**Problem:**
1. Vitest tests were failing with 'Cannot find module .../test/setup.ts'
when testing functions in nested directories (e.g., extensions/discord/).
2. Root cause had two parts:
- _is_vitest_workspace() was doing substring search for 'workspace',
matching it even in comments, causing false positives
- Custom vitest config wasn't overriding setupFiles, leaving relative
paths from original config that resolved incorrectly
**Solution:**
1. Improved workspace detection (vitest_runner.py:172-191):
- Use regex to match actual workspace config patterns
- Match defineWorkspace( function calls
- Match workspace: [ property assignments
- Ignore 'workspace' in comments
2. Override setupFiles in custom config (vitest_runner.py:235-242):
- Set setupFiles: [] to disable project setup files
- Prevents relative path resolution issues
- Safe since Codeflash tests are self-contained
**Testing:**
Added test_vitest_setupfiles_fix.py with 2 test cases:
- Verifies setupFiles is overridden in generated config
- Verifies configs without setupFiles still work
**Trace ID:** 161e21be-9306-4a4d-a9dc-978f65a1af7a
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
