Before: runtime ale_linters/scala/scalastyle.vim After: call ale#linter#Reset() let g:ale_scala_scalastyle_options = '' let g:ale_scalastyle_conf_loc = '' Execute(Should return the correct default command): AssertEqual \ 'scalastyle %t', \ ale_linters#scala#scalastyle#GetCommand(bufnr('')) Execute(Should allow using a custom config file): let g:ale_scalastyle_config_loc = '/dooper/config.xml' AssertEqual \ 'scalastyle --config ''/dooper/config.xml'' %t', \ ale_linters#scala#scalastyle#GetCommand(bufnr('')) Execute(Should allow using custom options): let g:ale_scala_scalastyle_options = '--warnings false --quiet true' AssertEqual \ 'scalastyle --config ''/dooper/config.xml'' --warnings false --quiet true %t', \ ale_linters#scala#scalastyle#GetCommand(bufnr(''))