assertFalse($request->execute($curl)); } public function testGet() { if (version_compare(PHP_VERSION, '7.3.0', '>=')) { $assertRegExp = 'assertMatchesRegularExpression'; } else { $assertRegExp = 'assertRegExp'; } $url = 'https://holidayapi.com'; $request = new Request(array( 'execute' => array( $url => function () { return ''; }, ), )); try { $request->get($url); } catch (\Exception $e) { $this->$assertRegExp('/empty response/i', $e->getMessage()); } } }