Extract a common base class for test parsers

[uhafner]

Remove some duplications in the test parsers.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (f57f7d0) 95.61% compared to head (4d3c5e5) 95.53%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
...ava/edu/hm/hafner/coverage/parser/NunitParser.java	88.23%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #70      +/-   ##
============================================
- Coverage     95.61%   95.53%   -0.09%     
  Complexity      784      784              
============================================
  Files            28       29       +1     
  Lines          2008     1993      -15     
  Branches        285      282       -3     
============================================
- Hits           1920     1904      -16     
- Misses           44       45       +1     
  Partials         44       44              

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[github-actions]

☀️ Quality Monitor

• 🚦 Tests: 284 tests passed
• 👣 Code Coverage: 96% coverage achieved
• 🔬 Mutation Coverage: 93% mutations killed
• ⚠️ Style: No warnings found
• 🐛 Bugs: No warnings found

More details are available in the GitHub Checks Result.

[github-actions]

☀️ Quality Monitor

• 🚦 Tests: 284 tests passed
• 👣 Code Coverage: 96% coverage achieved
• 🔬 Mutation Coverage: 93% mutations killed
• ⚠️ Style: No warnings found
• 🐛 Bugs: No warnings found

More details are available in the GitHub Checks Result.