feat: worker relays outbox to nats

crates/adapters/nats/src/tests/consumer.rs

@@ -0,0 +1,46 @@
+use super::*;
+use domain::value_objects::UserId;
+use event_payload::{EventMessage, EventPayload};
+use uuid::Uuid;
+
+fn payload() -> EventPayload {
+    EventPayload::from(&DomainEvent::UserUpdated {
+        user_id: UserId::from_uuid(Uuid::new_v4()),
+    })
+}
+
+fn encode(event_id: Option<&str>) -> Vec<u8> {
+    serde_json::to_vec(&EventMessage {
+        event_id: event_id.map(str::to_owned),
+        payload: payload(),
+    })
+    .unwrap()
+}
+
+#[test]
+fn decode_message_reads_the_event_id() {
+    let id = Uuid::new_v4();
+    let (decoded, event) = decode_message(&encode(Some(&id.to_string()))).unwrap();
+    assert_eq!(decoded.unwrap().value(), id);
+    assert!(matches!(event, DomainEvent::UserUpdated { .. }));
+}
+
+#[test]
+fn decode_message_accepts_a_legacy_payload_without_an_id() {
+    let legacy = serde_json::to_vec(&payload()).unwrap();
+    let (decoded, _) = decode_message(&legacy).unwrap();
+    assert!(decoded.is_none());
+    let (decoded, _) = decode_message(&encode(None)).unwrap();
+    assert!(decoded.is_none());
+}
+
+#[test]
+fn decode_message_rejects_a_malformed_id() {
+    let err = decode_message(&encode(Some("not-a-uuid"))).unwrap_err();
+    assert!(err.to_string().contains("event_id"), "{err}");
+}
+
+#[test]
+fn decode_message_rejects_garbage() {
+    assert!(decode_message(b"{not json").is_err());
+}