Add tests for new scenario

tests/conftest.py

@@ -608,6 +608,14 @@ def limit_buy_order_old_partial():
     }
 
 
+@pytest.fixture
+def limit_buy_order_old_partial_canceled(limit_buy_order_old_partial):
+    res = deepcopy(limit_buy_order_old_partial)
+    res['status'] = 'canceled'
+    res['fee'] = {'cost': 0.0001, 'currency': 'ETH'}
+    return res
+
+
 @pytest.fixture
 def limit_sell_order():
     return {

tests/test_freqtradebot.py

@@ -2076,6 +2076,42 @@ def test_check_handle_timedout_partial(default_conf, ticker, limit_buy_order_old
     assert trades[0].stake_amount == open_trade.open_rate * trades[0].amount
 
 
+def test_check_handle_timedout_partial_fee(default_conf, ticker, open_trade, caplog,
+                                           limit_buy_order_old_partial, trades_for_order,
+                                           limit_buy_order_old_partial_canceled, mocker) -> None:
+    rpc_mock = patch_RPCManager(mocker)
+    cancel_order_mock = MagicMock(return_value=limit_buy_order_old_partial_canceled)
+    patch_exchange(mocker)
+    mocker.patch.multiple(
+        'freqtrade.exchange.Exchange',
+        get_ticker=ticker,
+        get_order=MagicMock(return_value=limit_buy_order_old_partial),
+        cancel_order=cancel_order_mock,
+        get_trades_for_order=MagicMock(return_value=trades_for_order),
+    )
+    freqtrade = FreqtradeBot(default_conf)
+
+    assert open_trade.amount == limit_buy_order_old_partial['amount']
+
+    open_trade.fee_open = 0.0025
+    open_trade.fee_close = 0.0025
+    Trade.session.add(open_trade)
+    # cancelling a half-filled order should update the amount to the bought amount
+    # and apply fees if necessary.
+    freqtrade.check_handle_timedout()
+
+    assert log_has_re(r"Applying fee on amount for Trade.* Order", caplog)
+
+    assert cancel_order_mock.call_count == 1
+    assert rpc_mock.call_count == 1
+    trades = Trade.query.filter(Trade.open_order_id.is_(open_trade.open_order_id)).all()
+    assert len(trades) == 1
+    # Verify that tradehas been updated
+    assert trades[0].amount == limit_buy_order_old_partial['amount'] - 0.0001
+    assert trades[0].open_order_id is None
+    assert trades[0].fee_open == 0
+
+
 def test_check_handle_timedout_exception(default_conf, ticker, open_trade, mocker, caplog) -> None:
     patch_RPCManager(mocker)
     patch_exchange(mocker)