core/tests/replay.rs

@@ -106,6 +106,13 @@ fn a_recording_can_start_in_the_middle_of_a_session() {
     }
     assert_eq!(recording.tick_count(), 70);
     assert_eq!(recording.end_tick(), 120);
+
+    // Decoding derives the start tick from the stored start world. The
+    // decoded recording must end at the same tick and equal the original.
+    let (decoded, _) = Recording::from_bytes(&recording.to_bytes(&world)).unwrap();
+    assert_eq!(decoded.end_tick(), 120);
+    assert_eq!(decoded, recording);
+
     assert_eq!(recording.replay(), Ok(world));
 }