database_exists() public method

Check if a db exists
public database_exists ( string $db ) : boolean
$db string the db name
return boolean
 /**
  * test dropping 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));
 }