Add tests for basic modal modules.

Signed-off-by: Thomas Del Vecchio <[email protected]>

test/passing/dune.inc

@@ -9031,6 +9031,42 @@
  (package ocamlformat)
  (action (diff tests/module_item_spacing.mli.js-err module_item_spacing.mli.js-stderr)))
 
+(rule
+ (deps tests/.ocamlformat )
+ (package ocamlformat)
+ (action
+  (with-stdout-to module_modes.mli.stdout
+   (with-stderr-to module_modes.mli.stderr
+     (run %{bin:ocamlformat} --margin-check %{dep:tests/module_modes.mli})))))
+
+(rule
+ (alias runtest)
+ (package ocamlformat)
+ (action (diff tests/module_modes.mli.ref module_modes.mli.stdout)))
+
+(rule
+ (alias runtest)
+ (package ocamlformat)
+ (action (diff tests/module_modes.mli.err module_modes.mli.stderr)))
+
+(rule
+ (deps tests/.ocamlformat )
+ (package ocamlformat)
+ (action
+  (with-stdout-to module_modes.mli.js-stdout
+   (with-stderr-to module_modes.mli.js-stderr
+     (run %{bin:ocamlformat} --profile=janestreet --enable-outside-detected-project --disable-conf-files %{dep:tests/module_modes.mli})))))
+
+(rule
+ (alias runtest)
+ (package ocamlformat)
+ (action (diff tests/module_modes.mli.js-ref module_modes.mli.js-stdout)))
+
+(rule
+ (alias runtest)
+ (package ocamlformat)
+ (action (diff tests/module_modes.mli.js-err module_modes.mli.js-stderr)))
+
 (rule
  (deps tests/.ocamlformat )
  (package ocamlformat)

test/passing/tests/module_modes.mli

@@ -0,0 +1,21 @@
+@@ portable
+
+type t
+
+val portable : t
+val nonportable : t @@ nonportable
+
+module T : sig
+  val portable : t
+  val portable : t @@ nonportable
+end
+
+module T : sig @@ nonportable
+  val portable : t
+  val portable : t @@ nonportable
+end
+
+module (T @ nonportable) : sig @@ portable
+  val portable : t
+  val nonportable : t @@ nonportable
+end