Before: call ale#assert#SetUpLinterTest('hurl', 'hurlfmt') call ale#test#SetFilename('dummy.hurl') let g:ale_ruby_hurlfmt_executable = 'hurlfmt' let g:ale_ruby_hurlfmt_options = '' After: call ale#assert#TearDownLinterTest() Execute(Executable should default to hurlfmt): AssertLinter 'hurlfmt', ale#Escape('hurlfmt') \ . ' --check --no-color ' Execute(Should be able to set a custom executable): let g:ale_hurl_hurlfmt_executable = 'bin/hurlfmt' AssertLinter 'bin/hurlfmt' , ale#Escape('bin/hurlfmt') \ . ' --check --no-color '