[rspec-users] Spec''ing a block

Morten Møller Riis
Mon, 05 Dec 2011 15:13:26 -0000

Hi Matt

Thank you for your reply!

I mock things like FileUtils for the following reasons: to avoid testing
FileUtils which I reckon has its own test suite and to avoid doing potentially
harmful things locally or having specs fail because of insufficient permissions
etc. I know the last bit could be worked out, but for things like #rm_r I do
like just to mock them.

Please let me know if this is not best practice. I know one can
"over-mock" a spec suite, but I generally tend to mock things that are
tested/spec''ed themselves.

Mvh
Morten M?ller Riis



On Dec 5, 2011, at 3:39 PM, Matt Wynne wrote:

>
> On 5 Dec 2011, at 12:04, Morten M?ller Riis wrote:
>
>> Hi folks
>>
>> How would you spec something like this:
>>
>>   as_user username do
>>     FileUtils.chmod_R 0755, "#{directory}/*"
>>   end
>>
>> Where as_user fires off a new process (and set uid to username).
>>
>> It seems that this won''t catch FileUtils.chmod_R:
>>
>> FileUtils.should_receive(:chmod_R).with(0755,
"#{@domain.directory}/*")
>>
>> I guess that is because it is passed in the block and fired off in a
seperate process (Process.fork).
>
>
> It depends on what you want to prove.
>
> If you want to prove that this bit of code will set the actual flags on the
actual file, then why not let it do it, and then check that the file ends up how
you want it to? If it''s happening in a forked process, you''ll
need to wait for the process to close to be sure it''s done, but
otherwise that should be quite straightforward, and will give you confidence
that the whole thing is working.
>
> Otherwise, you need to put a layer around the whole detail of forking and
running the FileUtils command, and put your mock assertion against that layer.
Right now you''re trying to introduce your mock into the stuff that
happens in the forked process, which isn''t going to work.
>
> cheers,
> Matt
>
> --
> Freelance programmer & coach
> Author, http://pragprog.com/book/hwcuc/the-cucumber-book (with Aslak
Helles?y)
> Founder, http://relishapp.com
> +44(0)7974430184 | http://twitter.com/mattwynne
>
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