test_spec.rb

module Foo
  Bar = "test"
end

describe "Foo" do
  include Foo

  it "should be included in this context" do
    Bar.should == 'test'
  end
end

zresults

~/Desktop$ rvm use 1.9.2
Using /Users/jonas/.rvm/gems/ruby-1.9.2-p290
~/Desktop$ rspec test_spec.rb 
.

Finished in 1.88 seconds
1 example, 0 failures
~/Desktop$ rvm use 1.9.3
Using /Users/jonas/.rvm/gems/ruby-1.9.3-p0
~/Desktop$ rspec test_spec.rb 
F

Failures:

  1) Foo should be included in this context
     Failure/Error: Bar.should == 'test'
     NameError:
       uninitialized constant Bar
     # ./test_spec.rb:9:in `block (2 levels) in <top (required)>'

Finished in 0.26293 seconds
1 example, 1 failure

Failed examples:

rspec ./test_spec.rb:8 # Foo should be included in this context

o.O

What does puts self.class.ancestors on line 9 return?

Same happens with JRuby 1.6.5 o.O

self.class.ancestors returns RSpec::Core::ExampleGroup::Nested_1.