Before:
call ale#assert#SetUpLinterTest('sass', 'sasslint')
call ale#test#SetFilename('test.sass')
After:
call ale#assert#TearDownLinterTest()
Execute(The default sasslint command should be correct):
AssertLinter 'sass-lint',
\ ale#path#CdString(expand('%:p:h'))
\ . ale#Escape('sass-lint') . ' -v -q -f compact %t'