diff --git a/tests/test_api_sources.py b/tests/test_api_sources.py
index 38af037..9c58430 100644
--- a/tests/test_api_sources.py
+++ b/tests/test_api_sources.py
@@ -130,3 +130,44 @@ async def test_patch_404(client):
 @pytest.mark.asyncio
 async def test_delete_404(client):
     assert (await client.delete("/api/sources/99999")).status_code == 404
+
+
+# --- FC-3d: SourceRecord surfaces consecutive_failures + next_check_at ----
+
+
+@pytest.mark.asyncio
+async def test_create_response_includes_fc3d_fields(client, artist):
+    resp = await client.post("/api/sources", json={
+        "artist_id": artist.id, "platform": "patreon",
+        "url": "https://patreon.com/alice-fc3d-new",
+    })
+    assert resp.status_code == 201
+    body = await resp.get_json()
+    assert body["consecutive_failures"] == 0
+    assert body["next_check_at"] is None  # never checked yet
+
+
+@pytest.mark.asyncio
+async def test_list_derives_next_check_at_when_last_checked_set(
+    client, artist, db,
+):
+    from datetime import UTC, datetime
+
+    from backend.app.models import Source
+
+    src = Source(
+        artist_id=artist.id, platform="patreon",
+        url="https://patreon.com/alice-fc3d-checked", enabled=True,
+        consecutive_failures=0,
+        last_checked_at=datetime.now(UTC),
+    )
+    db.add(src)
+    await db.commit()
+
+    resp = await client.get("/api/sources")
+    body = await resp.get_json()
+    target = next(
+        r for r in body if r["url"] == "https://patreon.com/alice-fc3d-checked"
+    )
+    assert target["next_check_at"] is not None
+    assert "T" in target["next_check_at"]  # ISO 8601