private function assert_validity($value, $boolean, $msg = null) { $book = new BookNumericality(); $book->numeric_test = $value; if ($boolean == 'valid') { $this->assert_true($book->save()); $this->assert_false($book->errors->is_invalid('numeric_test')); } else { $this->assert_false($book->save()); $this->assert_true($book->errors->is_invalid('numeric_test')); if (!is_null($msg)) { $this->assert_same($msg, $book->errors->on('numeric_test')); } } }