add missing import

freqtrade/tests/test_analyze.py

@@ -1,5 +1,6 @@
 # pragma pylint: disable=missing-docstring,W0621
 import json
+
 import arrow
 import pytest
 from pandas import DataFrame

freqtrade/tests/test_exchange.py

@@ -3,8 +3,8 @@ from unittest.mock import MagicMock
 
 import pytest
 
+from freqtrade import OperationalException
 from freqtrade.exchange import validate_pairs
-from freqtrade.misc import OperationalException
 
 
 def test_validate_pairs(default_conf, mocker):

freqtrade/tests/test_main.py

@@ -7,8 +7,8 @@ import requests
 from sqlalchemy import create_engine
 
 from freqtrade import DependencyException, OperationalException
-from freqtrade.exchange import Exchanges
 from freqtrade.analyze import SignalType
+from freqtrade.exchange import Exchanges
 from freqtrade.main import create_trade, handle_trade, init, \
     get_target_bid, _process
 from freqtrade.misc import get_state, State

freqtrade/tests/test_rpc.py

@@ -1,7 +1,6 @@
 # pragma pylint: disable=missing-docstring, too-many-arguments, too-many-ancestors, C0103
-from unittest.mock import MagicMock
-
 from copy import deepcopy
+from unittest.mock import MagicMock
 
 from freqtrade.rpc import init, cleanup, send_msg