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POAny standard techniques, mechanisms,tools for generating exceptions for use with test code to thoroughly test C++?
 

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  1. POAny standard techniques, mechanisms,tools for generating exceptions for use with test code to thoroughly test C++?
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    <p>With Symbian's version of C++ it is possible to precisely control simulation of low memory conditions and thus deterministically generate a leave (a leave is Symbian C++'s equivalent to a throw) for all possible combinations of execution paths through your code based on allocation failure.</p> <p>This is incredibly useful for testing purposes, as the vast majority of leaves/exceptions within Symbian (i.e. on a constrained device) are as a consequence of low memory, it effectively means you can thoroughly test your code for exception safety. This invariably reveals many, many defects, including many not related to exception handling.</p> <p>For those of you who have a copy of Exceptional C++ to hand, refer to item 18 - imagine being able to generate conditions quite easily to test all 23 paths of execution through that code and the consequent benefit that has.</p> <p>So my question is, are there any mechanisms or techniques or tools that will enable you within test code to generate exceptions to thoroughly test the exception handling of code?</p> <p>Suppose you had to white box test the code in item 18 of Exceptional C++ (and please lets not get into discussions saying the code should be re-written, suppose it can't be) how could you test it to ensure all 23 paths of execution are being executed within test code?</p> <hr> <p>This question is not about Symbian, I use use it to provide some context to illustrate from experience the incredible benefit of being able to deterministically control the generation of exceptions for testing purposes, and thus wondering how to achieve the same in standard C++.</p>
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    1. USDavid Preston
    1. USDavid Preston
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      1. POAny standard techniques, mechanisms,tools for generating exceptions for use with test code to thoroughly test C++?
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    1. COI don't know anything about the Symbian stuff. How do you express the notion that a particular function call on a particular line of source code should fail (i.e. throw), whilst still having a maintainable unit test that isn't full of brittle insider knowledge?
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      1. POAny standard techniques, mechanisms,tools for generating exceptions for use with test code to thoroughly test C++?
      1. USOliver Charlesworth
    2. COThey use a naming convention which must be adherred to - functions that can "throw" are named with a trailing L in their name. And new is overloaded so it looks like "new (ELeave) T" which would result in an exception being thrown if the new can't succeed (calling new without (ELeave) is not permitted)
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      1. POAny standard techniques, mechanisms,tools for generating exceptions for use with test code to thoroughly test C++?
      1. USDavid Preston
    3. COI see. But how does your unit test trigger a *particular* `new` to fail?
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      1. POAny standard techniques, mechanisms,tools for generating exceptions for use with test code to thoroughly test C++?
      1. USOliver Charlesworth
 

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