function test_addCheckout()
{
//Arrange
$book_id = 4;
$test_copy = new Copy($book_id);
$test_copy->save();
$name = "Phyllis the kind Grandma";
$test_patron = new Patron($name);
$test_patron->save();
//Act
$test_copy->addCheckout($test_patron);
$result = $test_copy->getCheckout();
//Assert
$this->assertEquals($test_copy->getId(), $result->getCopyId());
}