Add test for infix operators
Add test for infix operators

avh4/elm-format,nukisman/elm-format-short,nukisman/elm-format-short,avh4/elm-format,fredcy/elm-format,fredcy/elm-format,nukisman/elm-format-short,nukisman/elm-format-short,fredcy/elm-format,avh4/elm-format,avh4/elm-format,nukisman/elm-format-short