From: "J. B. Rainsberger" <jbrains762@...>
Date: 2006-11-28T11:44:49+09:00
Subject: Mocha and ActiveRecord

Everyone:

I've been using Mocha, which I rather love, to help me test-drive some 
Rails code. I've run up against something a little clunky, and I'm 
hoping one of you can help me out.

Suppose I have an Order, which has_many OrderItems. Suppose I want to 
write a test that checks that when I ask the Order to do something, it 
asks its order items to do that something. I tried to do this like so:

def test_delegates
     order_items = []
     3.times {
         item = mock("order item", :do_something => nil)
         order_items.push(item)
     }

     order = Order.new(:order_items => order_items)
     order.do_something
end

This works with normal objects, but it seems ActiveRecord objects don't 
like someone passing them Mocha::Mock objects in their constructors. 
They check that the order items, in this case, are OrderItem objects.

Is there something in ActiveRecord I can override to relax this 
behavior? I don't like having to create an OrderItem just to add a 
single stub or expectation.

Thanks for your help.
-- 
J. B. (Joe) Rainsberger :: http://www.jbrains.ca
Your guide to software craftsmanship
JUnit Recipes: Practical Methods for Programmer Testing
2005 Gordon Pask Award for contribution Agile Software Practice