diff --git a/src/wormhole/test/dilate/test_manager.py b/src/wormhole/test/dilate/test_manager.py
index 6acf25b..690e1cf 100644
--- a/src/wormhole/test/dilate/test_manager.py
+++ b/src/wormhole/test/dilate/test_manager.py
@@ -20,7 +20,8 @@ def make_dilator():
     eq = EventualQueue(clock)
     term = mock.Mock(side_effect=lambda: True)  # one write per Eventual tick
 
-    def term_factory(): return term
+    def term_factory():
+        return term
     coop = Cooperator(terminationPredicateFactory=term_factory,
                       scheduler=eq.eventually)
     send = mock.Mock()
diff --git a/src/wormhole/test/dilate/test_outbound.py b/src/wormhole/test/dilate/test_outbound.py
index db38502..6ba5264 100644
--- a/src/wormhole/test/dilate/test_outbound.py
+++ b/src/wormhole/test/dilate/test_outbound.py
@@ -24,7 +24,8 @@ def make_outbound():
     eq = EventualQueue(clock)
     term = mock.Mock(side_effect=lambda: True)  # one write per Eventual tick
 
-    def term_factory(): return term
+    def term_factory():
+        return term
     coop = Cooperator(terminationPredicateFactory=term_factory,
                       scheduler=eq.eventually)
     o = Outbound(m, coop)
@@ -567,7 +568,8 @@ def make_pushpull(pauses):
     eq = EventualQueue(clock)
     term = mock.Mock(side_effect=lambda: True)  # one write per Eventual tick
 
-    def term_factory(): return term
+    def term_factory():
+        return term
     coop = Cooperator(terminationPredicateFactory=term_factory,
                       scheduler=eq.eventually)
     pp = PullToPush(p, unregister, coop)
diff --git a/src/wormhole/test/test_machines.py b/src/wormhole/test/test_machines.py
index 35854ae..fe956c1 100644
--- a/src/wormhole/test/test_machines.py
+++ b/src/wormhole/test/test_machines.py
@@ -12,8 +12,8 @@ import mock
 from .. import (__version__, _allocator, _boss, _code, _input, _key, _lister,
                 _mailbox, _nameplate, _order, _receive, _rendezvous, _send,
                 _terminator, errors, timing)
-from .._interfaces import (IAllocator, IBoss, ICode, IDilator, IInput, IKey, ILister,
-                           IMailbox, INameplate, IOrder, IReceive,
+from .._interfaces import (IAllocator, IBoss, ICode, IDilator, IInput, IKey,
+                           ILister, IMailbox, INameplate, IOrder, IReceive,
                            IRendezvousConnector, ISend, ITerminator, IWordlist)
 from .._key import derive_key, derive_phase_key, encrypt_data
 from ..journal import ImmediateJournal