diff --git a/tests/persistence/test_inmemory.py b/tests/persistence/test_inmemory.py
index b0db46e7..9e3141de 100644
--- a/tests/persistence/test_inmemory.py
+++ b/tests/persistence/test_inmemory.py
@@ -1,11 +1,9 @@
 # -*- coding: utf-8 -*-
 import unittest
 
-from ..utils import ProcessWithCheckpoint
-
 import plumpy
 
-import plumpy
+from ..utils import ProcessWithCheckpoint
 
 
 class TestInMemoryPersister(unittest.TestCase):
diff --git a/tests/persistence/test_pickle.py b/tests/persistence/test_pickle.py
index dd68b4fd..da4ede51 100644
--- a/tests/persistence/test_pickle.py
+++ b/tests/persistence/test_pickle.py
@@ -5,10 +5,10 @@
 if getattr(tempfile, 'TemporaryDirectory', None) is None:
     from backports import tempfile
 
-from ..utils import ProcessWithCheckpoint
-
 import plumpy
 
+from ..utils import ProcessWithCheckpoint
+
 
 class TestPicklePersister(unittest.TestCase):
     def test_save_load_roundtrip(self):
diff --git a/tests/rmq/test_process_comms.py b/tests/rmq/test_process_comms.py
index 4c7a4f1a..c6826a24 100644
--- a/tests/rmq/test_process_comms.py
+++ b/tests/rmq/test_process_comms.py
@@ -1,6 +1,5 @@
 # -*- coding: utf-8 -*-
 import asyncio
-import copy
 
 import kiwipy
 import pytest
diff --git a/tests/test_communications.py b/tests/test_communications.py
index 37177d6e..f7e04255 100644
--- a/tests/test_communications.py
+++ b/tests/test_communications.py
@@ -4,8 +4,6 @@
 import pytest
 from kiwipy import CommunicatorHelper
 
-import pytest
-from kiwipy import CommunicatorHelper
 from plumpy.communications import LoopCommunicator
 
 
diff --git a/tests/test_expose.py b/tests/test_expose.py
index f48ce32e..c5e6014c 100644
--- a/tests/test_expose.py
+++ b/tests/test_expose.py
@@ -1,47 +1,11 @@
 # -*- coding: utf-8 -*-
 import unittest
 
-from .utils import NewLoopProcess
-
 from plumpy.ports import PortNamespace
 from plumpy.process_spec import ProcessSpec
 from plumpy.processes import Process
 
-
-def validator_function(input, port):
-    pass
-
-
-class BaseNamespaceProcess(NewLoopProcess):
-    @classmethod
-    def define(cls, spec):
-        super().define(spec)
-        spec.input('top')
-        spec.input('namespace.sub_one')
-        spec.input('namespace.sub_two')
-        spec.inputs['namespace'].valid_type = (int, float)
-        spec.inputs['namespace'].validator = validator_function
-
-
-class BaseProcess(NewLoopProcess):
-    @classmethod
-    def define(cls, spec):
-        super().define(spec)
-        spec.input('a', valid_type=str, default='a')
-        spec.input('b', valid_type=str, default='b')
-        spec.inputs.dynamic = True
-        spec.inputs.valid_type = str
-
-
-class ExposeProcess(NewLoopProcess):
-    @classmethod
-    def define(cls, spec):
-        super().define(spec)
-        spec.expose_inputs(BaseProcess, namespace='base.name.space')
-        spec.input('c', valid_type=int, default=1)
-        spec.input('d', valid_type=int, default=2)
-        spec.inputs.dynamic = True
-        spec.inputs.valid_type = int
+from .utils import NewLoopProcess
 
 
 def validator_function(input, port):
diff --git a/tests/test_process_comms.py b/tests/test_process_comms.py
index c59737ac..44947230 100644
--- a/tests/test_process_comms.py
+++ b/tests/test_process_comms.py
@@ -1,9 +1,9 @@
 # -*- coding: utf-8 -*-
 import pytest
-from tests import utils
 
 import plumpy
 from plumpy import process_comms
+from tests import utils
 
 
 class Process(plumpy.Process):
diff --git a/tests/test_processes.py b/tests/test_processes.py
index cec20c51..eb5bf599 100644
--- a/tests/test_processes.py
+++ b/tests/test_processes.py
@@ -3,19 +3,16 @@
 
 import asyncio
 import enum
-from plumpy.process_comms import KillMessage
 import unittest
 
 import kiwipy
 import pytest
-from tests import utils
-
-import plumpy
-import pytest
 
 import plumpy
 from plumpy import BundleKeys, Process, ProcessState
+from plumpy.process_comms import KillMessage
 from plumpy.utils import AttributesFrozendict
+from tests import utils
 
 
 class ForgetToCallParent(plumpy.Process):