/**
* test grabbing a Favorite that does not exist
**/
public function testGetInvalidFavoriteByTweetIdAndProfileId()
{
// grab a tweet id and profile id that exceeds the maximum allowable tweet id and profile id
$favorite = Favorite::getFavoriteByTweetIdAndProfileId($this->getPDO(), DataDesignTest::INVALID_KEY, DataDesignTest::INVALID_KEY);
$this->assertNull($favorite);
}