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    possible duplicate of Unit testing - one test is partly a "superset" of another, is this wrong? Commented Jan 12, 2015 at 15:41
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    @GlenH7 - this seems like a different question. The other is "if you have functions where A calls B and returns the same result, should you test both A and B". This is more about the tests being overlapping rather than the function(s) under test. (Though it's confusing as they're currently named). Commented Jan 12, 2015 at 15:46
  • possible duplicate of How should I test the functionality of a function that uses other functions in it? Commented Jan 12, 2015 at 17:03
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    Stricly speaking these tests aren't really overlapping (they don't have success dependency). A function lambda: type('', (), {'__len__': lambda self: 2})() will pass the first, but not the second. Commented Jan 12, 2015 at 19:40
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    @GlenH7: FWIW, I did not really change the question, just tried to make it gnat-safe ;-) (@gnat: no offense, just joking!) Commented Jan 13, 2015 at 16:02