```ruby
require 'spec_helper'

%w(cumulus rocket turtle).each do |username|
  describe user(username) do
    it { should exist }
    it { should belong_to_group 'sudo' }
  end
end
```

Remove tests for 'rocket' & 'turtle' users
user
```ruby
require 'spec_helper'

describe user('cumulus') do
  it { should exist }
  it { should belong_to_group 'sudo' }
end
```
assistant