/**
* Tests Arr::callback()
*
* @test
* @dataProvider providerCallback
* @param string $str String to parse
* @param array $expected Callback and its parameters
*/
public function testCallback($str, $expected)
{
$result = Arr::callback($str);
$this->assertSame(2, count($result));
$this->assertSame($expected, $result);
}