Add test to remind us to fix the UtxoEntry redb type name (#3934)

src/index.rs

@@ -6700,4 +6700,16 @@ mod tests {
     // zero
     assert_eq!(Statistic::Schema.key(), 0);
   }
+
+  #[test]
+  fn reminder_to_update_utxo_entry_type_name() {
+    // This test will break when the schema version is updated, and is a
+    // reminder to fix the type name in `impl redb::Value for &UtxoEntry`.
+    //
+    // The type name should be changed from `ord::index::utxo_entry::UtxoValue`
+    // to `ord::UtxoEntry`. I think it's probably best if we just name types
+    // `ord::NAME`, instead of including the full path, since the full path
+    // will change if we reorganize the code.
+    assert_eq!(SCHEMA_VERSION, 28);
+  }
 }