fix: allow FIFOs as test files

[alxndrsn]

Closes #5511

PR Checklist

• test case(s)
• Addresses an existing open issue: fixes 🐛 Bug: cannot execute tests from FIFOs #5511
• [not yet] That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Support running tests from FIFOs.

[linux-foundation-easycla]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.68%. Comparing base (f4e7e54) to head (389a4c8).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5512   +/-   ##
=======================================
  Coverage   93.68%   93.68%           
=======================================
  Files          57       57           
  Lines        4384     4384           
  Branches      846      846           
=======================================
  Hits         4107     4107           
  Misses        277      277           

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