diff --git a/api/tests/test_app.py b/api/tests/test_app.py
index 601ddff..6dc057b 100644
--- a/api/tests/test_app.py
+++ b/api/tests/test_app.py
@@ -93,3 +93,67 @@ async def test_healthcheck_nats_follows_connection_state(
 
 def test_router_prefix():
     assert router.prefix == "/api/v1"
+
+
+class _FakeNats:
+    def __init__(self) -> None:
+        self.closed = False
+
+    async def close(self) -> None:
+        self.closed = True
+
+
+class _FakeS3Client:
+    def __init__(self) -> None:
+        self.session_closed = False
+
+    async def close_session(self) -> None:
+        self.session_closed = True
+
+
+@pytest.fixture
+def _no_smb(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setattr(app_module.smbclient, "register_session", lambda *args, **kwargs: None)
+    monkeypatch.setattr(app_module.smbclient, "reset_connection_cache", lambda: None)
+
+
+@pytest.mark.usefixtures("_no_smb")
+async def test_lifespan_starts_when_s3_and_nats_unavailable(monkeypatch: pytest.MonkeyPatch):
+    async def unavailable() -> None:
+        return None
+
+    monkeypatch.setattr(app_module, "_connect_s3", unavailable)
+    monkeypatch.setattr(app_module, "_connect_nats", unavailable)
+    reached_yield = False
+
+    async with app_module.lifespan(app_module.app):
+        reached_yield = True
+        assert app_module.app.state.storage is None
+        assert app_module.app.state.nats is None
+
+    assert reached_yield
+
+
+@pytest.mark.usefixtures("_no_smb")
+async def test_lifespan_closes_created_resources(monkeypatch: pytest.MonkeyPatch):
+    fake_nats = _FakeNats()
+    s3_client = _FakeS3Client()
+    storage = SimpleNamespace(client=s3_client)
+
+    async def connect_s3() -> SimpleNamespace:
+        return storage
+
+    async def connect_nats() -> _FakeNats:
+        return fake_nats
+
+    monkeypatch.setattr(app_module, "_connect_s3", connect_s3)
+    monkeypatch.setattr(app_module, "_connect_nats", connect_nats)
+
+    async with app_module.lifespan(app_module.app):
+        assert app_module.app.state.storage is storage
+        assert app_module.app.state.nats is fake_nats
+        assert not fake_nats.closed
+        assert not s3_client.session_closed
+
+    assert fake_nats.closed
+    assert s3_client.session_closed