Running test suite leaves a top level folder "a-path-that-will-cause-an-OSError"

[MarkusPiotrowski]

Describe the bug

Running the test suite on Windows creates a top level folder named "a-path-that-will-cause-an-OSerror", which is not removed after the tests have finished.
E.g.:
D:/
|_ some other folder
|_ briefcase (the dev folder)
|_ a-path-that-will-cause-an-OSError
|_ more folders

Steps to reproduce

1. Set up a briefcase development environment on Wndows as described here: https://briefcase.readthedocs.io/en/latest/how-to/contribute-code.html
2. Run tox -e py

Expected behavior

All changes outside the dev folder and the /user/.../AppData/ folders should be reverted

Screenshots

No response

Environment

• Operating System: Windows 10 Home 21H2
• Python version: 3.8.8
• Software versions:
  • Briefcase: 0.3.14.dev151+g27996ba4

Logs

Additional context

No response

[mhsmith]

I've also noticed this.

[rmartin16]

Yeah. I've been meaning to fix this; thanks for documenting it. I may put together something today.....there's some other small testing issues I've noticed recently as well.