pytest-dev__pytest-8365
Based on the issue description and my knowledge of pytest's codebase, I can provide the fix. The issue is in src/_pytest/tmpdir.py where getpass.getuser() is used to create the basetemp directory name, and the username may contain…
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Based on the issue description and my knowledge of pytest's codebase, I can provide the fix. The issue is in `src/_pytest/tmpdir.py` where `getpass.getuser()` is used to create the basetemp directory name, and the username may contain characters like backslash (`\`) that are illegal in directory names on Windows.
The fix should sanitize the username by replacing illegal characters. Here's the patch:
--- a/src/_pytest/tmpdir.py
+++ b/src/_pytest/tmpdir.py
@@ -1,4 +1,5 @@
"""Support for providing temporary directories to test functions."""
+import re
import tempfile
from pathlib import Path
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