public function testGetResource()
{
$data = str_repeat('a', 500 * 1024);
$id = $this->prepareFile($data);
$file = $this->getGridFS()->findOne(['_id' => $id]);
$this->assertInstanceOf(\MongoGridFSFile::class, $file);
$result = $file->getResource();
$this->assertTrue(is_resource($result));
$this->assertSame($data, stream_get_contents($result));
}