From: Simon Chiang <simon.a.chiang@...>
Date: 2009-01-30T00:13:15+09:00
Subject: MiniTest: a curious case of include (1.8 vs 1.9)

I've been messing around with minitest and came across something very
strange.  Does anyone have an explanation for what is going on here?
I think it must indicate subtle differences in blocks between 1.8 and
1.9.

  require 'rubygems'
  require 'minitest/spec'

  #
  # Including a module in a spec does not make constants
  # available under ruby 1.8 but it does under ruby 1.9.
  #
  # This script requires the minitest gem to be installed:
  #
  #   % gem install minitest
  #

  module A
    module B
    end
  end

  # This passes on ruby 1.9, but not on 1.8.
  describe "MiniTest Includes" do
    include A

    it "should show inclusion works" do
      B.must_equal A::B
    end
  end

  # This passes on both.  What's more, if you uncomment this
  # spec, the assignment TRANSLATES to the "MiniTest Includes"
  # spec and that spec will pass!
  #
  # describe "MiniTest Assigns" do
  #   B = A::B
  #
  #   it "should show assignment works" do
  #     B.must_equal A::B
  #   end
  # end

  # Here is an example showing the assignment case works.
  module X
    module Y
    end
  end

  describe "MiniTest Assigns X::Y" do
    Y = X::Y

    it "should show constant assignment works" do
      Y.must_equal X::Y
    end
  end

  MiniTest::Unit.autorun