Improve cram tests to prevent dune errors

Author: Lucccyo

plugins/dune-rules/test/test.t

@@ -171,7 +171,17 @@ Specifying a timeout causes ORTAC_QCHECK_STM_TIMEOUT to be set before running th
    (libraries ortac-runtime my_lib)
    (package my_package))
 
-  $ ortac dune wrapper my_lib.mli --package=my_package --output=named_wrapper.ml
+The following test not only generates the Dune rules for the wrapper plugin,
+but also prevents cyclic dependencies or general Dune errors.
+  $ cat > dune-project <<EOF
+  > (lang dune 3.8)
+  > (package (name my_package))
+  > EOF
+
+  $ echo '' > my_lib.mli
+
+  $ ortac dune wrapper my_lib.mli --package=my_package --output=named_wrapper.ml >> dune
+  $ cat dune
   ; This file is generated by ortac dune wrapper
   ; It contains the rules for generating a wrapper for my_lib.mli
 
@@ -207,3 +217,5 @@ Specifying a timeout causes ORTAC_QCHECK_STM_TIMEOUT to be set before running th
    (modules named_wrapper)
    (libraries ortac-runtime my_lib)
    (package my_package))
+
+  $ dune runtest