Sokil\Mongo\CursorTest::testReadPrimaryOnly PHP Method

    public function testReadPrimaryOnly()
    {
        $qb = $this->collection->find()->readPrimaryOnly();
        $this->assertEquals(array('type' => \MongoClient::RP_PRIMARY, 'tagsets' => array()), $qb->getReadPreference());
        $qb->current();
        $this->assertEquals(array('type' => \MongoClient::RP_PRIMARY), $qb->getReadPreference());
    }