public function testInvoke()
{
$this->assertEquals([], $this->writer->write([]));
$this->assertEquals([true], $this->writer->write([$this->vfs->path('/tmp/tempfile') => 'file.txt'], 'field', []));
$this->assertEquals([false], $this->writer->write([$this->vfs->path('/tmp/invalid.txt') => 'file.txt'], 'field', []));
}