MiniTest: A curious case of include (1.8 vs 1.9)

manual_includes.rb

require 'rubygems'
require 'minitest/spec'

module A
  module B
  end
end

class DirectInclude
  include A
end

class EvalInclude
end
EvalInclude.class_eval "include A"

class BlockInclude
end
block = lambda { include A }
BlockInclude.class_eval(&block)

class MethodEvalInclude
  class << self
    def class_include(&block)
      class_eval(&block)
    end
  end
end
MethodEvalInclude.class_include { include A }

describe "Manual Includes" do
  it "should show direct inclusion works" do
    DirectInclude::B.must_equal A::B
  end
  
  it "should show eval inclusion works" do
    EvalInclude::B.must_equal A::B
  end
  
  it "should show block inclusion works" do
    BlockInclude::B.must_equal A::B
  end
  
  it "should show method inclusion works" do
    MethodEvalInclude::B.must_equal A::B
  end
end

minitest_includes.rb

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
#
# See: http://groups.google.com/group/ruby-talk-google/browse_thread/thread/a8a516f8732150db

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!  It indicates some pollution
# of one spec with another.
#
# describe "MiniTest Assigns" do
#   B = A::B
#
#   it "should show assignment works" do
#     B.must_equal A::B
#   end
# end
#
# NOTE: it's actually pollution of the enclosing namespace!
# You can show this:
#
# puts B  # => 'A::B' on 1.8, error on 1.9 
#

# 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

# Here are some workarounds...
module M
  module N
  end

  describe "Nested" do
    it "should show nesting works" do
      N.must_equal M::N
    end
  end
end

describe "Full Constant Name" do
  it "should show full names works" do
    M::N.must_equal M::N
  end
end

MiniTest::Unit.autorun