public function testRemoveOne()
{
$id = '54203e08d51d4a1f868b456e';
$collection = $this->getCollection();
$document = ['_id' => new \MongoId($id), 'foo' => 'bar'];
$collection->insert($document);
$collection->remove(['_id' => new \MongoId($id)]);
$newCollection = $this->getCheckDatabase()->selectCollection('test');
$this->assertSame(0, $newCollection->count());
}