Add file testing for Reek.
user
```ruby
# Example "borrowed" from https://github.com/troessner/reek#example
class Dirty
  # This method smells of :reek:NestedIterators but ignores them
  def awful(x, y, offset = 0, log = false)
    puts @screen.title
    @screen = widgets.map { |w| w.each { |key| key += 3 * x } }
    puts @screen.contents
  end
end
```
assistant