undefined method `max_connections' for PostgreSQL

[atomic111]

Description

I add the following test to my inspec profile:

control 'postgres-12' do
  impact 1.0
  title 'Define max client connections'
  desc 'Define max client connections'
  describe postgres_conf do
    its('max_connections') { should eq '100' }
  end
end

and got the error:

postgres-12: Define max client connections (1 failed)
undefined method `max_connections' for PostgreSQL Configuration:Inspec::Resource::Registry::PostgresConf

I execute the test with:

inspec exec test/integration -t ssh://ubuntu@127.0.0.1 --port 2200 --key-files /home/user/projekte/chef_cookbooks/chef-postgres-hardening/.kitchen/kitchen-vagrant/kitchen-chef-postgres-hardening-default-ubuntu-1604/.vagrant/machines/default/virtualbox/private_key --sudo

If i execute the test within the inspec shell like this:
postgres_conf.params['max_connections'].eql?'100' I get the expected result:

inspec> postgres_conf.params['max_connections'].eql?'100'
=> true

InSpec and Platform Version

inspec version 0.27.0

Replication Case

I started the ubuntu 16.04 (https://atlas.hashicorp.com/ubuntu/boxes/xenial64/versions/20160627.0.0/providers/virtualbox.box)

I applied the chef-postgres-hardening cookbook. I can provide you access to my fork of the chef-postgres-hardening. Because i am switching the tests from serverspec to inspec for the project.

[chris-rock]

This issue has been fixes and is available with the next version of InSpec