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TotT: Understanding Your Coverage Data

Thursday, March 06, 2008
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7 comments :

  1. Andrew BinstockMarch 6, 2008 at 12:28:00 PM PST

    nice explanation that code coverage is not the same as path coverage

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  2. UnknownMarch 7, 2008 at 5:51:00 AM PST

    I would have liked the article to mention object (assembly) level testing. If you define your test cases using breakpoints at every branch (or jump) instruction you can observe every path. I.E. if(a||b) will be at least 2 branch instructions and force you to test both. Testing at object level will also highlight any dead code or logic inserted (or optimized) by the compiler/linker. This is the kind of testing required by DO-178B level A certification. FYI: DO-178B is an FAA specification required for civilian equipment that will fly in US Airspace.

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  3. Michael Bolton http://www.developsense.comMarch 7, 2008 at 11:17:00 AM PST

    Nice post, Dave; code coverage indeed isn't test coverage.

    Here are a couple of points that I think are important and necessary for to ask about test coverage, where code coverage simply begs the questions:

    1) Will the code in question work reliably?

    2) Do you care about performance in the system under test?

    3) So you've got code coverage--but isn't it testing only your code? It's not testing the code of the operating system, third-party libraries, hardware or firmware, or anything else on which your product depends? That is, code coverage indicates what code you've touched in the product--but we have to test not only the product, but the system--the product and all the things around it.

    4) Does your test coverage tell you about supportability, testability, maintainability, portability, and localizability?

    5) Does your test coverage address the issue of value? Code coverage can tell you if something has been done--but was that something useful?

    Cheers,

    ---Michael B.

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  4. Abhinav VaidMarch 12, 2008 at 3:42:00 AM PDT

    Amazing example on code coverage. But looks as if better said than done. Really wish if we lived in a perfect world. Blogging initiatives like the current one keeps the spirits live. Good guys.

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  5. Sachin DhallMarch 12, 2008 at 10:00:00 AM PDT

    great explanation, besides code coverage it also made me many more things to understand.

    Sachin

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  6. Sachin DhallMarch 12, 2008 at 10:01:00 AM PDT

    great explanation, besides code coverage it also made me understand many more things.

    Sachin

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  7. Lava KafleNovember 23, 2011 at 9:28:00 PM PST

    great article for code coverage and perfect testing logic

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