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...ionality, add_vehical is the method to add objects to the stack. My sort_by method in the comparer class looks like def sort_by(symb) @vehicals.sort_by{|vehical| vehical[symb] } end where @vehicals is an instance variable array (the stack). Running my spec gives the following error, Mocha::ExpectationError in ''Comparer should be sortable on a specific symbol'' #<Mock:0x251b7c8>.[](:mph) - expected calls: 0, actual calls: 1 I assume sort_by is trying to call a [] method ? How do I stub this method correctly using Mocha ? Thank you for any help, Chris -- Chris Lowis...