Re: What I hate about *Unit frameworks.

Google's test framework for C++ allows for "death tests" where a separate process is spun up, executed to run a test, and stderr (I think) + result code examined. if the test doesn't cause that process to error out "properly" it is counted as a failure. I suppose there is a time-out involved. (Been a while since I've looked at the code.)

While that gTest framework doesn't come with "sharding (tests spread over threads, processes, or CPUs), that feature could be implemented in your own test-launcher (and something like that might already be used at Google, just not open-sourced.

C. Keith Ray

On Apr 30, 2013, at 4:30 PM, John Carter <[email protected]> wrote:

> Most of them invest way too much effort to make up for the deficiencies of
> the Windows Operating system.
> 
> The Component in a Computer tasked with managing concurrency, task
> separation, and ensuring full clean setup and tear down is....
> 
> The Operating System.
> 
> So if you want to be dead, 100% sure that this test doesn't corrupt that
> test... you use a process.
> 
> Nope, not try / catch, not exception handling. That's a flaky almost
> solution.
> 
> One test === One Process.
> 
> Each process is an address space that appears.... and vanishes.
> 
> But, but, but Processes Are HeavyWeight you can't create and run thousands
> of processes!
> 
> Oh yes you can.
> 
> Processes are lightweight under Unix and have been for decades.
> 
> In fact much of the hype about threads is a result of Microsoft marketing
> spin to cope with the fact that Windows 3.1 processes were incredibly
> heavyweight kludges.
> 
> In fact there are relatively few places where one should use threads when
> one can use processes.
> 
> Want to run a thousand tests? Well, how many cores do you have? Let's keep
> every core 100% busy. One test, one core.
> 
> But who is going to spin all those processes and mind the result?
> 
> GNU parallel is a pretty nifty choice.
> 
> Or maybe it is something the xUnit's should be doing.
> 
> -- 
> John Carter Phone : (64)(3) 358 6639
> Tait Electronics Fax : (64)(3) 359 4632
> PO Box 1645 Christchurch Email : [email protected]
> New Zealand
> 
> -- 
> 
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