Ok, last one - for your interest validates_length_of can be used for 
this purpose. There is an open bug/patch on the rails trac regarding the 
:within parameter but the :minimum works fine for me. As for the example 
the method called on @item.images is #size and not #count so
 -> @item.images.should_receive(:size).and_return(1)

P.S.: The bug on the rails trac: http://dev.rubyonrails.org/ticket/11295
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