logged_in_as.rb

# Doesn't work when user arg is a reference to variable in an outer context
class Test::Unit::TestCase

  def self.logged_in_as(user, &block)
    context "logged in as #{user}" do
      setup do
        UserSession.create(user)
      end

      merge_block(&block) if block_given? 
    end
  end

end

# The Fix: Passing in var name as a string i.e. logged_in_as('@user') do ...
class Test::Unit::TestCase

  def self.logged_in_as(user, &block)
    context "logged in as #{user}" do
      setup do
        UserSession.create(eval(user))
      end

      merge_block(&block) if block_given? 
    end
  end

end