test/test_filetype_guessing.vader


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Before:
    augroup TestFiletypeGroup
        autocmd!
        autocmd BufEnter,BufRead *.x setf xfiletype
        autocmd BufEnter,BufRead *.y set filetype=yfiletype
        autocmd BufEnter,BufRead *.z setlocal filetype=zfiletype
        autocmd BufEnter,BufRead *.jsx set filetype=javascript.jsx
    augroup END

After:
  augroup TestFiletypeGroup
      autocmd!
  augroup END
  augroup! TestFiletypeGroup

Execute(ALE should guess file extensions appropriately):
  " The whole string should be used, if there's a match.
  AssertEqual '.jsx', ale#filetypes#GuessExtension('javascript.jsx')
  " The first part should be used.
  AssertEqual '.x', ale#filetypes#GuessExtension('xfiletype.yfiletype')