Added backtesting methods back in

tests/exchange/test_exchange.py

@@ -3280,3 +3280,15 @@ def test_get_max_leverage(default_conf, mocker, pair, nominal_value, max_lev):
     # Binance has a different method of getting the max leverage
     exchange = get_patched_exchange(mocker, default_conf, id="kraken")
     assert exchange.get_max_leverage(pair, nominal_value) == max_lev
+
+
+def test_get_mark_price():
+    return
+
+
+def test_get_funding_fee_dates():
+    return
+
+
+def test_calculate_funding_fees():
+    return