test: Extract File Action tests

[DrakeLin]

What changes are proposed in this pull request?

#780

Added unit tests for file action

How was this change tested?

[codecov]

Codecov Report

❌ Patch coverage is 93.42105% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.00%. Comparing base (d3c7323) to head (7826853).
⚠️ Report is 15 commits behind head on main.

Files with missing lines	Patch %	Lines
kernel/src/log_replay.rs	93.42%	2 Missing and 8 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1365      +/-   ##
==========================================
+ Coverage   84.81%   85.00%   +0.19%     
==========================================
  Files         113      114       +1     
  Lines       28647    29591     +944     
  Branches    28647    29591     +944     
==========================================
+ Hits        24297    25154     +857     
- Misses       3196     3222      +26     
- Partials     1154     1215      +61     

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