Before: call ale#assert#SetUpLinterTest('python', 'jedils') Save b:ale_python_auto_virtualenv let b:bin_dir = has('win32') ? 'Scripts' : 'bin' After: unlet! b:bin_dir unlet! b:venv_bin unlet! b:sep unlet! b:executable call ale#assert#TearDownLinterTest() Execute(The jedi-language-server command callback should return default string): call ale#test#SetFilename('./foo.py') AssertLinter 'jedi-language-server', ale#Escape('jedi-language-server') Execute(The jedi-language-server executable should be configurable): let g:ale_python_jedils_executable = '~/.local/bin/jedi-language-server' AssertLinter '~/.local/bin/jedi-language-server' , ale#Escape('~/.local/bin/jedi-language-server') Execute(virtualenv vars should be used when ale_python_auto_virtualenv = 1): let b:ale_python_auto_virtualenv = 1 call ale#test#SetFilename('../test-files/python/with_virtualenv/subdir/foo/bar.py') let b:venv_bin = ale#path#Simplify(g:dir . '/../test-files/python/with_virtualenv/env/' . b:bin_dir) let b:sep = has('win32') ? ';' : ':' let b:executable = ale#path#Simplify(b:venv_bin . '/jedi-language-server') AssertLinter b:executable, ale#Env('PATH', b:venv_bin . b:sep . $PATH) \ . ale#Escape(b:executable) Execute(You should be able to override the jedi-language-server virtualenv lookup): call ale#test#SetFilename('../test-files/python/with_virtualenv/subdir/foo/bar.py') let g:ale_python_jedils_use_global = 1 AssertLinter 'jedi-language-server', ale#Escape('jedi-language-server') Execute(Setting executable to 'pipenv' appends 'run jedi-language-server'): let g:ale_python_jedils_executable = 'path/to/pipenv' call ale#test#SetFilename('../test-files/dummy') AssertLinter 'path/to/pipenv', ale#Escape('path/to/pipenv') . ' run jedi-language-server'