expecting-blocks.rb

require 'test/unit'
require 'mocha'

class MyTest < Test::Unit::TestCase
  
  class X
    class << self
      def foo(&block)
        append_before_filter do
          bar &block
        end
      end
      def append_before_filter(&block); end
    end
  end
  
  def test_me
    X.expects(:bar).yields
    X.stubs(:append_before_filter).yields
    my_block_called = false
    X.foo do
      my_block_called = true
    end
    assert my_block_called
  end
  
end