rspec2 - how to pass block to RSpec "with" expectation -

tet have class

class foo < activerecord::base    def set_publication       publication.new |publication|         publication.owner_type = 'foo'         publication.owner_id   =  123       end       return 'something else'   end end 

question: how can test block publication new instance receive

describe foo, 'set_publication'   let(:foo){ foo.new }        publication.should_recive(:new).with( ??????? ).and_return( double(:something) )     foo.set_publication   end end 

of course example of complicated functionality in cannot use hash arguments this

class foo < activerecord::base    def set_publication      publication.new owner_type: 'foo', owner_id: 123               return 'something else'   end end 

and test this

describe foo, 'set_publication'   let(:foo){ foo.new }        publication.should_recive(:new).with( owner_type: "foo", owner_id: 123 ).and_return( double(:something) )     foo.set_publication   end end 

thank you

---

update: seems it's bit unclear i'm asking here, :

i'm looking way ensure publication.new called explicitly set of arguments, in case block

so suppose

publication.should_receive(:new).with(&block) # example 

where block parameters owner_type == 'foo' , owner_id == 123

you can use and_yield accomplish this.

class foo   def set_publication     publication.new |publication|       publication.owner_type = 'foo'       publication.owner_id   =  123     end     return 'something else'   end end  class publication   attr_accessor :owner_id, :owner_type    def initialize     yield self if block_given?   end end 

and spec

describe foo    let(:foo) { foo.new }   let!(:publication) { publication.new }        publication.should_receive(:new).and_yield(publication)      foo.set_publication      publication.owner_type.should eq 'foo'     publication.owner_id.should eq 123   end end