Incorrect wrong number of arguments exception when stubbing find

I’m working with a subclass of ActiveResource and I came across this
oddity when trying to stub its find method. Occurring with rspec
1.3.0:

The spec code looks like:

[1,2].each {|id|
Hive::CategoryResource.should_receive(:find).with(id).and_raise(ActiveResource::ResourceNotFound)}
Hive::CategoryResource.should_receive(:find).with(3).and_return(gg_parent)

The code being called looks like

return Hive::CategoryResource.find(c.hive_category_id).default_weight


And the exception looks like:

wrong number of arguments (0 for 1)

/home/michael/.rvm/gems/ruby-1.8.7-p249/gems/rspec-1.3.0/lib/spec/
mocks/message_expectation.rb:113:in initialize' /home/michael/.rvm/gems/ruby-1.8.7-p249/gems/rspec-1.3.0/lib/spec/ mocks/message_expectation.rb:113:inexception’
/home/michael/.rvm/gems/ruby-1.8.7-p249/gems/rspec-1.3.0/lib/spec/
mocks/message_expectation.rb:113:in raise' /home/michael/.rvm/gems/ruby-1.8.7-p249/gems/rspec-1.3.0/lib/spec/ mocks/message_expectation.rb:113:ininvoke’
/home/michael/.rvm/gems/ruby-1.8.7-p249/gems/rspec-1.3.0/lib/spec/
mocks/proxy.rb:127:in invoke_expectation' /home/michael/.rvm/gems/ruby-1.8.7-p249/gems/rspec-1.3.0/lib/spec/ mocks/proxy.rb:111:inmessage_received’
/home/michael/.rvm/gems/ruby-1.8.7-p249/gems/rspec-1.3.0/lib/spec/
mocks/proxy.rb:177:in find' /home/michael/Scripts/admin/app/models/category.rb:392:inclosest_default_weight’
/home/michael/Scripts/admin/app/models/category.rb:389:in each' /home/michael/Scripts/admin/app/models/category.rb:389:inclosest_default_weight’
./spec/models/category_spec.rb:209


I was hoping someone could help me figure out what’s going on here.
It’s making an area of my code particularly hard to test

On Sep 13, 2010, at 5:30 PM, Michael Xavier wrote:

I’m working with a subclass of ActiveResource and I came across this
oddity when trying to stub its find method. Occurring with rspec
1.3.0:

The spec code looks like:

[1,2].each {|id|
Hive::CategoryResource.should_receive(:find).with(id).and_raise(ActiveResource::ResourceNotFound)}

ActiveResource::ResourceNotFound.new requires arguments, so you have to
pass in an instance instead.

http://rspec.rubyforge.org/rspec/1.3.0/classes/Spec/Mocks/BaseExpectation.html#M000072

Maybe we just need a better error message.

HTH,
David

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