Before: call ale#assert#SetUpLinterTest('zeek', 'zeek') let b:command_tail = ' --parse-only %s' After: call ale#assert#TearDownLinterTest() unlet! b:command_tail Execute(The default command should be correct): AssertLinter 'zeek', ale#Escape('zeek') . b:command_tail Execute(The zeek executable should be configurable, and escaped properly): let g:ale_zeek_zeek_executable = 'executable with spaces' AssertLinter 'executable with spaces', ale#Escape('executable with spaces') . b:command_tail