I'm going to go ahead and change this in order to get rid of the trailing whitespace.  I'm also going to set an expectation on `Facter::Util::Resolution.exec` in the spec file so we avoid executing ifconfig in the tests, which will fail on Windows and such.

```ruby
Facter::Util::Resolution.exec([self.get_ifconfig.to_s, *additional_arguments].join(' '))
```