public function testInvokeFlow()
{
$file = $this->makeFile('encoding.invoke.utf8', mb_convert_encoding('some#¢±±§', 'UTF-8'));
$file->setEncoding('UTF-8');
$flow = Flow::convertEncoding('UTF-16');
$output = call_user_func($flow, $file);
static::assertNotSame($file, $output);
static::assertInstanceOf(LocalFile::class, $output);
static::assertEquals('UTF-16', $output->getEncoding());
}
