test: fix deprecation for setAccessible()

[Chris53897]

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 100.00%. Comparing base (4dd9a03) to head (2b79135). :warning: Report is 17 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##                main       #46   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity         9         9           
===========================================
  Files              1         1           
  Lines             16        16           
===========================================
  Hits              16        16           

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