Support both position modes on OKX

tests/exchange/test_exchange.py

@@ -99,6 +99,8 @@ def test_remove_credentials(default_conf, caplog) -> None:
 def test_init_ccxt_kwargs(default_conf, mocker, caplog):
     mocker.patch('freqtrade.exchange.Exchange._load_markets', MagicMock(return_value={}))
     mocker.patch('freqtrade.exchange.Exchange.validate_stakecurrency')
+    aei_mock = mocker.patch('freqtrade.exchange.Exchange.additional_exchange_init')
+
     caplog.set_level(logging.INFO)
     conf = copy.deepcopy(default_conf)
     conf['exchange']['ccxt_async_config'] = {'aiohttp_trust_env': True, 'asyncio_loop': True}
@@ -108,6 +110,7 @@ def test_init_ccxt_kwargs(default_conf, mocker, caplog):
         caplog)
     assert ex._api_async.aiohttp_trust_env
     assert not ex._api.aiohttp_trust_env
+    assert aei_mock.call_count == 1
 
     # Reset logging and config
     caplog.clear()
@@ -4758,8 +4761,10 @@ def test__get_params(mocker, default_conf, exchange_name):
 
     if exchange_name == 'okx':
         params2['tdMode'] = 'isolated'
+        params2['posSide'] = 'net'
 
     assert exchange._get_params(
+        side="buy",
         ordertype='market',
         reduceOnly=False,
         time_in_force='gtc',
@@ -4767,6 +4772,7 @@ def test__get_params(mocker, default_conf, exchange_name):
     ) == params1
 
     assert exchange._get_params(
+        side="buy",
         ordertype='market',
         reduceOnly=False,
         time_in_force='ioc',
@@ -4774,6 +4780,7 @@ def test__get_params(mocker, default_conf, exchange_name):
     ) == params1
 
     assert exchange._get_params(
+        side="buy",
         ordertype='limit',
         reduceOnly=False,
         time_in_force='gtc',
@@ -4786,6 +4793,7 @@ def test__get_params(mocker, default_conf, exchange_name):
     exchange._params = {'test': True}
 
     assert exchange._get_params(
+        side="buy",
         ordertype='limit',
         reduceOnly=True,
         time_in_force='ioc',