public function testGeneral()
 {
     $manager = new DbManager();
     $manager->getConfig();
     $origin = $manager->getDefaultDriverName();
     $manager->setDefaultDriverName('another_driver');
     $this->assertEquals($manager->getDefaultDriverName(), 'another_driver');
     $manager->setDefaultDriverName($origin);
     $this->assertNotEmpty($manager->getConfig());
     $manager->getMaster();
     $manager->getSlave();
     $origin = $manager->getPrefix();
     $manager->setPrefix('another_prefix');
     $this->assertEquals($manager->getPrefix(), 'another_prefix');
     $manager->setPrefix($origin);
 }