Trying to include a recipe that includes ohai::default

ohai.rb

include_recipe "ohai"

ohai_spec.rb

require 'spec_helper'

describe 'ohai example' do
  let(:chef_run) do
    runner = converge_chef_run
    end
    runner.converge 'ohai'
  end
  it "should include ohai and not break" do
      expect(chef_run).to include_recipe 'ohai'
  end
end

output

be rspec spec/ohai_spec.rb

================================================================================
Recipe Compile Error in /var/folders/98/my9tl6c977dcn_kj67bx19100000gp/T/chefspec-berks20130523-91327-17za2te/ohai/recipes/default.rb
================================================================================

TypeError
---------
can't convert nil into String

Cookbook Trace:
---------------
  /var/folders/98/my9tl6c977dcn_kj67bx19100000gp/T/chefspec-berks20130523-91327-17za2te/ohai/recipes/default.rb:51:in `read'
  /var/folders/98/my9tl6c977dcn_kj67bx19100000gp/T/chefspec-berks20130523-91327-17za2te/ohai/recipes/default.rb:51:in `from_file'

Relevant File Content:
----------------------
/var/folders/98/my9tl6c977dcn_kj67bx19100000gp/T/chefspec-berks20130523-91327-17za2te/ohai/recipes/default.rb:

 44:  resource = ohai 'custom_plugins' do
 45:    action :nothing
 46:  end
 47:
 48:  # only reload ohai if new plugins were dropped off OR
 49:  # node['ohai']['plugin_path'] does not exists in client.rb
 50:  if reload_ohai ||
 51>>   !(::IO.read(Chef::Config[:config_file]) =~ /Ohai::Config\[:plugin_path\]\s*<<\s*["']#{node['ohai']['plugin_path']}["']/)
 52:
 53:    resource.run_action(:reload)
 54:  end
 55:

F

Failures:

  1) ohai example should include ohai and not break
     Failure/Error: runner.converge 'ohai'
     TypeError:
       can't convert nil into String
     # /var/folders/98/my9tl6c977dcn_kj67bx19100000gp/T/chefspec-berks20130523-91327-17za2te/ohai/recipes/default.rb:51:in `read'
     # /var/folders/98/my9tl6c977dcn_kj67bx19100000gp/T/chefspec-berks20130523-91327-17za2te/ohai/recipes/default.rb:51:in `from_file'
     # ./spec/ohai_spec.rb:6:in `block (2 levels) in <top (required)>'
     # ./spec/ohai_spec.rb:9:in `block (2 levels) in <top (required)>'

Finished in 0.03731 seconds
1 example, 1 failure

Failed examples:

rspec ./spec/ohai_spec.rb:8 # ohai example should include ohai and not break

spec_helper.rb

require 'chefspec'
require 'berkshelf'
require 'tmpdir'
require 'fileutils'

TOPDIR = File.expand_path(File.join(File.dirname(__FILE__), ".."))
$: << File.expand_path(File.dirname(__FILE__))

Berkshelf.ui.mute!
berks = Berkshelf::Berksfile.from_file(File.join(TOPDIR, "Berksfile"))
tmpdirname = Dir.mktmpdir("chefspec-berks")
berks.install(path: tmpdirname, only: "external")
COOKBOOK_PATH = tmpdirname

RSpec.configure do |c|
  c.after(:all) do
    FileUtils.rm_rf(tmpdirname)
  end
end

def converge_chef_run()
  ChefSpec::ChefRunner.new(cookbook_path: COOKBOOK_PATH, platform: 'ubuntu', version: '12.04', log_levl: :debug) do |node|
  end
end