unikernel/duniverse/dune_/test/blackbox-tests/test-cases/executables-implicit-empty-intf.t/run.t

@@ -0,0 +1,48 @@
+Executables with no corresponding `.mli` file will have one generated for them
+by Dune:
+
+  $ cat >dune-project <<EOF
+  > (lang dune 2.9)
+  > (executables_implicit_empty_intf true)
+  > EOF
+
+We rewrite the warning to ensure tests behave the same on 4.11 and 4.12
+  $ dune build ./bin/executable.exe 2>&1 |
+  > sed -e 's,(warn.*32.*),(warning 32),g'
+  File "bin/executable.ml", line 1, characters 4-10:
+  1 | let unused = Dependency.a
+          ^^^^^^
+  Error (warning 32): unused value unused.
+
+  $ test ! -f _build/default/bin/dependency.mli
+  $ cat _build/default/bin/executable.mli
+  (* Auto-generated by Dune *)
+
+as will test binaries:
+
+  $ dune runtest 2>&1 |
+  > sed -e 's,(warn.*32.*),(warning 32),g'
+  File "test/test.ml", line 1, characters 4-10:
+  1 | let unused = 1
+          ^^^^^^
+  Error (warning 32): unused value unused.
+
+  $ cat _build/default/test/test.mli
+  (* Auto-generated by Dune *)
+
+If an executable already has an interface, it is preserved:
+
+  $ dune clean
+  $ dune build ./bin_with_intf/executable.exe
+  $ cat _build/default/bin_with_intf/executable.mli
+  val a : int
+
+Generation of empty `.mli` files is disabled by default prior to lang 3.0:
+
+  $ dune clean
+  $ echo >dune-project "(lang dune 2.9)"
+  $ dune build ./bin/executable.exe
+  $ dune runtest
+  $ test ! -f _build/default/bin/executable.mli
+  $ test ! -f _build/default/test/test.mli
+