Extend PI tests

[jwillemsen]

* tests/pi/current/server_orb_initializer.cpp:
* tests/pi/current/server_request_interceptor.cpp:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.80%. Comparing base (8177f77) to head (8f66cf3).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #382      +/-   ##
==========================================
+ Coverage   59.75%   59.80%   +0.04%     
==========================================
  Files         596      596              
  Lines       47580    47581       +1     
  Branches     4215     4215              
==========================================
+ Hits        28432    28454      +22     
+ Misses      16031    16006      -25     
- Partials     3117     3121       +4     

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