Feature Request: Improve gomega matchers

[aelsabbahy]

Describe the feature:

Improve gomega matchers.

Describe the solution you'd like

1. Allow transforms. For example the following should work (fixes Check if param is gt than #350)

kernel-param:
  net.core.somaxconn:
    value:
      gt: 5000

2. Add more gomega matchers, for example, the matchallelements matcher for slices.
   https://onsi.github.io/gomega/#gstruct-testing-complex-data-types

[pedroMMM]

@aelsabbahy besides matchallelements any other matchers you have in mind?

Maybe the 2 requests should be broken into 2 different issues/PRs? If they are broken apart this could be easier to create and review as well.

[aelsabbahy]

Yeah, they probably should be broken apart into two tickets and your ticket is the third enhancement on the gomega matchers for io.

[aelsabbahy]

@pedroMMM Finally got some time to hammer out my thoughts on this.. feels good since I've wanted to make progress on this concept forever now.

Check out the following PR: #576

For usage examples take a look at this:
https://github.com/aelsabbahy/goss/tree/add_transforms/examples

It works.. but unit tests are broken and the code is quickly thrown together and can use some love. I probably won't be available next week.. but if you're interested in this.. feel free to take my branch and run with it =)

This + Sprig + Per-package/service drivers = goss v0.4.0 milestone for me.