function test_updateClientName()
 {
     //arrange
     $stylist_name = "Lisa";
     $id = null;
     $test_stylist = new Stylist($stylist_name, $id);
     $test_stylist->save();
     $client_name = "Alfred";
     $stylist_id = $test_stylist->getId();
     $test_client = new Client($client_name, $id, $stylist_id);
     $new_client_name = "Steven";
     //act
     $test_client->updateClientName($new_client_name);
     //assert
     $this->assertEquals("Steven", $test_client->getClientName());
 }