[rspec-users] Rails - Mock going out of scope?

David Chelimsky dchelimsky at gmail.com
Thu Jul 19 00:02:21 EDT 2007


You might also want to try this w/ another mock framework like mocha
or flexmock (or rr if you're on edge). If you do, please report the
results here.

Thx

On 7/18/07, David Chelimsky <dchelimsky at gmail.com> wrote:
> Would you mind posting the migrations?
>
> On 7/18/07, Mikel Lindsaar <raasdnil at gmail.com> wrote:
> > Heya David,
> >
> > Thanks for the reply.
> >
> > No, that didn't work, get the same error:
> >
> > NoMethodError in 'Node instance should return it's parent's language
> > if it is a child'
> > You have a nil object when you didn't expect it!
> > The error occurred while evaluating nil.name
> >
> >
> > If I include the fixture :languages, then replace out @language =
> > mock_model... with
> >
> > @language = languages(:one)
> >
> > it all works dandy.  But I'm trying to ween myself off fixtures :)
> >
> > Regards
> >
> > Mikel
> >
> >
> >
> > On 7/19/07, David Chelimsky <dchelimsky at gmail.com> wrote:
> > > On 7/18/07, Mikel Lindsaar <raasdnil at gmail.com> wrote:
> > > > Hello list,
> > > >
> > > > I think I have a rails related RSpec problem with a mock going out of
> > > > scope on a recursive call to a model.
> > > >
> > > > The code is at: http://pastie.textmate.org/79821 if you want to see it
> > > > highlighted.  I have pasted it below as well.
> > > >
> > > > Basically, I have an acts_as_nested_set model called "Node", which
> > > > works fine.  I have a function which finds the language name of the
> > > > node instance.  If the language is nil for the node instance being
> > > > queried, it then recursively calles language_name on it's parent until
> > > > one of them has the language.  Then this gets returned.
> > > >
> > > > When I do this with a fixture, it works fine.  Ie, a Database call can
> > > > be made to a language table and I get the language name.
> > > >
> > > > In the code attached it has a langauge instance being mocked.  I get
> > > > the same result if I mock Language.should_receive(:find)...
> > > >
> > > > It SEEMS like the Mock is going out of scope on the recursive call to
> > > > parent.  The direct spec to the parent to get language name works
> > > > fine.
> > > >
> > > > Any ideas? (the code below is slimmed down to the code needed to run the spec.
> > > >
> > > > Regards
> > > >
> > > > Mikel
> > > >
> > > > CODE::
> > > >
> > > > class Node < ActiveRecord::Base
> > > >
> > > >   belongs_to :language
> > > >   acts_as_nested_set :scope => :root_id
> > > >
> > > >   def language_name
> > > >     self.root? ? language.name : parent.language_name
> > > >   end
> > > > end
> > > >
> > > > describe Node, "instance" do
> > > >
> > > >   fixtures :nodes
> > > >
> > > >   before(:each) do
> > > >     @language = mock_model(Language, :name => "Japanese")
> > > >     @node = Node.create!(:language => @language)
> > > >     @section1 = Node.create!()
> > > >     @chapter1 = Node.create!()
> > > >   end
> > > >
> > > >   it "should return it's own language if it is root" do  # Passes
> > > >     @language.should_receive(:name).exactly(:once).and_return("Japanese")
> > > >     @node.language_name.should == "Japanese"
> > > >   end
> > > >
> > > >   it "should return it's parent's language if it is a child" do #
> > > > Fails (message below)
> > > >     @section1.move_to_child_of(@node)
> > > >     @chapter1.move_to_child_of(@section1)
> > > >     @language.should_receive(:name).exactly(:once).and_return("Japanese")
> > > >     @section1.language_name.should == "Japanese"
> > > >     @language.should_receive(:name).exactly(:once).and_return("Japanese")
> > > >     @chapter1.language_name.should == "Japanese"
> > > >   end
> > > > end
> > >
> > > It's generally not recommended that you set expectations, invoke them
> > > and then set them again. I'm not sure, but that may be the problem
> > > here. Try this:
> > >
> > >   it "should return it's parent's language if it is a child" do #
> > > Fails (message below)
> > >     @section1.move_to_child_of(@node)
> > >     @chapter1.move_to_child_of(@section1)
> > >     @language.should_receive(:name).exactly(:twice).and_return("Japanese")
> > >     @section1.language_name.should == "Japanese"
> > >     @chapter1.language_name.should == "Japanese"
> > >   end
> > >
> > > Does that work?
> > >
> > > >
> > > > SPEC ERROR::
> > > >
> > > > NoMethodError in 'Node instance should return it's parent's language
> > > > if it is a child'
> > > > You have a nil object when you didn't expect it!
> > > > The error occurred while evaluating nil.name
> > > > /Users/mikel/working/universal_translator/config/../app/models/node.rb:29:in
> > > > 'language_name'
> > > > /Users/mikel/working/universal_translator/config/../app/models/node.rb:29:in
> > > > 'language_name'
> > > > ./spec/models/node_spec.rb:160:
> > > > script/spec:4:
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