(function(env) {
  function hasFunctioningMaps() {
    if (typeof Map === 'undefined') { return false; }

    try {
      var s = new Map();
      s.set('a',1);
      s.set('b',2);

      if (s.size !== 2) { return false; }
      if (s.has('a') !== true) { return false; }

      var iterations = 0;
      var ifForEachWorking = true;
      s.forEach(function(value, key, map) {
        ifForEachWorking = ifForEachWorking && map === s;
        if (key==='a') {
          ifForEachWorking = ifForEachWorking && value===1;
        }
        iterations++;
      });
      if (iterations !== 2) { return false; }
      if (ifForEachWorking !== true) { return false; }

      return true;
    } catch(e) {
      return false;
    }
  }

  env.requireFunctioningMaps = function() {
    if (!hasFunctioningMaps()) {
      env.pending("Browser has incomplete or missing support for Maps");
    }
  };

})(jasmine.getEnv());