Add async background sync task management

src/tests/test_unlock_sync.py

@@ -1,4 +1,6 @@
 import time
+import asyncio
+import warnings
 from types import SimpleNamespace
 from pathlib import Path
 import sys
@@ -17,14 +19,15 @@ def test_unlock_triggers_sync(monkeypatch, tmp_path):
     pm.initialize_managers = lambda: None
     called = {"sync": False}
 
-    def fake_sync(self):
+    async def fake_sync(self):
         called["sync"] = True
 
-    monkeypatch.setattr(PasswordManager, "sync_index_from_nostr", fake_sync)
+    monkeypatch.setattr(PasswordManager, "sync_index_from_nostr_async", fake_sync)
 
     pm.unlock_vault("pw")
     pm.start_background_sync()
     time.sleep(0.05)
+    pm.cleanup()
 
     assert called["sync"]
 
@@ -54,3 +57,29 @@ def test_quick_unlock_background_sync(monkeypatch, tmp_path):
     pm.exit_managed_account()
 
     assert called["bg"]
+
+
+def test_start_background_sync_running_loop(monkeypatch):
+    pm = PasswordManager.__new__(PasswordManager)
+    pm.offline_mode = False
+    called = {"init": False, "sync": False}
+
+    async def fake_attempt(self):
+        called["init"] = True
+
+    async def fake_sync(self):
+        called["sync"] = True
+
+    monkeypatch.setattr(PasswordManager, "attempt_initial_sync_async", fake_attempt)
+    monkeypatch.setattr(PasswordManager, "sync_index_from_nostr_async", fake_sync)
+
+    async def runner():
+        with warnings.catch_warnings(record=True) as w:
+            warnings.simplefilter("always")
+            pm.start_background_sync()
+            await asyncio.sleep(0.01)
+        assert not any(issubclass(wi.category, RuntimeWarning) for wi in w)
+
+    asyncio.run(runner())
+    pm.cleanup()
+    assert called["init"] and called["sync"]