Before:
  call ale#test#SetDirectory('/testplugin/test')

After:
  call ale#test#RestoreDirectory()

Execute(ale#python#UvPresent is true when a uv environment is present):
  call ale#test#SetFilename('test-files/python/uv/whatever.py')

  AssertEqual
  \  ale#python#UvPresent(bufnr('%')),
  \  1

Execute(ale#python#UvPresent is false when no uv environment is present):
  call ale#test#SetFilename('test-files/python/no_uv/whatever.py')

  AssertEqual
  \  ale#python#UvPresent(bufnr('%')),
  \  0