Improve test

Signed-off-by: Nicolás Ojeda Bär <[email protected]>

test/blackbox-tests/test-cases/no_dynlink.t

@@ -1,23 +1,22 @@
+This test checks that if a library is declared with `(no_dynlink)`, then the
+corresponding `.cmxs` file is *not* built.
+
   $ cat >dune-project <<EOF
   > (lang dune 3.17)
   > EOF
 
+First we check the behaviour when `(no_dynlink)` is not present.
+
   $ cat >dune <<EOF
   > (library
   >  (name mylib))
   > EOF
 
   $ touch a.ml
 
-  $ dune build --display short
-        ocamlc .mylib.objs/byte/mylib.{cmi,cmo,cmt}
-      ocamldep .mylib.objs/mylib__A.impl.d
-      ocamlopt .mylib.objs/native/mylib.{cmx,o}
-        ocamlc .mylib.objs/byte/mylib__A.{cmi,cmo,cmt}
-      ocamlopt .mylib.objs/native/mylib__A.{cmx,o}
-        ocamlc mylib.cma
-      ocamlopt mylib.{a,cmxa}
-      ocamlopt mylib.cmxs
+  $ dune build _build/default/mylib.cmxs
+
+Now with `(no_dynlink)`.
 
   $ cat >dune <<EOF
   > (library
@@ -27,11 +26,7 @@
 
   $ dune clean
 
-  $ dune build --display short
-        ocamlc .mylib.objs/byte/mylib.{cmi,cmo,cmt}
-      ocamldep .mylib.objs/mylib__A.impl.d
-      ocamlopt .mylib.objs/native/mylib.{cmx,o}
-        ocamlc .mylib.objs/byte/mylib__A.{cmi,cmo,cmt}
-      ocamlopt .mylib.objs/native/mylib__A.{cmx,o}
-        ocamlc mylib.cma
-      ocamlopt mylib.{a,cmxa}
+  $ dune build _build/default/mylib.cmxs
+  Error: Don't know how to build _build/default/mylib.cmxs
+  Hint: did you mean _build/default/mylib.cma or _build/default/mylib.cmxa?
+  [1]