {
          // Sibling dependencies.
          var root = scriptPrefix('browser.js');
          _config.root = basePath(root.substr(0, root.length - 1));
          if (!_config.root) {
              throw new Error('Unable to detect root URL for WCT sources. Please set WCT.root before including browser.js');
          }
      }
  }
docs: Merges initial `options` into WCT's global configuration.
  
  @param {Object} options The options to merge. See `browser/config.js` for a
  reference.