/**
  * test drop database
  */
 public function test_database_droppage()
 {
     $db = "test_db";
     //create it
     $this->assertEquals(true, $this->adapter->create_database($db));
     $this->assertEquals(true, $this->adapter->database_exists($db));
     //drop it
     $this->assertEquals(true, $this->adapter->drop_database($db));
     $this->assertEquals(false, $this->adapter->database_exists($db));
 }