From 5e2ebbc8d995afb4f1d6f634d8907047abaf7f95 Mon Sep 17 00:00:00 2001
From: Anders Olsson <anders.e.olsson@gmail.com>
Date: Tue, 2 Jun 2026 13:14:37 +0200
Subject: [PATCH] test(domain): assert IllegalTransition Display message

---
 crates/domain/src/object.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/crates/domain/src/object.rs b/crates/domain/src/object.rs
index 41b1829..474f787 100644
--- a/crates/domain/src/object.rs
+++ b/crates/domain/src/object.rs
@@ -180,6 +180,11 @@ mod tests {
                 to: Draft
             })
         );
+        // the Display message is the user-visible surface of the error
+        assert_eq!(
+            Draft.transition_to(Public).unwrap_err().to_string(),
+            "illegal visibility transition: draft -> public"
+        );
     }
 
     #[test]