A card of one's own: one_per_person, prefilled, replaced on send; no double sends; refusals are shown

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GT37Z1Xtfd9pUuQtMTg6Yt

tests/jetstream.rs

@@ -248,3 +248,32 @@ async fn a_membership_is_invited_becomes_active_at_sign_in_and_can_be_taken_back
     let groups = memberships::on_signed_in(&state, &kari).await;
     assert!(groups.contains(&styret.to_string()));
 }
+
+#[tokio::test]
+async fn a_card_of_ones_own_is_replaced_not_added_to_even_on_a_double_click() {
+    use portal::answers::{keep_newest_own, own_records, OWNER_FIELD};
+    let Ok(url) = std::env::var("PORTAL_TEST_NATS_URL") else {
+        eprintln!("skipped: PORTAL_TEST_NATS_URL is not set");
+        return;
+    };
+    let js = async_nats::jetstream::new(async_nats::connect(&url).await.expect("connect"));
+    ensure_stream(&js).await.expect("event stream");
+    let bucket = format!("own_{}", chrono::Utc::now().timestamp_millis());
+    let schemas = std::collections::HashMap::new();
+    let now = chrono::Utc::now().timestamp_millis();
+    let card = |name: &str, by: &str| json!({"name": name, OWNER_FIELD: by});
+
+    // Kari's first card, then two sends of her second pressed at once,
+    // and Ola's card beside them.
+    store_answer(&js, &schemas, &bucket, "k1".into(), "/kontor/ansatt", "a", &card("Kari", "kari"), now, 0).await.unwrap();
+    store_answer(&js, &schemas, &bucket, "o1".into(), "/kontor/ansatt", "a", &card("Ola", "ola"), now + 1, 0).await.unwrap();
+    store_answer(&js, &schemas, &bucket, "k2".into(), "/kontor/ansatt", "a", &card("Kari N.", "kari"), now + 2, 0).await.unwrap();
+    store_answer(&js, &schemas, &bucket, "k3".into(), "/kontor/ansatt", "a", &card("Kari N.", "kari"), now + 2, 0).await.unwrap();
+    // Both racing sends settle after storing; both must keep the same one.
+    let (a, b) = tokio::join!(keep_newest_own(&js, &bucket, "open", "kari"), keep_newest_own(&js, &bucket, "open", "kari"));
+    let _ = (a, b);
+
+    let kari = own_records(&js, &bucket, "kari").await;
+    assert_eq!(kari.iter().map(|a| a.id.as_str()).collect::<Vec<_>>(), vec!["k3"], "one card, the newest");
+    assert_eq!(own_records(&js, &bucket, "ola").await.len(), 1, "nobody else's card is touched");
+}