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