feat: remove unused code and refact test

[sysulq]

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[codecov-commenter]

Codecov Report

Merging #701 (5c9fecb) into master (6674f8d) will decrease coverage by 17.57%.
The diff coverage is 100.00%.

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@@             Coverage Diff             @@
##           master     #701       +/-   ##
===========================================
- Coverage   52.14%   34.57%   -17.57%     
===========================================
  Files         192      152       -40     
  Lines       10729     7895     -2834     
===========================================
- Hits         5595     2730     -2865     
- Misses       4710     4937      +227     
+ Partials      424      228      -196     

Impacted Files	Coverage Δ
pkg/util/xmap/util.go	46.00% <ø> (-23.36%)	⬇️
pkg/util/xstring/string.go	0.00% <ø> (-16.27%)	⬇️
proto/helloworld/v1/helloworld.pb.go	20.00% <ø> (ø)
test/e2e/client/redis.go	100.00% <ø> (ø)
test/e2e/framework/etcd.go	100.00% <ø> (ø)
test/e2e/framework/grpc.go	100.00% <ø> (ø)
test/e2e/framework/http.go	89.74% <ø> (ø)
test/e2e/framework/redis.go	100.00% <ø> (ø)
test/e2e/jupiter/grpc.go	100.00% <100.00%> (ø)
test/e2e/server/xecho.go	100.00% <100.00%> (ø)
... and 93 more

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