/**
  * @dataProvider validItems
  */
 public function testIfListDoesNotContainItem($itemType, array $validItems, array $otherValidItems)
 {
     $list = new GenericList($itemType);
     foreach ($validItems as $item) {
         $list->add($item);
     }
     $this->assertFalse($list->contains($otherValidItems[0]));
 }