Before: call ale#assert#SetUpLinterTest('python', 'pylint') let b:bin_dir = has('win32') ? 'Scripts' : 'bin' let b:command_tail = ' --output-format text --msg-template="{path}:{line}:{column}: {msg_id} ({symbol}) {msg}" --reports n %s' After: unlet! b:bin_dir unlet! b:executable unlet! b:command_tail call ale#assert#TearDownLinterTest() Execute(The pylint callbacks should return the correct default values): AssertLinter 'pylint', \ ale#path#BufferCdString(bufnr('')) \ . ale#Escape('pylint') . ' ' . b:command_tail Execute(The option for disabling changing directories should work): let g:ale_python_pylint_change_directory = 0 AssertLinter 'pylint', ale#Escape('pylint') . ' ' . b:command_tail Execute(The pylint executable should be configurable, and escaped properly): let g:ale_python_pylint_executable = 'executable with spaces' AssertLinter 'executable with spaces', \ ale#path#BufferCdString(bufnr('')) \ . ale#Escape('executable with spaces') . ' ' . b:command_tail Execute(The pylint command callback should let you set options): let g:ale_python_pylint_options = '--some-option' AssertLinter 'pylint', \ ale#path#BufferCdString(bufnr('')) \ . ale#Escape('pylint') . ' --some-option' . b:command_tail Execute(The pylint callbacks shouldn't detect virtualenv directories where they don't exist): silent execute 'file ' . fnameescape(g:dir . '/python_paths/no_virtualenv/subdir/foo/bar.py') AssertLinter 'pylint', \ ale#path#CdString(ale#path#Simplify(g:dir . '/python_paths/no_virtualenv/subdir')) \ . ale#Escape('pylint') . ' ' . b:command_tail Execute(The pylint callbacks should detect virtualenv directories): silent execute 'file ' . fnameescape(g:dir . '/python_paths/with_virtualenv/subdir/foo/bar.py') let b:executable = ale#path#Simplify( \ g:dir . '/python_paths/with_virtualenv/env/' . b:bin_dir . '/pylint' \) AssertLinter b:executable, \ ale#path#CdString(ale#path#Simplify(g:dir . '/python_paths/with_virtualenv/subdir')) \ . ale#Escape(b:executable) . ' ' . b:command_tail Execute(You should able able to use the global pylint instead): silent execute 'file ' . fnameescape(g:dir . '/python_paths/with_virtualenv/subdir/foo/bar.py') let g:ale_python_pylint_use_global = 1 AssertLinter 'pylint', \ ale#path#CdString(ale#path#Simplify(g:dir . '/python_paths/with_virtualenv/subdir')) \ . ale#Escape('pylint') . ' ' . b:command_tail Execute(Setting executable to 'pipenv' appends 'run pylint'): let g:ale_python_pylint_executable = 'path/to/pipenv' AssertLinter 'path/to/pipenv', \ ale#path#BufferCdString(bufnr('')) \ . ale#Escape('path/to/pipenv') . ' run pylint' \ . ' --output-format text --msg-template="{path}:{line}:{column}: {msg_id} ({symbol}) {msg}" --reports n %s' Execute(Pipenv is detected when python_pylint_auto_pipenv is set): let g:ale_python_pylint_auto_pipenv = 1 call ale#test#SetFilename('/testplugin/test/python_fixtures/pipenv/whatever.py') AssertLinter 'pipenv', \ ale#path#BufferCdString(bufnr('')) \ . ale#Escape('pipenv') . ' run pylint' \ . ' --output-format text --msg-template="{path}:{line}:{column}: {msg_id} ({symbol}) {msg}" --reports n %s'