Before: call ale#test#SetDirectory('/testplugin/test/fixers') unlet! b:ale_javascript_standard_executable unlet! b:ale_javascript_standard_options After: call ale#test#RestoreDirectory() Execute(The executable path should be correct): call ale#test#SetFilename('../test-files/eslint/react-app/subdir/testfile.js') AssertEqual \ { \ 'read_temporary_file': 1, \ 'command': (has('win32') ? 'node.exe ' : '') \ . ale#Escape(ale#path#Simplify(g:dir . '/../test-files/eslint/react-app/node_modules/standard/bin/cmd.js')) \ . ' --fix --stdin < %s > %t', \ }, \ ale#fixers#standard#Fix(bufnr('')) Execute(Custom options should be supported): let b:ale_javascript_standard_use_global = 1 let b:ale_javascript_standard_options = '--foo-bar' AssertEqual \ { \ 'read_temporary_file': 1, \ 'command': ale#Escape('standard') . ' --foo-bar --fix --stdin < %s > %t', \ }, \ ale#fixers#standard#Fix(bufnr(''))