General improvement of tests

[marcosbento]

• Apply consistent format to tests name (i.e. output shown at runtime)
• Reduce the number of direct uses of std::cout in test implementation

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.75949% with 152 lines in your changes missing coverage. Please review.

Project coverage is 47.15%. Comparing base (d7abfaf) to head (51f2ff1).

Files with missing lines	Patch %	Lines
libs/test/TestZombies.cpp	0.00%	19 Missing ⚠️
libs/core/test/TestStr.cpp	37.93%	18 Missing ⚠️
libs/test/TestWhyCmd.cpp	0.00%	12 Missing ⚠️
libs/core/test/TestLog.cpp	50.00%	10 Missing ⚠️
libs/core/test/TestSanitizerUB.cpp	52.94%	8 Missing ⚠️
libs/test/TestTime.cpp	0.00%	7 Missing ⚠️
libs/core/test/TestNodePath.cpp	40.00%	6 Missing ⚠️
libs/core/test/TestSanitizerAS.cpp	50.00%	6 Missing ⚠️
libs/test/TestRepeat.cpp	0.00%	6 Missing ⚠️
libs/core/test/TestCalendar.cpp	75.00%	4 Missing ⚠️
... and 32 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #122      +/-   ##
===========================================
+ Coverage    47.07%   47.15%   +0.07%     
===========================================
  Files         1179     1181       +2     
  Lines        93310    93472     +162     
  Branches     14744    14736       -8     
===========================================
+ Hits         43929    44078     +149     
- Misses       49381    49394      +13     

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