function testDelete()
{
$book_id = 1;
$test_copy = new Copy($book_id);
$test_copy->save();
$book_id2 = 2;
$test_copy2 = new Copy($book_id2);
$test_copy2->save();
$test_copy->delete();
$this->assertEquals([$test_copy2], Copy::getAll());
}
function test_delete()
{
//Arrange
$book_id = 2;
$test_copy = new Copy($book_id);
$test_copy->save();
//Act
$test_copy->delete();
$result = Copy::getAll();
//Assert
$this->assertEquals([], $result);
}
function test_delete()
{
//Arrange
$available = true;
$book_id = 4;
$test_copy = new Copy($available, $book_id);
$test_copy->save();
$available2 = true;
$book_id2 = 5;
$test_copy2 = new Copy($available2, $book_id2);
$test_copy2->save();
//Act
$test_copy->delete();
$result = Copy::getAll();
//Assert
$this->assertEquals([$test_copy2], $result);
}