From: DeNigris Sean <sean@...>
Date: 2010-01-21T13:52:43+09:00
Subject: Why doesn't this work?

Hi list,

I can't figure out why this doesn't do what I expected...
# Spec file:
	context "showing Ruby reference materials" do
		it "should open the rspec book in preview" do
			require "sean/preview"
			class << ApplicationScripting::Preview
				def self.reference
					preview = double('Preview')
					preview.should_receive(:open).with('.../the-rspec-book_b12_0.pdf')
				end
			end

			require "sean/vim"
			class << ApplicationScripting::Vim
				def self.reference
					vim = double('Vim')
				end
			end

			VimPlugin::show_ruby_reference_materials
		end
	end

# Library file
class VimPlugin
	def self.show_ruby_reference_materials
		require "sean/preview"
		preview = ApplicationScripting::Preview.reference
		preview.open '/Users/sean/Downloads/the-rspec-book_b12_0.pdf'

		require "sean/vim"
		vim_screen = ApplicationScripting::Vim.reference.window(1).screen

		require "sean/screen"
		another_screen = System::Screen::screens.detect { |s| s != vim_screen }
		preview.window(1).frame = another_screen.available_frame
		preview.activate
	end
end

I was hoping that in the spec/test code, the mocked out version would be called, but it used the regular implementations instead.  I'm guessing that "self" is not being changed in the definitions, but if I open up the classes like:
module ::ApplicationScripting
	class Preview
		def self.reference
			preview = double('Preview')
			preview.should_receive(:open).with('.../the-rspec-book_b12_0.pdf')
		end
	end
end

I get "undefined method `double' for ApplicationScripting::Preview"

I'm out of ideas and I'm not getting what's going on on a deeper level here.

Thanks in advance!

Sean DeNigris