Sandbox-sensitive test

[pbsds]

Describe the bug
A clear and concise description of what the bug is.

This part of the pytest test TestUIUIFileDialog.test_process_event:

pygame_gui/tests/test_windows/test_ui_file_dialog.py

Lines 399 to 404 in cc1c41d

	file_dialog.file_path_text_line.set_text('/')
	file_dialog.process_event(pygame.event.Event(UI_TEXT_ENTRY_FINISHED,
	{'ui_element': file_dialog.file_path_text_line}))
	assert Path(file_dialog.current_directory_path).name == ''

fails with

>       assert Path(file_dialog.current_directory_path).name == ''
E       AssertionError: assert 'images' == ''
E         
E         + images

when ran in a nix sandbox on macos. I think it assumes / has the x permission?

uncovered in NixOS/nixpkgs#352150 (comment)

To Reproduce
Steps to reproduce the behaviour:

nix build --system aarch64-darwin github:nixos/nixpkgs/refs/pull/352150/head#python311Packages.pygame-gui --check

Expected behaviour
build success

Platform and software (please complete the following information):

• OS: nixos 24.05
• Pygame GUI version: 0.6.2
• Pygame version: 2.5.2 CE edition (also reproduced on 2.5.1)