/**
  * {@inheritdoc}
  */
 public function exists(Closure $p)
 {
     $this->initialize();
     return $this->coll->exists($p);
 }
 public function test_checking_if_doesnt_exists()
 {
     $coll = new Collection();
     $coll->addItem('Test Item', 1);
     $actual = $coll->exists(2);
     $this->assertFalse($actual);
 }