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high-scores: add tests to prevent solutions that mutate 'scores' #1874

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high-scores: add tests to prevent solutions that mutate 'scores' #1874

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21 changes: 21 additions & 0 deletions exercises/high-scores/high_scores_test.py
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,27 @@ def test_personal_top_when_there_is_only_one(self):
expected = [40]
self.assertEqual(personal_top_three(scores), expected)

def test_latest_doesnt_mutate_scores(self):
# make sure latest doesn't affect/damage our original object
scores = [20, 10, 30]
scores_backup = list(scores)
_unused = latest(scores)
self.assertEqual(scores, scores_backup)

def test_personal_best_doesnt_mutate_scores(self):
# make sure personal_best doesn't affect/damage our original object
scores = [20, 10, 30, 50, 40, 10]
scores_backup = list(scores)
_unused = personal_best(scores)
self.assertEqual(scores, scores_backup)

def test_personal_top_three_doesnt_mutate_scores(self):
# make sure personal_top_three doesn't affect/damage our original object
scores = [10, 30, 90, 30, 100, 20, 10, 0, 30, 40, 40, 70, 70]
scores_backup = list(scores)
_unused = personal_top_three(scores)
self.assertEqual(scores, scores_backup)


if __name__ == "__main__":
unittest.main()