Implement testkits for server tests

[tisonkun]

No description provided.

[jyz0309]

Does this mean that we need to re-implement a TestKit and let it gradually replace utils/testkit? Or just make changes to the original testkit?
A little concern, now testkit is used by many test. If we make changes to the original testkit directly, this is a big change.

[tisonkun]

Hi @jyz0309 ! Thanks for your interest. I'm going to choose

• re-implement a TestKit and let it gradually replace utils/testkit

That is in the plan and we will create testkit with go testing & testify. We use go-check for matchers almost and it won't be too complex. #26022 (comment)

[tisonkun]

Fixed by a series of PR referred above. With #26712 merged, what we have to do is only migrating tests and add few methods of Result or TestKit on demand.

Closing...