pkg: add an end-2-end test for ocamlformat dev-tool

Signed-off-by: Alpha DIALLO <[email protected]>

test/blackbox-tests/test-cases/pkg/ocamlformat-dev-tool.t

@@ -0,0 +1,135 @@
+Exercises end to end, locking and building ocamlformat dev tool.
+
+  $ . ./helpers.sh
+  $ mkrepo
+
+Make a library:
+  $ mkdir ocamlformat
+  $ cd ocamlformat
+  $ cat > dune-project <<EOF
+  > (lang dune 3.13)
+  > (package (name ocamlformat))
+  > EOF
+
+  $ cat > ocamlformat.ml <<EOF
+  > let () = print_endline "formatted"
+  > EOF
+
+  $ cat > dune <<EOF
+  > (executable
+  >  (public_name ocamlformat))
+  > EOF
+
+  $ cd ..
+  $ tar -czf ocamlformat.tar.gz ocamlformat
+  $ rm -rf ocamlformat
+
+Start a oneshot webserver so dune can download the packgae with http:
+  $ webserver_oneshot --content-file ocamlformat.tar.gz --port-file port.txt &
+  $ until test -f port.txt; do sleep 0.1; done
+  $ PORT=$(cat port.txt)
+
+Make a package for the library:
+  $ mkpkg ocamlformat 0.26.2 <<EOF
+  > build: [
+  >   ["dune" "subst"] {dev}
+  >   [
+  >     "dune"
+  >     "build"
+  >     "-p"
+  >     name
+  >     "-j"
+  >     jobs
+  >     "@install"
+  >     "@runtest" {with-test}
+  >     "@doc" {with-doc}
+  >   ]
+  > ]
+  > url {
+  >  src: "http://0.0.0.0:$PORT"
+  >  checksum: [
+  >   "md5=$(md5sum ocamlformat.tar.gz | cut -f1 -d' ')"
+  >  ]
+  > }
+  > EOF
+
+Make a project that uses the library:
+
+  $ cat > dune-project <<EOF
+  > (lang dune 3.13)
+  > (package
+  >  (name foo))
+  > EOF
+
+  $ cat > foo.ml <<EOF
+  > let () = print_endline "Hello, world"
+  > EOF
+
+  $ cat > dune <<EOF
+  > (executable
+  >  (public_name foo))
+  > EOF
+
+  $ cat > .ocamlformat <<EOF
+  > profile = default
+  > version = 0.26.2
+  > EOF
+
+  $ cat >dune-workspace <<EOF
+  > (lang dune 3.13)
+  > (lock_dir
+  >  (path "dune.lock/dev_tools.lock/ocamlformat_dev")
+  >  (repositories mock))
+  > (lock_dir
+  >  (repositories mock))
+  > (repository
+  >  (name mock)
+  >  (source "file://$(pwd)/mock-opam-repository"))
+  > EOF
+
+Lock, build, and run the `dune fmt` command in the project:
+
+We lock the to trigger package management 
+  $ dune pkg lock
+  Solution for dune.lock:
+  (no dependencies to lock)
+
+We format the foo.ml
+  $ dune fmt
+  Solution for dune.lock/dev_tools.lock/ocamlformat_dev:
+  - ocamlformat.0.26.2
+  Error: unknown checksum md5=0f438cf036709326e9e0d82ea9eaf2ec
+  -> required by _build/_private/default/.ocamlformat/ocamlformat/source
+  -> required by _build/_private/default/.ocamlformat/ocamlformat/target/cookie
+  -> required by _build/default/.formatted/foo.ml
+  -> required by alias .formatted/fmt
+  -> required by alias fmt
+  [1]
+  $ cat foo.ml
+  let () = print_endline "Hello, world"
+
+We format again, ocamlformat is a dependency now
+  $ cat > dune-project <<EOF
+  > (lang dune 3.13)
+  > (package
+  >  (name foo)
+  > (depends ocamlformat))
+  > EOF
+  $ cat > foo.ml <<EOF
+  > let () = print_endline "Hello, world"
+  > EOF
+
+We lock the to trigger package management 
+  $ dune pkg lock
+  Solution for dune.lock:
+  - ocamlformat.0.26.2
+
+We format the foo.ml
+  $ dune fmt
+  File "foo.ml", line 1, characters 0-0:
+  Error: Files _build/default/foo.ml and _build/default/.formatted/foo.ml
+  differ.
+  Promoting _build/default/.formatted/foo.ml to foo.ml.
+  [1]
+  $ cat foo.ml
+  formatted