test(trend): cover binance oneway empty order params for DCA

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_trend_market_add_params.py

@@ -23,6 +23,19 @@ class TestTrendMarketAddParams(unittest.TestCase):
         self.assertEqual(args[0][5], {})
         self.assertIsNotNone(args[0][5])
 
+    def test_binance_oneway_empty_params_not_passed_as_none(self):
+        ex = MagicMock()
+        ex.create_order.return_value = {"id": "1"}
+        app = MagicMock(spec=["exchange", "ensure_markets_loaded", "build_binance_order_params"])
+        app.exchange = ex
+        app.ensure_markets_loaded = MagicMock()
+        app.build_binance_order_params = MagicMock(return_value={})
+        cfg = {"app_module": app}
+
+        trend_market_add(cfg, "BTC/USDT:USDT", "long", 1, 10)
+
+        self.assertEqual(ex.create_order.call_args[0][5], {})
+
 
 if __name__ == "__main__":
     unittest.main()