rspec users - Oct 2007 - Mocking within a Proc/Block?

The following works:

   it "should evaluate a passed in block in the context of the  
interview object" do
     block = Proc.new { raise unless self.is_a? 
(Interview) }.should_not raise_error
     Interview.create(:title => "Text", &block)
   end

However, the following does not:

   it "should evaluate a passed in block in the context of the  
interview object" do
     block = Proc.new { self.should be_an_instance_of(Interview) }
     Interview.create(:title => "Text", &block)
   end

I''d far prefer to use the latter.  However
"be_an_instance_of" is not
defined on my Interview class per the interpreter.  While I''ve poked  
a little inside RSpec for insights, I''m just a tad too tired to dig  
in for an answer for this one.  Can someone help me out after  
clobbering me for what is likely to turn out to be a foolish question?

Thanks,
Evan

On 10/24/07, Evan David Light <evan at tiggerpalace.com>
wrote:
> The following works:
>
>    it "should evaluate a passed in block in the context of the
> interview object" do
>      block = Proc.new { raise unless self.is_a?
> (Interview) }.should_not raise_error
>      Interview.create(:title => "Text", &block)
>    end
>
> However, the following does not:
>
>    it "should evaluate a passed in block in the context of the
> interview object" do
>      block = Proc.new { self.should be_an_instance_of(Interview) }
>      Interview.create(:title => "Text", &block)
>    end
>
> I''d far prefer to use the latter.  However
"be_an_instance_of" is not
> defined on my Interview class per the interpreter.
That is correct. It gets evaluated, as your example narrative states:
in the context of the interview object.

How about something like this?

it "should evaluate ..." do
    $interview = nil
    Interview.create(:title => "Text") do
      $interview = self
    end
    $interview.should be_an_instance_of(Interview)
  end
end