Puppet users - Apr 2013 - Testing fail message for case selector

Hi Folks,

I''m new to puppet and rspec and like to write a unit test that checks
if an
fail message is raised in case my module is run on non-supported operating 
system, so I wrote something like the code below, but I end-up if an error 
of ''No matching value for selector Darwin''. 

# my_module/manifests/init.pp
class myclass inherits myclass::params {
  case $::operatingsystem {
    debian, ubuntu: {}
    default: { fail("${::hostname}: Module ${::module_name} does not 
support operatingsystem ${::operatingsystem}") }
  }
}

# spec/classes/init_spec.rb

require ''spec_helper''

describe "graylog2", :type => ''class'' do  
  context ''On ubuntu systems'' do
  let(:facts) { {:operatingsystem => ''Ubuntu'', :kernel
=> ''Linux''} }
  it {should include_class(''myclass::params'')}
  end

  context ''On non-ubuntu systems'' do
    let(:facts) { {:operatingsystem => ''Darwin'', :kernel
=> ''Linux''} }
    it do
      expect {
        should include_class(''myclass::params'')
      }.to raise_error(Puppet::Error, /does not support operatingsystem/)
    end
  end
end

How should I write such test?

Thanks for the help,

Eric

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