Ruby nested modules/classes figuring out their namespace (edited to work with Ruby < 2.0)

nested_parent.rb

class Module
  def namespace
    path = name.split('::')[0...-1]
    path.reduce(Object) { |namespace, const| namespace.const_get(const) }
  end
end

nested_parent_spec.rb

module A
  module B
    module C
    end
  end
end

describe Module do
  it 'knows its parent' do
    A::B::C.namespace.should be A::B
    A::B.namespace.should be A
    A.namespace.should be Object
  end
end