Templates
---------

  $ cat > dune-project <<EOF
  > (lang dune 2.0)
  > (name foo)
  > (generate_opam_files true)
  > (package (name foo) (depends bar))
  > EOF

Test various fields in the template file. Fields coming from the
template are always put at the end. Fields generated by Dune are
sorted in a way that pleases "opam lint".

  $ cat > foo.opam.template <<EOF
  > x-foo: "blah"
  > EOF
  $ dune build @install
  $ tail -n 1 foo.opam
  x-foo: "blah"

  $ cat > foo.opam.template <<EOF
  > libraries: [ "blah" ]
  > EOF
  $ dune build @install
  $ tail -n 1 foo.opam
  libraries: [ "blah" ]

  $ cat > foo.opam.template <<EOF
  > depends: [ "overridden" ]
  > EOF
  $ dune build @install
  $ tail -n 1 foo.opam
  depends: [ "overridden" ]