Before: call ale#assert#SetUpFixerTest('roc', 'roc_annotate') After: call ale#assert#TearDownFixerTest() Execute(The roc annotate callback should return the correct default values): AssertFixer { \ 'command': 'roc format annotate %t', \ 'read_temporary_file': 1, \} Execute(The roc annotate callback should allow a custom executable): let g:ale_roc_roc_annotate_executable = 'foo/bar' AssertFixer { \ 'command': 'foo/bar format annotate %t', \ 'read_temporary_file': 1, \}