Sokil\Mongo\DocumentRelationTest::testGetRelated_Belongs_EmptyRelation PHP Метод

    public function testGetRelated_Belongs_EmptyRelation()
    {
        // collections
        $enginesCollection = $this->database->getCollection('engines');
        // add target document
        $engineDocument = $enginesCollection->createDocument(array('param' => 'value'))->save();
        // test
        $this->assertEquals(null, $engineDocument->car);
    }