/**
  * Tests the arr::pluck() function.
  * @dataProvider pluck_provider
  * @group core.helpers.arr.pluck
  * @test
  */
 public function pluck($input_key, $input_array, $expected_result)
 {
     $result = arr::pluck($input_key, $input_array);
     $this->assertEquals($expected_result, $result);
 }