Before: Save g:ale_stylelint_options let g:ale_stylelint_options = '' call ale#assert#SetUpFixerTest('css', 'stylelint') After: call ale#assert#TearDownFixerTest() Execute(The stylelint callback should return the correct default values): call ale#test#SetFilename('../eslint-test-files/react-app/subdir/testfile.css') AssertFixer \ { \ 'read_temporary_file': 1, \ 'command': ale#path#BufferCdString(bufnr('')) \ . (has('win32') ? 'node.exe ' : '') \ . ale#Escape(ale#path#Simplify(g:dir . '/../eslint-test-files/react-app/node_modules/stylelint/bin/stylelint.js')) \ . ' %t' \ . ' --fix', \ } Execute(The stylelint callback should include custom stylelint options): let g:ale_stylelint_options = '--cache' call ale#test#SetFilename('../eslint-test-files/react-app/subdir/testfile.css') AssertFixer \ { \ 'read_temporary_file': 1, \ 'command': ale#path#BufferCdString(bufnr('')) \ . (has('win32') ? 'node.exe ' : '') \ . ale#Escape(ale#path#Simplify(g:dir . '/../eslint-test-files/react-app/node_modules/stylelint/bin/stylelint.js')) \ . ' %t' \ . ' --cache' \ . ' --fix', \ }