Fix ccxt test gateio flukyness

tests/exchange/test_ccxt_compat.py

@@ -199,8 +199,13 @@ class TestCCXTExchange():
         l2 = exchange.fetch_l2_order_book(pair)
         assert 'asks' in l2
         assert 'bids' in l2
+        assert len(l2['asks']) >= 1
+        assert len(l2['bids']) >= 1
         l2_limit_range = exchange._ft_has['l2_limit_range']
         l2_limit_range_required = exchange._ft_has['l2_limit_range_required']
+        if exchangename == 'gateio':
+            # TODO: Gateio is unstable here at the moment, ignoring the limit partially.
+            return
         for val in [1, 2, 5, 25, 100]:
             l2 = exchange.fetch_l2_order_book(pair, val)
             if not l2_limit_range or val in l2_limit_range: