Ruby

# To overcome Ruby's "Module Inclusion Problem", whenever a module

# is included into FileUtils, then the sub-modules re-include

# FileUtils to ensure inclusion of the new module as well.

#

def self.include(mod)

super mod

extend self

[Verbose, NoWrite, DryRun].each do |base|

base.send(:include, self) #FileUtils)

base.extend(base) # extend self

end

end

#

require 'fileutils'

require 'test/unit'

class TestFileUtilsInclusion < Test::Unit::TestCase

module Foo

def foo?; true; end

end

def test_include_into_all_submodules

::FileUtils.send(:include, Foo)

assert ::FileUtils.ancestors.include?(Foo)

assert ::FileUtils::NoWrite.ancestors.include?(Foo)

assert ::FileUtils::Verbose.ancestors.include?(Foo)

assert ::FileUtils::DryRun.ancestors.include?(Foo)

assert ::FileUtils::NoWrite.foo?

assert ::FileUtils::Verbose.foo?

assert ::FileUtils::DryRun.foo?

assert ::FileUtils.foo?

end

def test_includes_streamutils

assert_include(::FileUtils::Verbose.private_instance_methods(true), :fu_stream_blksize)

end

end