'Test _get_storage_dir'

def test__get_storage_dir(self):

    test_cases = [None, 123, 12.3, u'', os.path.join(u'some', u'path', u'to', u'folder')]
    for nzb_dir in test_cases:
        sickbeard.NZB_DIR = nzb_dir
        self.assertEqual(NZBProvider(u'Test    Provider')._get_storage_dir(), nzb_dir)
