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From: Simon Wright <simon@pushface.org>
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Subject: Re: Is Aunit helpful?
Date: Fri, 13 Aug 2010 20:34:20 +0100
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"Yannick Duchêne (Hibou57)" <yannick_duchene@yahoo.fr> writes:

> About AUnit: just seen about what it is, how it is set up and how it
> works. Seems a question is still pending : “how to be sure the test
> cover all relevant case ?”. I do not see a way to be sure testing
> cover all cases. That is the main limitation of this kind of
> approach. May be this is nice for regression tests and tests cases
> revealed during application's life time... however, I don't believe
> this can be used too much soon in a development stage. Pretty sure
> this is best used just after real use or deployment has been started.

gcov
(http://gcc.gnu.org/onlinedocs/gcc-4.5.0/gnat_ugn_unw/Code-Coverage-of-Ada-Programs-using-gcov.html#Code-Coverage-of-Ada-Programs-using-gcov)
will help to tell which bits of code your tests haven't exercised at
all. And it's free.

For more capable test coverage tools you'll probably have to pay.