text: 'use strict';
  
  module.exports = function (t, a) {
      a(t({}), 0, "Empty");
      a(t({raz: 1, dwa: null, trzy: undefined, cztery: 0}), 4,
          "Some properties");
      a(t(Object.defineProperties({}, {
          raz: {value: 'raz'},
          dwa: {value: 'dwa', enumerable: true}
      })), 1, "Some properties hidden");
  };
  