[SOLVED] How to test readonly property of Puppet type

I have Puppet type defined like this:

Puppet::Type.newtype(:my_type) do
  newproperty(:id, :readonly => true) do
    desc "Some id."
  end
end

I want to ask how to test in rspecs that property :id is readonly?

describe Puppet::Type.type(:netapp_e_volume) do
  it 'should have readonly :id attribute' do
    # this part I don't have
  end
end

As of April of 2016 this is still not possible according to this Puppet Jira Ticket

The tickect is still in Unresolved state