Before: Save &filetype Save g:ale_ocaml_ols_executable Save g:ale_ocaml_ols_use_global let &filetype = 'ocaml' unlet! g:ale_ocaml_ols_executable unlet! g:ale_ocaml_ols_use_global runtime ale_linters/ocaml/ols.vim call ale#test#SetDirectory('/testplugin/test/command_callback') After: Restore call ale#test#RestoreDirectory() call ale#linter#Reset() Execute(The language string should be correct): AssertEqual 'ocaml', ale#handlers#ols#GetLanguage(bufnr('')) Execute(The default executable should be correct): AssertEqual 'ocaml-language-server', ale#handlers#ols#GetExecutable(bufnr('')) AssertEqual \ ale#Escape('ocaml-language-server') . ' --stdio', \ ale#handlers#ols#GetCommand(bufnr('')) Execute(The project root should be detected correctly): AssertEqual '', ale#handlers#ols#GetProjectRoot(bufnr('')) call ale#test#SetFilename('ols_paths/file.ml') AssertEqual \ ale#path#Winify(g:dir . '/ols_paths'), \ ale#handlers#ols#GetProjectRoot(bufnr('')) Execute(The local executable should be used when available): call ale#test#SetFilename('ols_paths/file.ml') AssertEqual \ ale#path#Winify(g:dir . '/ols_paths/node_modules/.bin/ocaml-language-server'), \ ale#handlers#ols#GetExecutable(bufnr('')) Execute(The gloabl executable should always be used when use_global is set): let g:ale_ocaml_ols_use_global = 1 call ale#test#SetFilename('ols_paths/file.ml') AssertEqual 'ocaml-language-server', ale#handlers#ols#GetExecutable(bufnr('')) Execute(The executable should be configurable): let g:ale_ocaml_ols_executable = 'foobar' AssertEqual 'foobar', ale#handlers#ols#GetExecutable(bufnr(''))