Before:
  runtime ale_linters/go/gosimple.vim
  call ale#test#SetFilename('../go_files/testfile2.go')

After:
  call ale#linter#Reset()

Execute(The default gosimple command should be correct):
  AssertEqual 'cd ' . ale#Escape(expand('%:p:h')) . ' && '
  \ . ' gosimple .',
  \ ale_linters#go#gosimple#GetCommand(bufnr(''))