Test both ways of specifying multiple allowed deletion directories

tests/rm_files.rs

@@ -175,10 +175,12 @@ fn rm_is_restricted(#[case] server: TestServer) -> anyhow::Result<()> {
 
 /// This test runs the server with --allowed-rm-dir argument and checks that
 /// deletions of the specified directories themselves are allowed.
+///
+/// Both ways of specifying multiple directories are tested.
 #[rstest]
-fn can_rm_allowed_dir(
-    #[with(&["-R", "dira", "-R", "dirb", "-R", "dirc"])] server: TestServer,
-) -> anyhow::Result<()> {
+#[case(server(&["-R", "dira,dirb,dirc"]))]
+#[case(server(&["-R", "dira", "-R", "dirb", "-R", "dirc"]))]
+fn can_rm_allowed_dir(#[case] server: TestServer) -> anyhow::Result<()> {
     assert_rm_ok(server.url(), DIRECTORIES)
 }