Add test cases to cover all RESTful APIs

[ahrtr]

What would you like to be added?

Please read #16454 (comment) .

• Add test cases to cover all KV REST API.
  • Only /v3/kv/deleterange and /v3/kv/compaction are not covered yet.
  • test: move all KV related RESTful APIs into a separate test file #16509
  • test: refactor the existing KV RESTful test cases and also add new cases #16511
• Add test cases to cover cluster REST API.
  • Let's add a new file v3_curl_cluster_test.go.
  • test: add test cases to cover cluster RESTful APIs #16545
• Add test cases to cover maintenance REST API.
  • test: add v3 curl test to cover all maintenance REST API #16489
• Add test cases to cover auth REST API
  • Some APIs have already been covered in v3_curl_test.go. Let's move all auth related REST API into a separate file e.g. v3_curl_auth_test.go, and also add new cases to cover the APIs which aren't covered before.
  • test: move all auth related test cases into a separate test file #16518
  • test: add e2e test cases to cover all auth related RESTful APIs #16527
• Add test cases to cover all election REST API
  • test: split watch and election tests to separate files #16564
  • test: add test case to cover all election REST APIs #16570
• Add test cases to cover all lock REST API
  • test: add test case to cover lock restful APIs #16553

Why is this needed?

See above

[serathius]

I would suggest trying to reuse small subset of existing grpc test. We should avoid duplicating code for testing as tests are already hard to maintain.

[ahrtr]

I would suggest trying to reuse small subset of existing grpc test. We should avoid duplicating code for testing as tests are already hard to maintain.

Do not understand the point at all. Please elaborate. Where is the duplication?

[ahrtr]

All done!