Make sure the tests use mock maker with intended member accessor

[reta]

Make sure the tests use mock maker with intended member accessor
Fixes #2855

Checklist

• Read the contributing guide
• PR should be motivated, i.e. what does it fix, why, and if relevant how
• If possible / relevant include an example in the description, that could help all readers
  including project members to get a better picture of the change
• Avoid other runtime dependencies
• Meaningful commit history ; intention is important please rebase your commit history so that each
  commit is meaningful and help the people that will explore a change in 2 years
• The pull request follows coding style
• Mention Fixes #<issue number> in the description if relevant
• At least one commit should mention Fixes #<issue number> if relevant

[codecov-commenter]

Codecov Report

Base: 84.76% // Head: 84.76% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (36ab2f2) compared to base (f4d7c34).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 36ab2f2 differs from pull request most recent head 3d7e0d2. Consider uploading reports for the commit 3d7e0d2 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #2872   +/-   ##
=========================================
  Coverage     84.76%   84.76%           
- Complexity     2867     2868    +1     
=========================================
  Files           327      327           
  Lines          8780     8784    +4     
  Branches       1068     1068           
=========================================
+ Hits           7442     7446    +4     
- Misses         1064     1065    +1     
+ Partials        274      273    -1     

Impacted Files	Coverage Δ
...l/configuration/plugins/DefaultMockitoPlugins.java	92.50% <100.00%> (+0.60%)	⬆️
...internal/configuration/plugins/PluginRegistry.java	100.00% <100.00%> (ø)
...ernal/configuration/plugins/PluginInitializer.java	66.66% <0.00%> (-4.77%)	⬇️
...creation/bytebuddy/SubclassByteBuddyMockMaker.java	50.00% <0.00%> (+2.70%)	⬆️

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[TimvdLippe]

Nice! Now we know for sure we have covered all cases. Great work once again :)