function test_update()
{
//arrange
$stylist_name = "Nora";
$id = null;
$test_stylist = new Stylist($stylist_name, $id);
$test_stylist->save();
$new_stylist_name = "Dora";
//act
$test_stylist->updateStylistName($new_stylist_name);
//assert
$this->assertEquals("Dora", $test_stylist->getStylistName());
}