Remove usage of _chunks from tests

[Swatinem]

This field is private and should not be accessed directly. I’m about to remove it in the future.

[codecov-notifications]

Codecov Report

All modified and coverable lines are covered by tests ✅

✅ All tests successful. No failed tests found.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.88%. Comparing base (5df99ba) to head (b479b97).
Report is 5 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1189   +/-   ##
=======================================
  Coverage   95.88%   95.88%           
=======================================
  Files         493      493           
  Lines       16851    16851           
=======================================
  Hits        16157    16157           
  Misses        694      694           

Flag	Coverage Δ
unit	95.88% <ø> (ø)

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