public function testAddColumn()
{
$driver = new MySQLDriver();
$args = new ArgumentArray();
$column = new Column('last_name', 'varchar(30)');
$column->default('');
$column->notNull();
$q = new AlterTableQuery('products');
$q->addColumn($column);
$this->assertDriverQuery(new MySQLDriver(), $q);
$this->assertSqlStrings($q, [[new MySQLDriver(), 'ALTER TABLE `products` ADD COLUMN `last_name` varchar(30) NOT NULL DEFAULT \'\'']]);
}