(maint) - Fix incorrect test for file_path

[jordanbreen28]

Summary

Fixes a unit test wrongly configured in #334.
The invalid_directories? method should return true if passed a path that exists, but is a file. As we did not mock File.exists? the incorrect test went unnoticed.

Additional Context

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• Root cause and the steps to reproduce. (If applicable)
• Thought process behind the implementation.

Related Issues (if any)

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Checklist

• 🟢 Spec tests.
• 🟢 Acceptance tests.
• Manually verified.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.08%. Comparing base (5603c13) to head (463a1ba).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #335   +/-   ##
=======================================
  Coverage   92.08%   92.08%           
=======================================
  Files           6        6           
  Lines         720      720           
=======================================
  Hits          663      663           
  Misses         57       57           

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