```ruby
require 'spec_helper'

describe 'postfix::augeas' do

  let :pre_condition do
    "include ::augeas"
  end

  on_supported_os.each do |os, facts|
    context "on #{os}" do
      let(:facts) do
        facts.merge({
          :augeasversion => '1.2.0',
          :puppetversion => Puppet.version,
        })
      end

      it { is_expected.to compile.with_all_deps }

      it { is_expected.to contain_augeas__lens('postfix_transport').with({
        :ensure       => 'present',
        :lens_content => %r{Parses /etc/postfix/transport},
        :test_content => %r{Provides unit tests and examples for the <Postfix_Transport> lens.},
        :stock_since  => '1.0.0',
      } ) }
      it { is_expected.to contain_augeas__lens('postfix_virtual').with({
        :ensure       => 'present',
        :lens_content => %r{Parses /etc/postfix/virtual},
        :test_content => %r{Provides unit tests and examples for the <Postfix_Virtual> lens.},
        :stock_since  => '1.0.0',
      }) }
    end
  end
end
```

Fix error in spec file.
user
```ruby
require 'spec_helper'

describe 'postfix::augeas' do

  let :pre_condition do
    "include ::augeas"
  end

  on_supported_os.each do |os, facts|
    context "on #{os}" do
      let(:facts) do
        facts.merge({
          :augeasversion => '1.2.0',
          :puppetversion => Puppet.version,
        })
      end

      it { is_expected.to compile.with_all_deps }

      it { is_expected.to contain_augeas__lens('postfix_transport').with({
        :ensure       => 'present',
        :lens_content => %r{Parses /etc/postfix/transport},
        :test_content => %r{Provides unit tests and examples for the <Postfix_Transport> lens.},
        :stock_since  => '1.0.0',
      } ) }
      it { is_expected.to contain_augeas__lens('postfix_virtual').with({
        :ensure       => 'present',
        :lens_content => %r{Parses /etc/postfix/virtual},
        :test_content => %r{Provides unit tests and examples for the <Postfix_Virtual> lens.},
        :stock_since  => '1.7.0',
      }) }
    end
  end
end
```
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