public function testFindOneWithFilenameReturnsFile()
{
$collection = $this->getGridFS();
$this->prepareFile('abcd', ['filename' => 'abcd']);
$this->prepareFile('test', ['filename' => 'test']);
$this->prepareFile('zyxv', ['filename' => 'zyxv']);
$result = $collection->findOne('test');
$this->assertInstanceOf('MongoGridFSFile', $result);
$this->assertSame('test', $result->getBytes());
}