Which command test for file existance on Windows.
Add unit tests for which command.
Remove copy/paste nonsense.
Fix test runner.
Add system tests for which command.
Do not run tests on non-Windows platforms.
Refactor as per review.
Moved which command to BrinkFilesystem.
Fix linter error.
Update docstring.
Fix unicode issues with Twisted.
Remove seesaw files.
Update to latest libs.
Refactor to new which implementation.
Clean tests.
Update nsis code.
Refactor tests after review changes.
Add tests and fix previous tests.
Fix tempfolder on Windows. Extract test common code.
Shorten test code to essential part.