```ruby
require 'serverspec'
require 'pathname'

PROJECT_ROOT = (Pathname.new(File.dirname(__FILE__)) + '..').expand_path

Dir[PROJECT_ROOT.join("spec/support/**/*.rb")].each { |file| require(file) }

module Serverspec
  module Backend
    class Ssh
      def do_check(cmd)
        if cmd =~ /invalid/
          { :stdout => '', :stderr => '', :exit_status => 1, :exit_signal => nil }
        else
          { :stdout => ::RSpec.configuration.stdout, :stderr => '', :exit_status => 0, :exit_signal => nil }
        end
      end
    end
  end
end

RSpec.configure do |c|
  c.add_setting :stdout, :default => ''
end
```

Add c.stderr and some fixes
user
```ruby
require 'serverspec'
require 'pathname'

PROJECT_ROOT = (Pathname.new(File.dirname(__FILE__)) + '..').expand_path

Dir[PROJECT_ROOT.join("spec/support/**/*.rb")].each { |file| require(file) }

module Serverspec
  module Backend
    class Ssh
      def do_check(cmd)
        if cmd =~ /invalid/
          {
            :stdout      => ::RSpec.configuration.stdout,
            :stderr      => ::RSpec.configuration.stderr,
            :exit_status => 1,
            :exit_signal => nil
          }
        else
          {
            :stdout      => ::RSpec.configuration.stdout,
            :stderr      => ::RSpec.configuration.stderr,
            :exit_status => 0,
            :exit_signal => nil
          }
        end
      end
    end
  end
end

RSpec.configure do |c|
  c.add_setting :stdout, :default => ''
  c.add_setting :stderr, :default => ''
end
```
assistant