Before: Save g:ale_php_cs_fixer_executable let g:ale_php_cs_fixer_executable = 'php-cs-fixer' call ale#test#SetDirectory('/testplugin/test/fixers') silent cd .. silent cd command_callback let g:dir = getcwd() After: Restore call ale#test#RestoreDirectory() Execute(project with php-cs-fixer should use local by default): call ale#test#SetFilename('php_paths/project-with-php-cs-fixer/test.php') AssertEqual \ ale#path#Simplify(g:dir . '/php_paths/project-with-php-cs-fixer/vendor/bin/php-cs-fixer'), \ ale#fixers#php_cs_fixer#GetExecutable(bufnr('')) Execute(use-global should override local detection): let g:ale_php_cs_fixer_use_global = 1 call ale#test#SetFilename('php_paths/project-with-php-cs-fixer/test.php') AssertEqual \ 'php-cs-fixer', \ ale#fixers#php_cs_fixer#GetExecutable(bufnr('')) Execute(project without php-cs-fixer should use global): call ale#test#SetFilename('php_paths/project-without-php-cs-fixer/test.php') AssertEqual \ 'php-cs-fixer', \ ale#fixers#php_cs_fixer#GetExecutable(bufnr('')) Execute(The php-cs-fixer callback should return the correct default values): call ale#test#SetFilename('php_paths/project-without-php-cs-fixer/foo/test.php') AssertEqual \ {'read_temporary_file': 1, 'command': ale#Escape('php-cs-fixer') . ' fix %t' }, \ ale#fixers#php_cs_fixer#Fix(bufnr(''))