function test_setBookId()
{
//Arrange
$available = true;
$book_id = 1;
$test_copy = new Copy($available, $book_id);
$book_id2 = 2;
//Act
$test_copy->setBookId($book_id2);
$result = $test_copy->getBookId();
//Assert
$this->assertEquals($book_id2, $result);
}
