add test case for client constructor

[zhengjian526]

#119 add test case for client constructor

[github-actions]

Code Coverage Report
for detail, goto summary download Artifacts

Filename                    Functions  Missed Functions  Executed       Lines      Missed Lines     Cover    Branches   Missed Branches     Cover
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
client_util.hpp                     3                 1    66.67%          19                 8    57.89%           2                 1    50.00%
codec.h                             3                 0   100.00%          19                 2    89.47%           0                 0         -
connection.h                       34                 8    76.47%         344               123    64.24%          64                39    39.06%
io_service_pool.h                   5                 0   100.00%          32                 1    96.88%          12                 1    91.67%
md5.hpp                            19                 2    89.47%         127                 8    93.70%          24                 0   100.00%
nonstd_any.hpp                     13                10    23.08%          28                22    21.43%           0                 0         -
router.h                            9                 2    77.78%          80                32    60.00%          10                 6    40.00%
rpc_client.hpp                     63                30    52.38%         591               270    54.31%          98                63    35.71%
rpc_server.h                       20                 7    65.00%         156                51    67.31%          32                18    43.75%
string_view.hpp                    17                11    35.29%          38                30    21.05%           2                 2     0.00%
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
TOTAL                             186                71    61.83%        1434               547    61.85%         244               130    46.72%

[codecov-commenter]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (3e2746e) 44.02% compared to head (5c22ede) 46.87%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
tests/test_rest_rpc.cpp	88.88%	8 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #122      +/-   ##
==========================================
+ Coverage   44.02%   46.87%   +2.84%     
==========================================
  Files         168      166       -2     
  Lines        7666     7740      +74     
==========================================
+ Hits         3375     3628     +253     
+ Misses       4291     4112     -179     

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[qicosmos]

LGTM