diff --git a/Tests/bench_cffi_access.py b/Tests/bench_cffi_access.py
index 99c7006fa..1797d34fc 100644
--- a/Tests/bench_cffi_access.py
+++ b/Tests/bench_cffi_access.py
@@ -1,8 +1,9 @@
 import time
+import unittest
 
 from PIL import PyAccess
 
-from .helper import PillowTestCase, hopper, unittest
+from .helper import PillowTestCase, hopper
 
 # Not running this test by default. No DOS against Travis CI.
 
diff --git a/Tests/check_fli_overflow.py b/Tests/check_fli_overflow.py
index db6559f1e..fa6037c2e 100644
--- a/Tests/check_fli_overflow.py
+++ b/Tests/check_fli_overflow.py
@@ -1,6 +1,8 @@
+import unittest
+
 from PIL import Image
 
-from .helper import PillowTestCase, unittest
+from .helper import PillowTestCase
 
 TEST_FILE = "Tests/images/fli_overflow.fli"
 
diff --git a/Tests/check_imaging_leaks.py b/Tests/check_imaging_leaks.py
index 34a570bb1..2c1793a4f 100755
--- a/Tests/check_imaging_leaks.py
+++ b/Tests/check_imaging_leaks.py
@@ -1,7 +1,9 @@
 #!/usr/bin/env python
+import unittest
+
 from PIL import Image
 
-from .helper import PillowTestCase, is_win32, unittest
+from .helper import PillowTestCase, is_win32
 
 min_iterations = 100
 max_iterations = 10000
diff --git a/Tests/check_j2k_leaks.py b/Tests/check_j2k_leaks.py
index d9c6c68b7..1635f1001 100755
--- a/Tests/check_j2k_leaks.py
+++ b/Tests/check_j2k_leaks.py
@@ -1,8 +1,9 @@
+import unittest
 from io import BytesIO
 
 from PIL import Image
 
-from .helper import PillowTestCase, is_win32, unittest
+from .helper import PillowTestCase, is_win32
 
 # Limits for testing the leak
 mem_limit = 1024 * 1048576
diff --git a/Tests/check_j2k_overflow.py b/Tests/check_j2k_overflow.py
index 3e6cf8d34..d5b6e455f 100644
--- a/Tests/check_j2k_overflow.py
+++ b/Tests/check_j2k_overflow.py
@@ -1,6 +1,8 @@
+import unittest
+
 from PIL import Image
 
-from .helper import PillowTestCase, unittest
+from .helper import PillowTestCase
 
 
 class TestJ2kEncodeOverflow(PillowTestCase):
diff --git a/Tests/check_jpeg_leaks.py b/Tests/check_jpeg_leaks.py
index 8cb93f2dd..6b2801a21 100644
--- a/Tests/check_jpeg_leaks.py
+++ b/Tests/check_jpeg_leaks.py
@@ -1,6 +1,7 @@
+import unittest
 from io import BytesIO
 
-from .helper import PillowTestCase, hopper, is_win32, unittest
+from .helper import PillowTestCase, hopper, is_win32
 
 iterations = 5000
 
diff --git a/Tests/check_large_memory.py b/Tests/check_large_memory.py
index 5df476e0a..7fcaa4cf9 100644
--- a/Tests/check_large_memory.py
+++ b/Tests/check_large_memory.py
@@ -1,8 +1,9 @@
 import sys
+import unittest
 
 from PIL import Image
 
-from .helper import PillowTestCase, unittest
+from .helper import PillowTestCase
 
 # This test is not run automatically.
 #
diff --git a/Tests/check_large_memory_numpy.py b/Tests/check_large_memory_numpy.py
index 4653a6013..8e65dc1cb 100644
--- a/Tests/check_large_memory_numpy.py
+++ b/Tests/check_large_memory_numpy.py
@@ -1,8 +1,9 @@
 import sys
+import unittest
 
 from PIL import Image
 
-from .helper import PillowTestCase, unittest
+from .helper import PillowTestCase
 
 # This test is not run automatically.
 #
diff --git a/Tests/check_libtiff_segfault.py b/Tests/check_libtiff_segfault.py
index ae9a46d1b..a0263f725 100644
--- a/Tests/check_libtiff_segfault.py
+++ b/Tests/check_libtiff_segfault.py
@@ -1,6 +1,8 @@
+import unittest
+
 from PIL import Image
 
-from .helper import PillowTestCase, unittest
+from .helper import PillowTestCase
 
 TEST_FILE = "Tests/images/libtiff_segfault.tif"
 
diff --git a/Tests/check_png_dos.py b/Tests/check_png_dos.py
index 5c78ce122..f133b2695 100644
--- a/Tests/check_png_dos.py
+++ b/Tests/check_png_dos.py
@@ -1,9 +1,10 @@
+import unittest
 import zlib
 from io import BytesIO
 
 from PIL import Image, ImageFile, PngImagePlugin
 
-from .helper import PillowTestCase, unittest
+from .helper import PillowTestCase
 
 TEST_FILE = "Tests/images/png_decompression_dos.png"
 
diff --git a/Tests/test_color_lut.py b/Tests/test_color_lut.py
index 301a99a3f..96461ca3a 100644
--- a/Tests/test_color_lut.py
+++ b/Tests/test_color_lut.py
@@ -1,8 +1,9 @@
+import unittest
 from array import array
 
 from PIL import Image, ImageFilter
 
-from .helper import PillowTestCase, unittest
+from .helper import PillowTestCase
 
 try:
     import numpy
diff --git a/Tests/test_core_resources.py b/Tests/test_core_resources.py
index 8d5fa5479..ac2970de2 100644
--- a/Tests/test_core_resources.py
+++ b/Tests/test_core_resources.py
@@ -1,8 +1,9 @@
 import sys
+import unittest
 
 from PIL import Image
 
-from .helper import PillowTestCase, is_pypy, unittest
+from .helper import PillowTestCase, is_pypy
 
 
 class TestCoreStats(PillowTestCase):
diff --git a/Tests/test_features.py b/Tests/test_features.py
index 96030bf56..eb51407a1 100644
--- a/Tests/test_features.py
+++ b/Tests/test_features.py
@@ -1,8 +1,9 @@
 import io
+import unittest
 
 from PIL import features
 
-from .helper import PillowTestCase, unittest
+from .helper import PillowTestCase
 
 try:
     from PIL import _webp
diff --git a/Tests/test_file_eps.py b/Tests/test_file_eps.py
index 82c510b18..0ab14e4eb 100644
--- a/Tests/test_file_eps.py
+++ b/Tests/test_file_eps.py
@@ -1,8 +1,9 @@
 import io
+import unittest
 
 from PIL import EpsImagePlugin, Image
 
-from .helper import PillowTestCase, hopper, unittest
+from .helper import PillowTestCase, hopper
 
 HAS_GHOSTSCRIPT = EpsImagePlugin.has_ghostscript()
 
diff --git a/Tests/test_file_fpx.py b/Tests/test_file_fpx.py
index 68412c8ca..7c985be30 100644
--- a/Tests/test_file_fpx.py
+++ b/Tests/test_file_fpx.py
@@ -1,4 +1,6 @@
-from .helper import PillowTestCase, unittest
+import unittest
+
+from .helper import PillowTestCase
 
 try:
     from PIL import FpxImagePlugin
diff --git a/Tests/test_file_gif.py b/Tests/test_file_gif.py
index 3ae960075..bed25c890 100644
--- a/Tests/test_file_gif.py
+++ b/Tests/test_file_gif.py
@@ -1,8 +1,9 @@
+import unittest
 from io import BytesIO
 
 from PIL import GifImagePlugin, Image, ImageDraw, ImagePalette
 
-from .helper import PillowTestCase, hopper, is_pypy, netpbm_available, unittest
+from .helper import PillowTestCase, hopper, is_pypy, netpbm_available
 
 try:
     from PIL import _webp
diff --git a/Tests/test_file_icns.py b/Tests/test_file_icns.py
index 4d7f95ec3..e258601ce 100644
--- a/Tests/test_file_icns.py
+++ b/Tests/test_file_icns.py
@@ -1,9 +1,10 @@
 import io
 import sys
+import unittest
 
 from PIL import IcnsImagePlugin, Image
 
-from .helper import PillowTestCase, unittest
+from .helper import PillowTestCase
 
 # sample icon file
 TEST_FILE = "Tests/images/pillow.icns"
diff --git a/Tests/test_file_mic.py b/Tests/test_file_mic.py
index f9ea7712c..00f42fa4a 100644
--- a/Tests/test_file_mic.py
+++ b/Tests/test_file_mic.py
@@ -1,6 +1,8 @@
+import unittest
+
 from PIL import Image, ImagePalette, features
 
-from .helper import PillowTestCase, hopper, unittest
+from .helper import PillowTestCase, hopper
 
 try:
     from PIL import MicImagePlugin
diff --git a/Tests/test_file_msp.py b/Tests/test_file_msp.py
index 5d512047b..d717ade16 100644
--- a/Tests/test_file_msp.py
+++ b/Tests/test_file_msp.py
@@ -1,8 +1,9 @@
 import os
+import unittest
 
 from PIL import Image, MspImagePlugin
 
-from .helper import PillowTestCase, hopper, unittest
+from .helper import PillowTestCase, hopper
 
 TEST_FILE = "Tests/images/hopper.msp"
 EXTRA_DIR = "Tests/images/picins"
diff --git a/Tests/test_file_png.py b/Tests/test_file_png.py
index 24279732d..c9c337e64 100644
--- a/Tests/test_file_png.py
+++ b/Tests/test_file_png.py
@@ -1,9 +1,10 @@
+import unittest
 import zlib
 from io import BytesIO
 
 from PIL import Image, ImageFile, PngImagePlugin
 
-from .helper import PillowLeakTestCase, PillowTestCase, hopper, is_win32, unittest
+from .helper import PillowLeakTestCase, PillowTestCase, hopper, is_win32
 
 try:
     from PIL import _webp
diff --git a/Tests/test_file_sun.py b/Tests/test_file_sun.py
index 84d59e0c7..5fc171054 100644
--- a/Tests/test_file_sun.py
+++ b/Tests/test_file_sun.py
@@ -1,8 +1,9 @@
 import os
+import unittest
 
 from PIL import Image, SunImagePlugin
 
-from .helper import PillowTestCase, hopper, unittest
+from .helper import PillowTestCase, hopper
 
 EXTRA_DIR = "Tests/images/sunraster"
 
diff --git a/Tests/test_file_tiff.py b/Tests/test_file_tiff.py
index dec3f5488..a4346a7b5 100644
--- a/Tests/test_file_tiff.py
+++ b/Tests/test_file_tiff.py
@@ -1,12 +1,13 @@
 import logging
 import os
+import unittest
 from io import BytesIO
 
 import pytest
 from PIL import Image, TiffImagePlugin
 from PIL.TiffImagePlugin import RESOLUTION_UNIT, X_RESOLUTION, Y_RESOLUTION
 
-from .helper import PillowTestCase, hopper, is_pypy, is_win32, unittest
+from .helper import PillowTestCase, hopper, is_pypy, is_win32
 
 logger = logging.getLogger(__name__)
 
diff --git a/Tests/test_file_webp.py b/Tests/test_file_webp.py
index 35ce3dba7..685f876e2 100644
--- a/Tests/test_file_webp.py
+++ b/Tests/test_file_webp.py
@@ -1,6 +1,8 @@
+import unittest
+
 from PIL import Image, WebPImagePlugin
 
-from .helper import PillowTestCase, hopper, unittest
+from .helper import PillowTestCase, hopper
 
 try:
     from PIL import _webp
diff --git a/Tests/test_file_webp_alpha.py b/Tests/test_file_webp_alpha.py
index 9693f691f..e3c2b98b9 100644
--- a/Tests/test_file_webp_alpha.py
+++ b/Tests/test_file_webp_alpha.py
@@ -1,6 +1,8 @@
+import unittest
+
 from PIL import Image
 
-from .helper import PillowTestCase, hopper, unittest
+from .helper import PillowTestCase, hopper
 
 try:
     from PIL import _webp
diff --git a/Tests/test_font_leaks.py b/Tests/test_font_leaks.py
index 06085392d..393ddb0fb 100644
--- a/Tests/test_font_leaks.py
+++ b/Tests/test_font_leaks.py
@@ -1,6 +1,8 @@
+import unittest
+
 from PIL import Image, ImageDraw, ImageFont, features
 
-from .helper import PillowLeakTestCase, is_win32, unittest
+from .helper import PillowLeakTestCase, is_win32
 
 
 @unittest.skipIf(is_win32(), "requires Unix or macOS")
diff --git a/Tests/test_image.py b/Tests/test_image.py
index 74cac4914..15cf435b0 100644
--- a/Tests/test_image.py
+++ b/Tests/test_image.py
@@ -1,10 +1,11 @@
 import os
 import shutil
 import tempfile
+import unittest
 
 from PIL import Image, UnidentifiedImageError
 
-from .helper import PillowTestCase, hopper, is_win32, unittest
+from .helper import PillowTestCase, hopper, is_win32
 
 
 class TestImage(PillowTestCase):
diff --git a/Tests/test_image_access.py b/Tests/test_image_access.py
index cd65e8dd0..57bac753d 100644
--- a/Tests/test_image_access.py
+++ b/Tests/test_image_access.py
@@ -2,11 +2,12 @@ import ctypes
 import os
 import subprocess
 import sys
+import unittest
 from distutils import ccompiler, sysconfig
 
 from PIL import Image
 
-from .helper import PillowTestCase, hopper, is_win32, on_ci, unittest
+from .helper import PillowTestCase, hopper, is_win32, on_ci
 
 # CFFI imports pycparser which doesn't support PYTHONOPTIMIZE=2
 # https://github.com/eliben/pycparser/pull/198#issuecomment-317001670
diff --git a/Tests/test_image_resample.py b/Tests/test_image_resample.py
index 26c65d544..00c8fa5f2 100644
--- a/Tests/test_image_resample.py
+++ b/Tests/test_image_resample.py
@@ -1,8 +1,9 @@
+import unittest
 from contextlib import contextmanager
 
 from PIL import Image, ImageDraw
 
-from .helper import PillowTestCase, hopper, unittest
+from .helper import PillowTestCase, hopper
 
 
 class TestImagingResampleVulnerability(PillowTestCase):
diff --git a/Tests/test_imagedraw.py b/Tests/test_imagedraw.py
index 75e658d65..50a774df2 100644
--- a/Tests/test_imagedraw.py
+++ b/Tests/test_imagedraw.py
@@ -1,8 +1,9 @@
 import os.path
+import unittest
 
 from PIL import Image, ImageColor, ImageDraw, ImageFont, features
 
-from .helper import PillowTestCase, hopper, unittest
+from .helper import PillowTestCase, hopper
 
 BLACK = (0, 0, 0)
 WHITE = (255, 255, 255)
diff --git a/Tests/test_imagedraw2.py b/Tests/test_imagedraw2.py
index 9ce472dd0..577727664 100644
--- a/Tests/test_imagedraw2.py
+++ b/Tests/test_imagedraw2.py
@@ -1,8 +1,9 @@
 import os.path
+import unittest
 
 from PIL import Image, ImageDraw2, features
 
-from .helper import PillowTestCase, hopper, unittest
+from .helper import PillowTestCase, hopper
 
 BLACK = (0, 0, 0)
 WHITE = (255, 255, 255)
diff --git a/Tests/test_imagefile.py b/Tests/test_imagefile.py
index dad408e93..228bbf929 100644
--- a/Tests/test_imagefile.py
+++ b/Tests/test_imagefile.py
@@ -1,8 +1,9 @@
+import unittest
 from io import BytesIO
 
 from PIL import EpsImagePlugin, Image, ImageFile
 
-from .helper import PillowTestCase, fromstring, hopper, tostring, unittest
+from .helper import PillowTestCase, fromstring, hopper, tostring
 
 try:
     from PIL import _webp
diff --git a/Tests/test_imagefont.py b/Tests/test_imagefont.py
index b7cfefacf..e34756a79 100644
--- a/Tests/test_imagefont.py
+++ b/Tests/test_imagefont.py
@@ -4,11 +4,12 @@ import os
 import re
 import shutil
 import sys
+import unittest
 from io import BytesIO
 
 from PIL import Image, ImageDraw, ImageFont, features
 
-from .helper import PillowTestCase, is_pypy, is_win32, unittest
+from .helper import PillowTestCase, is_pypy, is_win32
 
 FONT_PATH = "Tests/fonts/FreeMono.ttf"
 FONT_SIZE = 20
diff --git a/Tests/test_imagefont_bitmap.py b/Tests/test_imagefont_bitmap.py
index b7be8f723..eed0c70b6 100644
--- a/Tests/test_imagefont_bitmap.py
+++ b/Tests/test_imagefont_bitmap.py
@@ -1,6 +1,8 @@
+import unittest
+
 from PIL import Image, ImageDraw, ImageFont
 
-from .helper import PillowTestCase, unittest
+from .helper import PillowTestCase
 
 image_font_installed = True
 try:
diff --git a/Tests/test_imagefontctl.py b/Tests/test_imagefontctl.py
index 84bf1c58f..71efb897f 100644
--- a/Tests/test_imagefontctl.py
+++ b/Tests/test_imagefontctl.py
@@ -1,6 +1,8 @@
+import unittest
+
 from PIL import Image, ImageDraw, ImageFont, features
 
-from .helper import PillowTestCase, unittest
+from .helper import PillowTestCase
 
 FONT_SIZE = 20
 FONT_PATH = "Tests/fonts/DejaVuSans.ttf"
diff --git a/Tests/test_imageshow.py b/Tests/test_imageshow.py
index 225c8a6a9..858714e57 100644
--- a/Tests/test_imageshow.py
+++ b/Tests/test_imageshow.py
@@ -1,6 +1,8 @@
+import unittest
+
 from PIL import Image, ImageShow
 
-from .helper import PillowTestCase, hopper, is_win32, on_ci, on_github_actions, unittest
+from .helper import PillowTestCase, hopper, is_win32, on_ci, on_github_actions
 
 
 class TestImageShow(PillowTestCase):
diff --git a/Tests/test_imagetk.py b/Tests/test_imagetk.py
index 808ebd392..048efd639 100644
--- a/Tests/test_imagetk.py
+++ b/Tests/test_imagetk.py
@@ -1,6 +1,8 @@
+import unittest
+
 from PIL import Image
 
-from .helper import PillowTestCase, hopper, unittest
+from .helper import PillowTestCase, hopper
 
 try:
     from PIL import ImageTk
diff --git a/Tests/test_imagewin.py b/Tests/test_imagewin.py
index 2b2034187..1cd8c674e 100644
--- a/Tests/test_imagewin.py
+++ b/Tests/test_imagewin.py
@@ -1,6 +1,8 @@
+import unittest
+
 from PIL import ImageWin
 
-from .helper import PillowTestCase, hopper, is_win32, unittest
+from .helper import PillowTestCase, hopper, is_win32
 
 
 class TestImageWin(PillowTestCase):
diff --git a/Tests/test_lib_image.py b/Tests/test_lib_image.py
index 68e72bc4e..240783960 100644
--- a/Tests/test_lib_image.py
+++ b/Tests/test_lib_image.py
@@ -1,6 +1,8 @@
+import unittest
+
 from PIL import Image
 
-from .helper import PillowTestCase, unittest
+from .helper import PillowTestCase
 
 
 class TestLibImage(PillowTestCase):
diff --git a/Tests/test_locale.py b/Tests/test_locale.py
index 69bce68cf..0b1f330ac 100644
--- a/Tests/test_locale.py
+++ b/Tests/test_locale.py
@@ -1,8 +1,9 @@
 import locale
+import unittest
 
 from PIL import Image
 
-from .helper import PillowTestCase, unittest
+from .helper import PillowTestCase
 
 # ref https://github.com/python-pillow/Pillow/issues/272
 # on windows, in polish locale:
diff --git a/Tests/test_main.py b/Tests/test_main.py
index 15d4f7819..4f52149b6 100644
--- a/Tests/test_main.py
+++ b/Tests/test_main.py
@@ -1,9 +1,10 @@
 import os
 import subprocess
 import sys
+import unittest
 from unittest import TestCase
 
-from .helper import is_pypy, is_win32, on_github_actions, unittest
+from .helper import is_pypy, is_win32, on_github_actions
 
 
 class TestMain(TestCase):
diff --git a/Tests/test_map.py b/Tests/test_map.py
index 25e24e2fb..bdc3a7e2c 100644
--- a/Tests/test_map.py
+++ b/Tests/test_map.py
@@ -1,8 +1,9 @@
 import sys
+import unittest
 
 from PIL import Image
 
-from .helper import PillowTestCase, is_win32, unittest
+from .helper import PillowTestCase, is_win32
 
 try:
     import numpy
diff --git a/Tests/test_numpy.py b/Tests/test_numpy.py
index 358180f3f..7de5c3bbd 100644
--- a/Tests/test_numpy.py
+++ b/Tests/test_numpy.py
@@ -1,6 +1,8 @@
+import unittest
+
 from PIL import Image
 
-from .helper import PillowTestCase, hopper, unittest
+from .helper import PillowTestCase, hopper
 
 try:
     import numpy
diff --git a/Tests/test_pyroma.py b/Tests/test_pyroma.py
index 3455a502b..accad5451 100644
--- a/Tests/test_pyroma.py
+++ b/Tests/test_pyroma.py
@@ -1,6 +1,8 @@
+import unittest
+
 from PIL import __version__
 
-from .helper import PillowTestCase, unittest
+from .helper import PillowTestCase
 
 try:
     import pyroma
diff --git a/Tests/test_util.py b/Tests/test_util.py
index cb2101e1d..6a111b5b9 100644
--- a/Tests/test_util.py
+++ b/Tests/test_util.py
@@ -1,6 +1,8 @@
+import unittest
+
 from PIL import _util
 
-from .helper import PillowTestCase, unittest
+from .helper import PillowTestCase
 
 
 class TestUtil(PillowTestCase):
diff --git a/Tests/test_webp_leaks.py b/Tests/test_webp_leaks.py
index 93a6c2db0..713fc161e 100644
--- a/Tests/test_webp_leaks.py
+++ b/Tests/test_webp_leaks.py
@@ -1,8 +1,9 @@
+import unittest
 from io import BytesIO
 
 from PIL import Image, features
 
-from .helper import PillowLeakTestCase, unittest
+from .helper import PillowLeakTestCase
 
 test_file = "Tests/images/hopper.webp"