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  1. #1
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    Negetive testing

    What would be the average effort on negative testing.Does every Functional test case need to be associated with anegative test case?.Or is negative test limited to few critical functions.

  2. #2
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    Re: Negetive testing

    Hi,
    It is difficult to answer this questions. It depends upon your project/application.
    If you have more of field validation, then negative testcase count will be more.
    Thanks & Regards,
    Palani.
    http://tips-testing.blogspot.com/index.html
    Quote: Donít hesitate to initiate!

  3. #3
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    Re: Negetive testing

    Negative testing is testing the software on the way it is not supposed to behave. More specifically, (industry standard test name: Forced Error Test or FET) consist
    of negative test cases that are designed to force the program into error conditions.

    These are some questions that needs to be answered. If the AUT is internally used, are the end users willing to accept minor nuisances, however, if it causes the AUT to crash then its another story. If the AUT is commercially used then almost every possible event would need to be tested.........but then again....did MSN!!!!

  4. #4
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    Re: Negetive testing

    The percentage of negative test cases will vary from project to project. As QBoy says, every possible event should have a testcase regardless of if its a negative or positive test case. Lack of time may mean you don't get around to executing all of your negative cases, but this should be documented for risk assessment purposes.

  5. #5
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    Re: Negetive testing

    I find that negative testing is an easy way to find bugs. Most developers do a good job to make sure that the software works correctly for what it is supposed to do. Many developers are not as diligent with the failure cases.

    Enjoy.
    It Depends.

  6. #6
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    Re: Negetive testing

    Yes, what alanark says, not only developers but designers, sales people, executives, end users, basically everyone with an interest in the product is typically thinking only about the positive cases. I think this is one of the main distinguishing characteristics of testers, the idea of negative testing comes naturally to them, they recognize it as simply the other side of the same coin as positive testing.

    As a percentage, well that totally depends and I'd imagine there's a wide range of practices out there. I'd expect we'd see projects with more negative than positive testing going on and also projects with almost no negative testing due to severe time constraints.

    Maybe this would be a good measure of overall test quality, how much negative testing is being done?

    I suppose theoretically there are more things a product might do that it isn't supposed to than the other way around so just in theory I guess there should always be more negative cases than positive?

  7. #7
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    Re: Negetive testing

    There are two sides of testing a software
    QA Bull

  8. #8
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    Re: Negetive testing

    There are two parts of testing a software.
    1. Testing the software for what is supposed to do (positive tetsing)
    2. Testing the software for what it is not supposed to do.( Negative testing)

    So, negative testing needs the same amount of effort or more if possible as on postive testing.
    QA Bull

  9. #9
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    Re: Negetive testing

    Agree, and I suspect this is where some confusion comes from when estimating both project timelines and degree of difficulty.

    Testers understand they need the neg stuff but that's not always apparent to everyone else so they underestimate the time.

    And, negative testing can be more challenging, so if you don't see that need you tend to underestimate the degree of skill needed to test properly.

 

 

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