Sokil\Mongo\DocumentTest::testSet_SubkeyOfNewKey_StoredDocument PHP Method

    public function testSet_SubkeyOfNewKey_StoredDocument()
    {
        $document = $this->collection->createDocument(array('param' => 1))->save();
        // update existed document
        $document->set('a.b', 'value2')->save();
        // get document from db
        $document = $this->collection->getDocumentDirectly($document->getId());
        $this->assertEquals('value2', $document->get('a.b'));
    }