public function test_to_json_methods_not_array()
 {
     $book = Book::find(1);
     $json = $book->to_json(array('methods' => 'upper_name'));
     $decoded = (array) json_decode($json);
     $this->assert_true(array_key_exists('upper_name', array_flip(array_keys($decoded))));
     $this->assert_true(ActiveRecord\Inflector::is_upper($decoded['upper_name']));
 }