--TEST-- Psr\Http\Client\ClientInterface --SKIPIF-- --FILE-- sendRequest($request); var_dump($response instanceof \Psr\Http\Message\ResponseInterface); --EXPECTF-- bool(true) array(1) { ["PsrExt\Http\Client\ClientInterface"]=> string(34) "PsrExt\Http\Client\ClientInterface" } string(25) "SampleClient::sendRequest" object(SampleRequest)#%d (0) { } bool(true)