Before:
call ale#assert#SetUpLinterTest('go', 'gosimple')
call ale#test#SetFilename('../go_files/testfile2.go')
After:
call ale#assert#TearDownLinterTest()
Execute(The default gosimple command should be correct):
AssertLinter 'gosimple',
\ 'cd ' . ale#Escape(expand('%:p:h')) . ' && gosimple .'