Test: add test cases

[iamazy]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 10.11236% with 80 lines in your changes are missing coverage. Please review.

Project coverage is 22.73%. Comparing base (c92028c) to head (e945da6).

Files	Patch %	Lines
helyim/src/directory/server.rs	0.00%	22 Missing ⚠️
helyim/src/storage/api/mod.rs	0.00%	20 Missing ⚠️
helyim/src/storage/api/erasure_coding.rs	0.00%	18 Missing ⚠️
helyim/src/util/http/extractor.rs	0.00%	5 Missing ⚠️
helyim/src/directory/api.rs	69.23%	4 Missing ⚠️
helyim/src/raft/mod.rs	0.00%	4 Missing ⚠️
helyim/src/client/mod.rs	0.00%	3 Missing ⚠️
helyim/src/storage/server.rs	0.00%	3 Missing ⚠️
helyim/src/topology/volume_grow.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #115      +/-   ##
==========================================
+ Coverage   19.61%   22.73%   +3.12%     
==========================================
  Files          75       76       +1     
  Lines        4828     4790      -38     
==========================================
+ Hits          947     1089     +142     
+ Misses       3881     3701     -180     

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