```ruby
require_relative 'spec_helper'

shared_examples_for 'exhibitor' do
  describe port '8080' do
    it { should be_listening.with 'tcp6' }
  end
end
```

Drop TCP6 specificity to fix CentOS testing
user
```ruby
require_relative 'spec_helper'

shared_examples_for 'exhibitor' do
  describe port '8080' do
    it { should be_listening }
  end
end
```
assistant