unikernel/duniverse/dune_/test/blackbox-tests/test-cases/check-alias/ocamldep-cycles.t

@@ -0,0 +1,37 @@
+The @check alias should detect dependency cycles
+
+  $ cat >dune-project <<EOF
+  > (lang dune 3.2)
+  > EOF
+
+  $ cat >dune <<EOF
+  > (library (name foo))
+  > EOF
+
+  $ cat >a.ml <<EOF
+  > module B = B
+  > EOF
+
+  $ touch b.ml b.mli a.mli
+
+  $ dune build @all
+
+  $ cat >b.ml <<EOF
+  > module A = A
+  > EOF
+
+  $ dune build @check
+  Error: dependency cycle between modules in _build/default:
+     B
+  -> A
+  -> B
+  -> required by alias check
+  [1]
+  $ dune build @all
+  Error: dependency cycle between modules in _build/default:
+     B
+  -> A
+  -> B
+  -> required by _build/default/foo.cma
+  -> required by alias all
+  [1]