Implement specs

[Arcanemagus]

It looks like this linter does not currently have any specs written for it, adding it to the list being maintained here for tracking.

Specs do not need to be super detailed, as they should mainly test whether the package is properly running the linter plugin and parsing its messages. Leave testing of the linter functionality to the author of the linter.

If you need any help feel free to ask!

[AsaAyers]

This extension does so little on its own that I don't see what meaningful tests should be written. I really don't see how any meaningful tests would verify dependencies. I marked this help wanted because I'm just going to leave this up to someone else to contribute tests.