lint: make test config explicit

[ferhatelmas]

follow up on #318

addresses the request from this comment by explicitly including test files into lint

[codecov-io]

Codecov Report

Merging #320 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #320   +/-   ##
======================================
  Coverage    57.3%   57.3%           
======================================
  Files          19      19           
  Lines         904     904           
======================================
  Hits          518     518           
  Misses        335     335           
  Partials       51      51

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 74a3885...06fa900. Read the comment docs.

[corneliusweig]

This setting is true by default (see https://github.com/golangci/golangci-lint/blob/d2b1eea2c6171a1a1141a448a745335ce2e928a1/.golangci.example.yml#L16). Is there a particular reason why you want to make that explicit?

[ferhatelmas]

Yes, it's true by default but as in the linked comment, @ahmetb suggested to make it explicit unless hurts.

[corneliusweig]

Hmm.. if either of you feel strongly about making this explicit, I won't say no. But it feels a bit redundant.

[ahmetb]

I think it's fine, if someday the default changes, we're shielded.

/lgtm
/approve
thanks.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahmetb, ferhatelmas

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [ahmetb]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment