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controller 


					
		
		
def whatever
  @foo = Foo.find params[:id]
end

				
		

		

	
	





spec 





	
	

		

		

			
				
				

					
		
		
before(:each) do
  @foo = stub_model(Foo)
  Foo.stub!(:find).with(params[:id]).and_return(@foo)
  # i expect you set the params[:id] somewhere.
  # don't complain when it's nil.
  # you set it manually or whatever.
end