Add testconfirming correct functioning

tests/persistence/test_trade_custom_data.py

@@ -2,7 +2,7 @@ import pytest
 
 from freqtrade.persistence import Trade, disable_database_use, enable_database_use
 from freqtrade.persistence.custom_data import CustomDataWrapper
-from tests.conftest import create_mock_trades_usdt
+from tests.conftest import EXMS, create_mock_trades_usdt, get_patched_freqtradebot
 
 
 @pytest.mark.usefixtures("init_persistence")
@@ -43,3 +43,41 @@ def test_trade_custom_data(fee, use_db):
     assert trade1.get_custom_data('test_dict') == {'test': 'dict'}
     assert isinstance(trade1.get_custom_data('test_dict'), dict)
     enable_database_use()
+
+
+def test_trade_custom_data_strategy_compat(mocker, default_conf_usdt, fee):
+
+    mocker.patch(f'{EXMS}.get_rate', return_value=0.50)
+    mocker.patch('freqtrade.freqtradebot.FreqtradeBot.get_real_amount', return_value=None)
+    default_conf_usdt["minimal_roi"] = {
+        "0":  100
+    }
+
+    freqtrade = get_patched_freqtradebot(mocker, default_conf_usdt)
+    create_mock_trades_usdt(fee)
+
+    trade1 = Trade.get_trades_proxy(pair='ADA/USDT')[0]
+    trade1.set_custom_data('test_str', 'test_value')
+    trade1.set_custom_data('test_int', 1)
+
+    def custom_exit(pair, trade, **kwargs):
+
+        if pair == 'ADA/USDT':
+            custom_val = trade.get_custom_data('test_str')
+            custom_val_i = trade.get_custom_data('test_int')
+
+            return f"{custom_val}_{custom_val_i}"
+
+    freqtrade.strategy.custom_exit = custom_exit
+    ff_spy = mocker.spy(freqtrade.strategy, 'custom_exit')
+    trades = Trade.get_open_trades()
+    freqtrade.exit_positions(trades)
+    Trade.commit()
+
+    trade_after = Trade.get_trades_proxy(pair='ADA/USDT')[0]
+    assert trade_after.get_custom_data('test_str') == 'test_value'
+    assert trade_after.get_custom_data('test_int') == 1
+    # 2 open pairs eligible for exit
+    assert ff_spy.call_count == 2
+
+    assert trade_after.exit_reason == 'test_value_1'