diff --git a/tests/test_sync.py b/tests/test_sync.py
new file mode 100644
index 0000000..4b18751
--- /dev/null
+++ b/tests/test_sync.py
@@ -0,0 +1,45 @@
+"""Tests for P2P sync functionality."""
+
+import os
+import tempfile
+
+import pytest
+
+from snip.db.database import Database
+from snip.sync.protocol import SyncProtocol
+
+
+@pytest.fixture
+def db():
+    with tempfile.NamedTemporaryFile(suffix=".db", delete=False) as f:
+        db_path = f.name
+    database = Database(db_path)
+    database.init_db()
+    yield database
+    os.unlink(db_path)
+
+
+@pytest.fixture
+def sync_protocol(db):
+    return SyncProtocol(db, port=18765)
+
+
+def test_sync_protocol_init(sync_protocol):
+    """Test sync protocol initialization."""
+    assert sync_protocol.port == 18765
+    assert sync_protocol.server is None
+
+
+def test_start_stop_server(sync_protocol):
+    """Test starting and stopping the sync server."""
+    sync_protocol.start_server()
+    assert sync_protocol.server is not None
+
+    sync_protocol.stop_server()
+    assert sync_protocol.server is None
+
+
+def test_sync_with_peer_no_connection(sync_protocol, db):
+    """Test sync with unreachable peer."""
+    synced = sync_protocol.sync_with_peer("127.0.0.1", 9999)
+    assert synced == 0