Fix: Use more appropriate message when detecting protected method in anonymous class

[localheinz]

This pull request

• adds a test case for an anonymous class
• uses a more appropriate message when detecting a protected method in an anonymous class

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.48%. Comparing base (8b2a546) to head (3102451).
Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #890      +/-   ##
============================================
+ Coverage     97.45%   97.48%   +0.03%     
- Complexity      203      204       +1     
============================================
  Files            23       23              
  Lines           706      717      +11     
============================================
+ Hits            688      699      +11     
  Misses           18       18              

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