Reset logging mixin to avoid random test failure

freqtrade/exchange/common.py

@@ -12,6 +12,14 @@ logger = logging.getLogger(__name__)
 __logging_mixin = None
 
 
+def _reset_logging_mixin():
+    """
+    Reset global logging mixin - used in tests only.
+    """
+    global __logging_mixin
+    __logging_mixin = LoggingMixin(logger)
+
+
 def _get_logging_mixin():
     # Logging-mixin to cache kucoin responses
     # Only to be used in retrier

tests/exchange/test_exchange.py

@@ -2155,6 +2155,8 @@ async def test__async_get_candle_history(default_conf, mocker, caplog, exchange_
 
 @pytest.mark.asyncio
 async def test__async_kucoin_get_candle_history(default_conf, mocker, caplog):
+    from freqtrade.exchange.common import _reset_logging_mixin
+    _reset_logging_mixin()
     caplog.set_level(logging.INFO)
     api_mock = MagicMock()
     api_mock.fetch_ohlcv = MagicMock(side_effect=ccxt.DDoSProtection(