unikernel/duniverse/dune_/test/blackbox-tests/test-cases/buildable-empty-intf-if-absent.t

@@ -0,0 +1,70 @@
+Generate empty interfaces when using (empty_module_interface_if_absent)
+
+  $ cat >dune-project <<EOF
+  > (lang dune 3.0)
+  > EOF
+
+Executables
+
+  $ cat >main.ml <<EOF
+  > module D = Dep
+  > EOF
+
+  $ touch dep.ml
+
+  $ cat >dune <<EOF
+  > (executable (name main) (empty_module_interface_if_absent))
+  > EOF
+
+  $ dune build ./main.exe
+
+  $ cat _build/default/dep.mli
+  (* Auto-generated by Dune *)
+
+Libraries
+
+  $ cat >dune <<EOF
+  > (library (name l) (modules a b) (empty_module_interface_if_absent))
+  > EOF
+
+  $ touch a.ml b.ml
+
+  $ dune build
+
+  $ cat _build/default/a.mli
+  (* Auto-generated by Dune *)
+  $ cat _build/default/b.mli
+  (* Auto-generated by Dune *)
+
+Version check
+
+  $ cat >dune-project <<EOF
+  > (lang dune 2.9)
+  > EOF
+
+  $ dune build
+  File "dune", line 1, characters 32-66:
+  1 | (library (name l) (modules a b) (empty_module_interface_if_absent))
+                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  Error: 'empty_module_interface_if_absent' is only available since version 3.0
+  of the dune language. Please update your dune-project file to have (lang dune
+  3.0).
+  [1]
+
+Check that interfaces are *not* generated if field is not used
+
+  $ cat >dune <<EOF
+  > (lang dune 3.0)
+  > EOF
+
+  $ cat >dune <<EOF
+  > (library (name l) (modules a b))
+  > EOF
+
+  $ touch a.mli
+
+  $ dune build
+
+  $ test -f _build/default/a.mli
+
+  $ test ! -f _build/default/b.mli