def test_odd_number_of_elements(self):
with self.assertRaises(ValueError):
puzzle2('1')
puzzle2('123')
puzzle2('12345')
def test_not_a_digit(self):
with self.assertRaises(ValueError):
puzzle2('abc123')
def test_no_matches(self):
self.assertEqual(puzzle2('12'), 0)
self.assertEqual(puzzle2('1221'), 0)
def test_matches(self):
self.assertEqual(puzzle2('1212'), 6)
self.assertEqual(puzzle2('123425'), 4)
self.assertEqual(puzzle2('123123'), 12)
self.assertEqual(puzzle2('12131415'), 4)
def test_empty(self):
self.assertEqual(puzzle2(''), 0)