Upload file with WP_REST_Request /wp/v2/media

I’m trying to upload a file within own plugin using WP_REST_Request and /wp/v2/media (POST).I’ve used the code from https://github.com/bobbingwide/wordpress-develop-tests/blob/master/phpunit/tests/rest-api/rest-attachments-controller.php as a reference.

Such coding works OK and the file is uploaded:

$filepath = '/tmp/00001.jpg';$filename = '00001.jpg';$request = new WP_REST_Request( 'POST', '/wp/v2/media' );$request->set_headers(  array('Content-Disposition' => "attachment; filename={$filename}",'Content-Type' => 'image/jpeg',  ));   $request->set_body( file_get_contents( $filepath ) );   $response = rest_do_request( $request );

but follow coding ends with Http-Error 500 and error message 'Specified file failed upload test.' :

$filepath = '/tmp/00001.jpg';$filename = '00001.jpg';$request = new WP_REST_Request( 'POST', '/wp/v2/media' );$request->set_file_params(  array( 'file' => array('file'     => file_get_contents( $filepath ),'name'     => $filename,'size'     => filesize( $filepath ),'tmp_name' => $filepath  ) ));$request->set_header( 'Content-MD5', md5_file( $filepath ) );$response = rest_do_request( $request );

Regarding the reference coding such call should also be ok, could you tell me what’s the problem?

Kind regards,Annie