Removed backtesting funding-fee code

tests/exchange/test_ftx.py

@@ -1,4 +1,3 @@
-from datetime import datetime, timedelta
 from random import randint
 from unittest.mock import MagicMock
 
@@ -192,18 +191,3 @@ def test_get_order_id(mocker, default_conf):
         }
     }
     assert exchange.get_order_id_conditional(order) == '1111'
-
-
-@pytest.mark.parametrize("pair,when", [
-    ('XRP/USDT', datetime.utcnow()),
-    ('ADA/BTC', datetime.utcnow()),
-    ('XRP/USDT', datetime.utcnow() - timedelta(hours=30)),
-])
-def test__get_funding_rate(default_conf, mocker, pair, when):
-    api_mock = MagicMock()
-    exchange = get_patched_exchange(mocker, default_conf, api_mock, id="ftx")
-    assert exchange._get_funding_rate(pair, when) is None
-
-
-def test__get_funding_fee():
-    return