Before: call ale#assert#SetUpLinterTest('elixir', 'credo') call ale#test#SetFilename('elixir_paths/mix_project/lib/app.ex') After: unlet! g:ale_elixir_credo_strict call ale#assert#TearDownLinterTest() Execute(Builds credo command with --strict mode when set to 1): let g:ale_elixir_credo_strict = 1 AssertLinter 'mix', \ ale#path#CdString(ale#path#Simplify(g:dir . '/elixir_paths/mix_project')) \ . 'mix help credo && mix credo --strict --format=flycheck --read-from-stdin %s' Execute(Builds credo command with suggest mode by default): AssertLinter 'mix', \ ale#path#CdString(ale#path#Simplify(g:dir . '/elixir_paths/mix_project')) \ . 'mix help credo && mix credo suggest --format=flycheck --read-from-stdin %s' Execute(Builds credo command with suggest mode when set to 0): let g:ale_elixir_credo_strict = 0 AssertLinter 'mix', \ ale#path#CdString(ale#path#Simplify(g:dir . '/elixir_paths/mix_project')) \ . 'mix help credo && mix credo suggest --format=flycheck --read-from-stdin %s'