describe('SetOf Type', function() {
    it('should support the setOf propTypes', function() {
      typeCheckPass(PropTypes.setOf(React.PropTypes.number), Immutable.Set([1, 2, 3]));
      typeCheckPass(PropTypes.setOf(React.PropTypes.string), Immutable.Set(['a', 'b', 'c']));
      typeCheckPass(PropTypes.setOf(React.PropTypes.oneOf(['a', 'b'])), Immutable.Set(['a', 'b']));