'Test change_nzb_dir'

def test_change_nzb_dir(self):

    sickbeard.NZB_DIR = ''
    self.assertTrue(config.change_nzb_dir('cache'))
    self.assertFalse(config.change_nzb_dir('/:/NZB_Downloads'))
    self.assertTrue(config.change_nzb_dir(''))
