Util.Options.test.js

    "recursive definition" : function (assert) {
      var o = new Options({
        type : {
          type : { enumerable : ["string", "number", "object", "function", "boolean"] },
          required : {
            required : false,
            type : "boolean"
          }
        }
      });
      o.parse({
        type : "string"
      });
      o.parse({
        type : "number"
      });
      o.parse({
        required : false,
        type : "number"
      });
    },