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import unittest
def find_repeat(xs):
n = max(xs)
expected_sum = (n + 1) * n / 2
actual_sum = sum(xs)
return actual_sum - expected_sum
# Tests
class Test(unittest.TestCase):
def test_short_list(self):
actual = find_repeat([1, 2, 1])
expected = 1
self.assertEqual(actual, expected)
def test_medium_list(self):
actual = find_repeat([4, 1, 3, 4, 2])
expected = 4
self.assertEqual(actual, expected)
def test_long_list(self):
actual = find_repeat([1, 5, 9, 7, 2, 6, 3, 8, 2, 4])
expected = 2
self.assertEqual(actual, expected)
unittest.main(verbosity=2)
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