public function testRewind()
 {
     $iterator = new WordsIterator(new Words('text text'));
     $iterator->next();
     $iterator->next();
     $iterator->next();
     $iterator->next();
     $iterator->next();
     $iterator->next();
     $this->assertTrue($iterator->valid());
     $iterator->rewind();
     $this->assertEquals(0, $iterator->current());
 }