Improving UT coverage for filesystem module

[trisha-dell]

Description

Improving UT coverage for filesystem module

Checklist:

• I have performed a self-review of my own code to ensure there are no formatting, pep8, linting, or security issues
• I have performed Ansible Sanity test using --docker default
• I have verified that new and existing unit tests pass locally with my changes
• I have not allowed coverage numbers to degenerate
• I have maintained at least 90% code coverage
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• Backward compatibility is not broken

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also list any relevant details for your test configuration

• Unit testing

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

Attention: Patch coverage is 99.16318% with 2 lines in your changes missing coverage. Please review.

Project coverage is 84.75%. Comparing base (c5b1405) to head (d1cc92d).
Report is 32 commits behind head on main.

Files with missing lines	Patch %	Lines
plugins/modules/filesystem.py	85.71%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #123      +/-   ##
==========================================
+ Coverage   81.90%   84.75%   +2.84%     
==========================================
  Files         124      133       +9     
  Lines       13463    14822    +1359     
  Branches     1989     2156     +167     
==========================================
+ Hits        11027    12562    +1535     
+ Misses       1830     1637     -193     
- Partials      606      623      +17     

Flag	Coverage Δ
units	84.75% <99.16%> (+2.84%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.