Add a test of .pth handling. #343

Job	Run time
Pre-commit checks / Pre-commit Checks	10s
Unit tests (macOS-app, 3.13)	2m 2s
Unit tests (macOS-Xcode, 3.9)	5m 19s
Unit tests (macOS-Xcode, 3.10)	3m 28s
Unit tests (macOS-Xcode, 3.11)	3m 55s
Unit tests (macOS-app, 3.11)	2m 0s
Unit tests (macOS-Xcode, 3.12)	5m 35s
Unit tests (macOS-app, 3.10)	2m 25s
Unit tests (macOS-app, 3.9)	2m 28s
Unit tests (macOS-app, 3.12)	2m 19s
Unit tests (macOS-Xcode, 3.13)	3m 40s
Unit tests (linux-flatpak, 3.11)	4m 58s
Unit tests (android, 3.13)	5m 16s
Unit tests (iOS, 3.12)	5m 55s
Unit tests (windows-app, 3.11)	3m 11s
Unit tests (iOS, 3.13)	6m 53s
Unit tests (android, 3.9)	5m 53s
Unit tests (windows-VisualStudio, 3.12)	4m 33s
Unit tests (linux-flatpak, 3.12)	5m 23s
Unit tests (windows-app, 3.9)	3m 6s
Unit tests (iOS, 3.10)	11m 18s
Unit tests (windows-app, 3.10)	3m 8s
Unit tests (linux-flatpak, 3.13)	5m 16s
Unit tests (linux-system, system, ubuntu-latest, sudo apt update -y && sudo apt install -y --no-i...	1m 43s
Unit tests (iOS, 3.9)	9m 17s
Unit tests (android, 3.12)	6m 5s
Unit tests (android, 3.11)	6m 10s
Unit tests (windows-VisualStudio, 3.9)	4m 9s
Unit tests (windows-app, 3.13)	3m 34s
Unit tests (linux-flatpak, 3.10)	4m 56s
Unit tests (windows-VisualStudio, 3.13)	3m 39s
Unit tests (linux-flatpak, 3.9)	5m 38s
Unit tests (windows-app, 3.12)	3m 31s
Unit tests (windows-VisualStudio, 3.11)	4m 9s
Unit tests (windows-VisualStudio, 3.10)	4m 6s
Unit tests (android, 3.10)	5m 24s
Unit tests (iOS, 3.11)	6m 42s
	2h 47m 14s

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