Sokil\Mongo\DocumentTest::testSet_NewKey_StoredDocument PHP Method

    public function testSet_NewKey_StoredDocument()
    {
        $document = $this->collection->createDocument(array('param' => 'value'))->save();
        // update existed document
        $document->set('a', 'value')->save();
        // get document from db
        $document = $this->collection->getDocumentDirectly($document->getId());
        $this->assertEquals('value', $document->get('a'));
    }