public function testDBConnection()
{
$this->assertTrue(is_object(self::$connection));
$this->assertTrue(self::$connection instanceof PDO);
$connection = DatabaseConnection::close();
$this->assertNull($connection);
}
/**
* Create a PDO connection if one does not exist.
*
* @return void
*/
public static function connect()
{
if (is_null(self::$connection)) {
self::$connection = DatabaseConnection::connect();
}
}