with_temp_zip(function(ZipStream &$zip) use ($chunk_size, $num_chunks) { $zip->add('hello.txt', function($e) use ($chunk_size, $num_chunks) { # build chunk $data = str_repeat('x', $chunk_size); # repeatedly write chunk foreach (range(0, $num_chunks - 1) as $i) { $e->write($data); } }); }, function($zip_path) use ($expected_size) { $zip = $this->open_archive($zip_path); $st = $zip->statName('hello.txt'); $this->assertEquals($expected_size, $st['size']); }); } };