/**
* @test
* @group metadata
* @group contactperson
*/
public function the_index_of_a_telephone_number_can_be_retrieved()
{
$numberOne = new TelephoneNumber('123');
$numberTwo = new TelephoneNumber('456');
$notInList = new TelephoneNumber('789');
$list = new TelephoneNumberList(array($numberOne, $numberTwo));
$this->assertEquals(0, $list->indexOf($numberOne));
$this->assertEquals(1, $list->indexOf($numberTwo));
$this->assertEquals(-1, $list->indexOf($notInList), 'An element not in the list has an index of -1');
}
