EspoCRM API as external libraries

I’m trying to use EspoCRM APIs as external libraries, but without good results.
The PHP “use” statement is used in the API code, which Scriptcase does not recognize, returning an error at run time…

instead of

use Espo\ApiClient\Client;

$client = new Client('https://your-espocrm-site');

try

$client = new Espo\ApiClient\Client('https://your-espocrm-site');