serverspec if condition error - puppet

Question

I have below code in puppet
if $::operatingsystemmajrelease < 7 {
file { '/etc/sudoers' :
ensure => present,
owner => 'root',
group => 'root',
mode => '0440',
content => template('sudo/sudoers.erb'),
}
}
I wrote serverspec for this
require 'spec_helper'
if os[:release] == '6'
describe file('/etc/sudoers') do
it { should exist }
it { should be_owned_by 'root' }
it { should be_grouped_into 'root' }
it { should be_mode 440 }
its(:content) { should match /Defaults requiretty/}
end
end
1) why I am getting below message
No examples found.
Finished in 0.00038 seconds (files took 0.44176 seconds to load)
0 examples, 0 failures
My os version is 6 so it should compile my serverspec code but why its failing to execute all the examples.
The serverspec is working if I change it to if os[:release] < '7'
2) Also it { should be_mode 440 } doesn't support if I give it { should be_mode 0440 } 4 number octet matching.
getting below error
File "/etc/sudoers" should be mode 288
On host `localhost'
Failure/Error: it { should be_mode 0440 }
expected `File "/etc/sudoers".mode?(288)` to return true, got false
/bin/sh -c stat\ -c\ \%a\ /etc/sudoers\ \|\ grep\ --\ \\\^288\\\$
# ./spec/localhost/sudo_spec.rb:9:in `block (2 levels) in <top (required)>'
Finished in 0.05873 seconds (files took 0.48314 seconds to load)

Answer 1

1) Normally os[:release] contains values like '6.5'. So the correct way to do the comparison would be for example:
if os[:release].to_i == 6
Or:
if os[:release].split('.')[0] == '6'
2) Because the numbers with leading zeros are converted from octal (0440) to decimal (288) by Ruby, and Serverspec (Specinfra) passes it in decimal-to-string format to the underlying grep command.