at() public method

public at ( $index )
 /**
  * Fetches the item at the specified index
  *
  * @param integer $index The index of an item to fetch
  * @throws InvalidArgumentException
  * @throws OutOfRangeException
  * @return {{foo}} The item at the specified index
  */
 public function at($index)
 {
     return parent::at($index);
 }
 public function test_index_returns_value()
 {
     $col = new Collection('TestClassA', [new TestClassA(1)]);
     $res = $col->at(0);
     $this->assertEquals(new TestClassA(1), $res);
 }