fix: report sync error thrown after done() in async tests

[mostafaNazari702]

PR Checklist

• Addresses an existing open issue: fixes 🐛 Bug: Test stops recognizing exceptions once done has been called #4202
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Tests using done() could incorrectly pass if they called it synchronosly and then immediately threw an error afterward. Caused by the post-done() throw being treated as already handled that silently swallowed the error ( excuse me for the unprofessional way of describing ).

this fix detects throws that happen after done() completes and routes them through mocha’s existing multiple-done error handling causing the test to fail correctly and inntegration tests were added to verify the failure behavior and error message.

[mostafaNazari702]

Added a space in the end of the title to rerun tests.

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 80.89%. Comparing base (6695fba) to head (90b9e47).

Files with missing lines	Patch %	Lines
lib/runnable.mjs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5991      +/-   ##
==========================================
- Coverage   80.89%   80.89%   -0.01%     
==========================================
  Files          64       64              
  Lines        4602     4605       +3     
  Branches      976      996      +20     
==========================================
+ Hits         3723     3725       +2     
- Misses        879      880       +1     

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