fix sequential tests run

conftest.py

@@ -7,6 +7,8 @@ from typing import Any, Tuple
 
 import pytest
 
+import jmclient  # install asyncioreactor
+
 
 def get_bitcoind_version(bitcoind_path: str, conf: str) -> Tuple[int, int]:
     """

test/unified/test_e2e_coinjoin.py

@@ -178,6 +178,7 @@ class TWalletRPCManager(object):
 class E2ETCoinjoinTests(TrialTestCase):
 
     def setUp(self):
+        asyncio.set_event_loop(reactor._asyncioEventloop)
         # For quicker testing, restrict the range of timelock
         # addresses to avoid slow load of multiple bots.
         self._orig_TIMELOCK_ERA_YEARS = \