use mocker for mocking to get rid of deep nesting

freqtrade/tests/test_persistence.py

@@ -1,22 +1,20 @@
-from unittest.mock import patch
-
 from freqtrade.exchange import Exchange
 from freqtrade.persistence import Trade
 
 
-def test_exec_sell_order():
-    with patch('freqtrade.main.exchange.sell', side_effect='mocked_order_id') as api_mock:
-        trade = Trade(
-            pair='BTC_ETH',
-            stake_amount=1.00,
-            open_rate=0.50,
-            amount=10.00,
-            exchange=Exchange.BITTREX,
-            open_order_id='mocked'
-        )
-        profit = trade.exec_sell_order(1.00, 10.00)
-        api_mock.assert_called_once_with('BTC_ETH', 1.0, 10.0)
-        assert profit == 100.0
-        assert trade.close_rate == 1.0
-        assert trade.close_profit == profit
-        assert trade.close_date is not None
+def test_exec_sell_order(mocker):
+    api_mock = mocker.patch('freqtrade.main.exchange.sell', side_effect='mocked_order_id')
+    trade = Trade(
+        pair='BTC_ETH',
+        stake_amount=1.00,
+        open_rate=0.50,
+        amount=10.00,
+        exchange=Exchange.BITTREX,
+        open_order_id='mocked'
+    )
+    profit = trade.exec_sell_order(1.00, 10.00)
+    api_mock.assert_called_once_with('BTC_ETH', 1.0, 10.0)
+    assert profit == 100.0
+    assert trade.close_rate == 1.0
+    assert trade.close_profit == profit
+    assert trade.close_date is not None