```ruby
require 'spec_helper'

describe 'zaqar' do
  
  let :facts do
        {
      :osfamily => 'Debian'
    }
  end

  let :default_params do
        {}
  end

  [
    {},
    {}
  ].each do |param_set|

    describe "when #{param_set == {} ? "using default" : "specifying"} class parameters" do
      
      let :param_hash do
                param_set == {} ? default_params : params
      end

      let :params do param_set end

      it { should contain_file('/etc/zaqar/').with(
        'ensure'  => 'directory',
        'owner'   => 'zaqar',
        'mode'    => '0770'
      )}

    end
  end

  describe 'on Debian platforms' do
        let :facts do
            { :osfamily => 'Debian' }
    end
    let(:params) { default_params }

    it {should_not contain_package('zaqar')}
  end

  describe 'on RedHat platforms' do
        let :facts do
            { :osfamily => 'RedHat' }
    end
    let(:params) { default_params }

    it { should contain_package('openstack-zaqar')}
  end

end
```

Use expect instead of should
user
```ruby
require 'spec_helper'

describe 'zaqar' do
  
  let :facts do
        {
      :osfamily => 'Debian'
    }
  end

  let :default_params do
        {}
  end

  [
    {},
    {}
  ].each do |param_set|

    describe "when #{param_set == {} ? "using default" : "specifying"} class parameters" do
      
      let :param_hash do
                param_set == {} ? default_params : params
      end

      let :params do param_set end

      it { should contain_file('/etc/zaqar/').with(
        'ensure'  => 'directory',
        'owner'   => 'zaqar',
        'mode'    => '0770'
      )}

    end
  end

  describe 'on Debian platforms' do
        let :facts do
            { :osfamily => 'Debian' }
    end
    let(:params) { default_params }

    it {should_not contain_package('zaqar')}
  end

  describe 'on RedHat platforms' do
        let :facts do
            { :osfamily => 'RedHat' }
    end
    let(:params) { default_params }

    it { expect contain_package('openstack-zaqar')}
  end

end
```
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