Before: Save g:ale_python_autopep8_executable Save g:ale_python_autopep8_options " Use an invalid global executable, so we don't match it. let g:ale_python_autopep8_executable = 'xxxinvalid' let g:ale_python_autopep8_options = '' call ale#test#SetDirectory('/testplugin/test/fixers') let g:dir = getcwd() let b:bin_dir = has('win32') ? 'Scripts' : 'bin' After: Restore unlet! b:bin_dir call ale#test#RestoreDirectory() Execute(The autopep8 callback should return the correct default values): silent execute 'file ' . fnameescape(g:dir . '/../test-files/python/with_virtualenv/subdir/foo/bar.py') AssertEqual \ {'command': ale#Escape(ale#path#Simplify(g:dir . '/../test-files/python/with_virtualenv/env/' . b:bin_dir . '/autopep8')) . ' -'}, \ ale#fixers#autopep8#Fix(bufnr('')) Execute(The autopep8 callback should include options): let g:ale_python_autopep8_options = '--some-option' silent execute 'file ' . fnameescape(g:dir . '/../test-files/python/with_virtualenv/subdir/foo/bar.py') AssertEqual \ {'command': ale#Escape(ale#path#Simplify(g:dir . '/../test-files/python/with_virtualenv/env/' . b:bin_dir . '/autopep8')) . ' --some-option -' }, \ ale#fixers#autopep8#Fix(bufnr('')) Execute(pipenv is detected when python_autopep8_auto_pipenv is set): let g:ale_python_autopep8_auto_pipenv = 1 call ale#test#SetFilename('../test-files/python/pipenv/whatever.py') AssertEqual \ { \ 'command': ale#Escape('pipenv') . ' run autopep8 -', \ }, \ ale#fixers#autopep8#Fix(bufnr('')) Execute(Poetry is detected when python_autopep8_auto_poetry is set): let g:ale_python_autopep8_auto_poetry = 1 call ale#test#SetFilename('../test-files/python/poetry/whatever.py') AssertEqual \ { \ 'command': ale#Escape('poetry') . ' run autopep8 -', \ }, \ ale#fixers#autopep8#Fix(bufnr('')) Execute(uv is detected when python_autopep8_auto_uv is set): let g:ale_python_autopep8_auto_uv = 1 call ale#test#SetFilename('../test-files/python/uv/whatever.py') AssertEqual \ { \ 'command': ale#Escape('uv') . ' run autopep8 -', \ }, \ ale#fixers#autopep8#Fix(bufnr(''))