def test_normalize_row(self):
normalizer = Normalizer()
self.assertEqual(normalizer.normalize_row('a'), 'a')
self.assertEqual(normalizer.normalize_row('B'), 'b')
self.assertEqual(normalizer.normalize_row('1'), '1')
self.assertEqual(normalizer.normalize_row('Row C'), 'c')
self.assertEqual(normalizer.normalize_row('row 12'), '12')
self.assertEqual(normalizer.normalize_row('r31'), '31')
self.assertEqual(normalizer.normalize_row('Cc'), 'cc')
self.assertEqual(normalizer.normalize_row('37Wc '), '37')
self.assertEqual(normalizer.normalize_row('A-Z '), 'a-z')
self.assertEqual(normalizer.normalize_row('AA-XX '), 'aa-xx')
self.assertEqual(normalizer.normalize_row('1-10 '), '1-10')
