docs: function (spec) {
      spec.addMatchers({
        /**
         * Array contains all elements of another array
         * @param needles another array
         * @returns {Boolean} true/false
         */
        toContainAll: function(needles) {
          var haystack = this.actual;
          return needles.every(function (elem) {
            return haystack.some(function (sackElem) {
              return spec.env.equals_(elem, sackElem);
            });
          });
        }
      });
    }