public function testIfDownloadOfOutputFileWorks()
{
$process = $this->api->createProcess(['inputformat' => 'png', 'outputformat' => 'pdf']);
$process->start(['input' => 'upload', 'outputformat' => 'pdf', 'wait' => true, 'file' => fopen(__DIR__ . '/input.png', 'r')])->download(__DIR__ . '/output.pdf');
$this->assertFileExists(__DIR__ . '/output.pdf');
// cleanup
$process->delete();
@unlink(__DIR__ . '/output.pdf');
}