Puppet users - Aug 2014 - puppet rspec with hiera helper, fails with error when class is parameterized

Hi,
I have two classes as posted in this gist.

https://gist.github.com/msapariya/eca9f77c9f560f8a0e57

kp_ls derives from params and defines two variables.

I am using hiera-puppet-helper in my specs to run hiera
related tests.

However the test is failing with 

 1) kp_ls
     Failure/Error: it { should compile }
     Puppet::Error:
       Error from DataBinding 'hiera' while looking up
'kp_ls::somevar':
FileSystem implementation expected Pathname, got: 'Hash' on node 
testhost.example.com
     # ./spec/classes/init_spec.rb:17:in `block (2 levels) in <top 
(required)>'


If I disable the class parameters, the tests are running fine.
I could not get any clue from code or even googling the issue.

Thanks for any help.
Regards,
Manish

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