public function testAddUniqueOnField()
{
$obj = new LeanObject("TestObject");
$obj->addUnique("tags", "frontend");
$this->assertEquals(array("frontend"), $obj->get("tags"));
$obj->addUnique("tags", "frontend");
$this->assertEquals(array("frontend"), $obj->get("tags"));
$obj->addUnique("tags", "javascript");
$this->assertEquals(array("frontend", "javascript"), $obj->get("tags"));
}