[rspec-users] Mocking expectations on I/O operations

Rob Aldred
2011-09-15T09:05:59Z

Thanks Justin,
That isnt working... its erroring with:

The method `delete` was not stubbed or was already unstubbed

--
Rob Aldred

Software Developer
rob at stardotstar.com
twitter: stardotstar

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On Thursday, 15 September 2011 at 01:52, Justin Ko wrote:

>
>
> On Wed, Sep 14, 2011 at 6:51 AM, Rob Aldred <rob at stardotstar.com
(mailto:rob at stardotstar.com)> wrote:
> >  I''m speccing a small lib which manipulates image files using
mini_magick.
> >  The lib creates various temporary files during the process, the lib
then cleans up the temporary files at the end.
> >
> >  I''m trying to mock expectations that the calls are made to
File#delete
> >
> >  Eg...
> >
File.should_receive(:delete).once.with("#{generator.tmp_path}-full\.png")
> >
File.should_receive(:delete).once.with("#{generator.tmp_path}-screen\.png")
> >
File.should_receive(:delete).once.with("#{generator.tmp_path}-shadow\.png")
> >
> >  The method in the lib that does this is:
> >
> >  Class IconGenerator
> >  ...
> >
> > private
> >
> > def cleanup
> > # remove temporary files created during
> > # image manipulation
> >
[''-full'',''_screen'',''_shadow'',''_back_shadow''].each
do |f|
> > File.delete "#{tmp_path}#{f}.png" if File.exists?
"#{tmp_path}#{f}.png"
> > end
> > end
> >  ...
> >  end
> >
> >  The expectations work fine, however, I also have an after block which
also calls File.delete to clean up the final version of the manipulated test
image
> >
> >  after(:each) do
> > # cleanup manipulated image
> > File.delete out_dir.join(''MenuIcon.png'') if
File.exists? out_dir.join(''MenuIcon.png'')
> > end
> >
> >  The File.delete call in the after block fails because its calling the
mocked version of File.delete
> >  This results in the following error:
> >
> >  Failure/Error: File.delete
out_dir.join(''MenuIcon.png'') if File.exists?
out_dir.join(''MenuIcon.png'')
> >  NoMethodError:
> >  undefined method `=~'' for
#<Pathname:/Users/robaldred/Sites/egg/tmp/MenuIcon.png>
> >
> >
> >  My next step was to stub the write method for every instance of
MiniMagick::Image
> >  However I will then no longer be able to test the cleanup because the
delete method will never be called if the files don''t exist.
> >
> >  I''m pretty sure I''m going about this the wrong way
and making it difficult for myself here.
> >  Appreciate any help & feedback
> >
> >  Thanks
> > --
> >  Rob
> >
> >  _______________________________________________
> >  rspec-users mailing list
> > rspec-users at rubyforge.org (mailto:rspec-users at rubyforge.org)
> > http://rubyforge.org/mailman/listinfo/rspec-users
>
> Give `File.unstub(:delete)` in your `after` block.
>
> Attachments:
> - ATT00001..txt
>