[#11278] Add testcase for StreamCountInterceptor

[emeroad]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 37.08%. Comparing base (20f58bf) to head (d353c41).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...p/pinpoint/grpc/server/StreamCountInterceptor.java	75.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #11595      +/-   ##
============================================
+ Coverage     37.06%   37.08%   +0.01%     
- Complexity    12282    12283       +1     
============================================
  Files          4047     4047              
  Lines         99317    99323       +6     
  Branches      10467    10468       +1     
============================================
+ Hits          36815    36829      +14     
+ Misses        59511    59499      -12     
- Partials       2991     2995       +4     

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