public function testAddingEnum()
 {
     $blueprint = new Blueprint('users');
     $blueprint->enum('foo', array('bar', 'baz'));
     $statements = $blueprint->toSql($this->getConnection(), $this->getGrammar());
     $this->assertEquals(1, count($statements));
     $this->assertEquals('alter table "users" add "foo" nvarchar(255) not null', $statements[0]);
 }