mocha developer - Sep 2007 - Expectations on portions of arguments called.

I''d like to create expectations on just portions of the arguments a
function takes.

For example, I want to verify that the a certain ActiveRecord
association extension adds an order clause to the find options hash.

Currently I simply check the entire argument structure, something like this

def test_referring_journals_should_order_by_citation_count
article = articles(:highly_cited_article)
Journal.expects(:find).with(
:all,
{
:order => ''citations_count DESC'',
:joins => nil,
:select => nil,
:offset => nil,
:conditions => ''article_id = 1''
}
)
article.referring_journals
end

The example is fabricated, but what I''d like to do is something perhaps
like:
def test_referring_journals_should_order_by_citation_count
article = articles(:highly_cited_article)
args = []
Journal.expects(:find, args)
article.referring_journals
assert_equal :all, args.shift
options = args.unshift
assert_equal ''citations_count DESC'', options[:order]
end

Just kicking the idea around.

You should be able to do this with the has_entry parameter matcher (
http://mocha.rubyforge.org/classes/Mocha/ParameterMatchers.html#M000010)
something like this...

def test_referring_journals_should_order_by_citation_count
  article = articles(:highly_cited_article)
  Journal.expects(:find).with(:first, has_entry(:order,
''citations_count
DESC''))
  article.referring_journals
end

Let me know if I''ve misunderstood.

-- 
James.
http://blog.floehopper.org
http://tumble.floehopper.org

Wow, I hadn''t seen those methods before.  Those do exactly what I need
in  99% of the cases I wished I had something like this.

Still though, there are times when having access to that arguments
array to do more programmatic checking, or deeper inspection of the
argument components would be nice.

Thanks for the quick response and excellent library.

On 9/12/07, James Mead <jamesmead44 at gmail.com>
wrote:
> You should be able to do this with the has_entry parameter matcher (
> http://mocha.rubyforge.org/classes/Mocha/ParameterMatchers.html#M000010)
> something like this...
>
> def test_referring_journals_should_order_by_citation_count
>   article = articles(:highly_cited_article)
>   Journal.expects(:find).with(:first, has_entry(:order,
''citations_count
> DESC''))
>   article.referring_journals
> end
>
> Let me know if I''ve misunderstood.
>
> --
> James.
> http://blog.floehopper.org
> http://tumble.floehopper.org
> _______________________________________________
> mocha-developer mailing list
> mocha-developer at rubyforge.org
> http://rubyforge.org/mailman/listinfo/mocha-developer
>

On 13/09/2007, Duncan Beevers <duncanbeevers at gmail.com>
wrote:
> Still though, there are times when having access to that arguments
> array to do more programmatic checking, or deeper inspection of the
> argument components would be nice.
There''s nothing to stop you writing your own custom parameter matcher
- in fact we often do this ourselves.
-- 
James.
http://blog.floehopper.org
http://tumble.floehopper.org