diff --git a/test/plugins/test_advancedrewrite.py b/test/plugins/test_advancedrewrite.py
index 71f92c4dd..0d491f8a7 100644
--- a/test/plugins/test_advancedrewrite.py
+++ b/test/plugins/test_advancedrewrite.py
@@ -17,13 +17,13 @@
 
 import unittest
 
-from beets.test.helper import TestHelper
+from beets.test.helper import BeetsTestCase
 from beets.ui import UserError
 
 PLUGIN_NAME = "advancedrewrite"
 
 
-class AdvancedRewritePluginTest(unittest.TestCase, TestHelper):
+class AdvancedRewritePluginTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
 
diff --git a/test/plugins/test_albumtypes.py b/test/plugins/test_albumtypes.py
index 6b3b48d10..4a32db382 100644
--- a/test/plugins/test_albumtypes.py
+++ b/test/plugins/test_albumtypes.py
@@ -15,15 +15,14 @@
 """Tests for the 'albumtypes' plugin."""
 
 
-import unittest
 from typing import Sequence, Tuple
 
 from beets.autotag.mb import VARIOUS_ARTISTS_ID
-from beets.test.helper import TestHelper
+from beets.test.helper import BeetsTestCase
 from beetsplug.albumtypes import AlbumTypesPlugin
 
 
-class AlbumTypesPluginTest(unittest.TestCase, TestHelper):
+class AlbumTypesPluginTest(BeetsTestCase):
     """Tests for albumtypes plugin."""
 
     def setUp(self):
diff --git a/test/plugins/test_bareasc.py b/test/plugins/test_bareasc.py
index feb99953c..02af15f8d 100644
--- a/test/plugins/test_bareasc.py
+++ b/test/plugins/test_bareasc.py
@@ -6,10 +6,10 @@
 import unittest
 
 from beets import logging
-from beets.test.helper import TestHelper, capture_stdout
+from beets.test.helper import BeetsTestCase, capture_stdout
 
 
-class BareascPluginTest(unittest.TestCase, TestHelper):
+class BareascPluginTest(BeetsTestCase):
     """Test bare ASCII query matching."""
 
     def setUp(self):
diff --git a/test/plugins/test_bucket.py b/test/plugins/test_bucket.py
index 4f43f5ef5..adae967b2 100644
--- a/test/plugins/test_bucket.py
+++ b/test/plugins/test_bucket.py
@@ -18,11 +18,11 @@
 import unittest
 
 from beets import config, ui
-from beets.test.helper import TestHelper
+from beets.test.helper import BeetsTestCase
 from beetsplug import bucket
 
 
-class BucketPluginTest(unittest.TestCase, TestHelper):
+class BucketPluginTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
         self.plugin = bucket.BucketPlugin()
diff --git a/test/plugins/test_edit.py b/test/plugins/test_edit.py
index 7c1fcf0b3..32095748f 100644
--- a/test/plugins/test_edit.py
+++ b/test/plugins/test_edit.py
@@ -21,9 +21,9 @@ from beets.library import Item
 from beets.test import _common
 from beets.test.helper import (
     AutotagStub,
+    BeetsTestCase,
     ImportHelper,
     TerminalImportSessionSetup,
-    TestHelper,
     control_stdin,
 )
 from beetsplug.edit import EditPlugin
@@ -115,7 +115,7 @@ class EditMixin:
 
 @_common.slow_test()
 @patch("beets.library.Item.write")
-class EditCommandTest(unittest.TestCase, TestHelper, EditMixin):
+class EditCommandTest(BeetsTestCase, EditMixin):
     """Black box tests for `beetsplug.edit`. Command line interaction is
     simulated using `test.helper.control_stdin()`, and yaml editing via an
     external editor is simulated using `ModifyFileMocker`.
@@ -323,11 +323,7 @@ class EditCommandTest(unittest.TestCase, TestHelper, EditMixin):
 
 @_common.slow_test()
 class EditDuringImporterTest(
-    TerminalImportSessionSetup,
-    unittest.TestCase,
-    ImportHelper,
-    TestHelper,
-    EditMixin,
+    TerminalImportSessionSetup, BeetsTestCase, ImportHelper, EditMixin
 ):
     """TODO"""
 
diff --git a/test/plugins/test_embedart.py b/test/plugins/test_embedart.py
index d280fefd9..4d78582b5 100644
--- a/test/plugins/test_embedart.py
+++ b/test/plugins/test_embedart.py
@@ -24,7 +24,7 @@ from mediafile import MediaFile
 
 from beets import art, config, logging, ui
 from beets.test import _common
-from beets.test.helper import FetchImageHelper, TestHelper
+from beets.test.helper import BeetsTestCase, FetchImageHelper
 from beets.util import bytestring_path, displayable_path, syspath
 from beets.util.artresizer import ArtResizer
 
@@ -40,7 +40,7 @@ def require_artresizer_compare(test):
     return wrapper
 
 
-class EmbedartCliTest(TestHelper, FetchImageHelper):
+class EmbedartCliTest(FetchImageHelper, BeetsTestCase):
     small_artpath = os.path.join(_common.RSRC, b"image-2x3.jpg")
     abbey_artpath = os.path.join(_common.RSRC, b"abbey.jpg")
     abbey_similarpath = os.path.join(_common.RSRC, b"abbey-similar.jpg")
diff --git a/test/plugins/test_embyupdate.py b/test/plugins/test_embyupdate.py
index 57859f5ac..a2d527c21 100644
--- a/test/plugins/test_embyupdate.py
+++ b/test/plugins/test_embyupdate.py
@@ -2,11 +2,11 @@ import unittest
 
 import responses
 
-from beets.test.helper import TestHelper
+from beets.test.helper import BeetsTestCase
 from beetsplug import embyupdate
 
 
-class EmbyUpdateTest(unittest.TestCase, TestHelper):
+class EmbyUpdateTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
         self.load_plugins("embyupdate")
diff --git a/test/plugins/test_export.py b/test/plugins/test_export.py
index b949fe4f8..746293130 100644
--- a/test/plugins/test_export.py
+++ b/test/plugins/test_export.py
@@ -22,10 +22,10 @@ import unittest
 from xml.etree import ElementTree
 from xml.etree.ElementTree import Element
 
-from beets.test.helper import TestHelper
+from beets.test.helper import BeetsTestCase
 
 
-class ExportPluginTest(unittest.TestCase, TestHelper):
+class ExportPluginTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
         self.load_plugins("export")
diff --git a/test/plugins/test_fetchart.py b/test/plugins/test_fetchart.py
index b3307472a..61075c792 100644
--- a/test/plugins/test_fetchart.py
+++ b/test/plugins/test_fetchart.py
@@ -19,10 +19,10 @@ import sys
 import unittest
 
 from beets import util
-from beets.test.helper import TestHelper
+from beets.test.helper import BeetsTestCase
 
 
-class FetchartCliTest(unittest.TestCase, TestHelper):
+class FetchartCliTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
         self.load_plugins("fetchart")
diff --git a/test/plugins/test_ftintitle.py b/test/plugins/test_ftintitle.py
index 60dd3668e..923bf14ef 100644
--- a/test/plugins/test_ftintitle.py
+++ b/test/plugins/test_ftintitle.py
@@ -17,11 +17,11 @@
 
 import unittest
 
-from beets.test.helper import TestHelper
+from beets.test.helper import BeetsTestCase
 from beetsplug import ftintitle
 
 
-class FtInTitlePluginFunctional(unittest.TestCase, TestHelper):
+class FtInTitlePluginFunctional(BeetsTestCase):
     def setUp(self):
         """Set up configuration"""
         self.setup_beets()
diff --git a/test/plugins/test_info.py b/test/plugins/test_info.py
index bfba739c5..bb8f97cf0 100644
--- a/test/plugins/test_info.py
+++ b/test/plugins/test_info.py
@@ -17,11 +17,11 @@ import unittest
 
 from mediafile import MediaFile
 
-from beets.test.helper import TestHelper
+from beets.test.helper import BeetsTestCase
 from beets.util import displayable_path
 
 
-class InfoTest(unittest.TestCase, TestHelper):
+class InfoTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
         self.load_plugins("info")
diff --git a/test/plugins/test_ipfs.py b/test/plugins/test_ipfs.py
index 65b713101..dcea85288 100644
--- a/test/plugins/test_ipfs.py
+++ b/test/plugins/test_ipfs.py
@@ -18,13 +18,13 @@ from unittest.mock import Mock, patch
 
 from beets import library
 from beets.test import _common
-from beets.test.helper import TestHelper
+from beets.test.helper import BeetsTestCase
 from beets.util import _fsencoding, bytestring_path
 from beetsplug.ipfs import IPFSPlugin
 
 
 @patch("beets.util.command_output", Mock())
-class IPFSPluginTest(unittest.TestCase, TestHelper):
+class IPFSPluginTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
         self.load_plugins("ipfs")
diff --git a/test/plugins/test_keyfinder.py b/test/plugins/test_keyfinder.py
index 8509fe357..329733b47 100644
--- a/test/plugins/test_keyfinder.py
+++ b/test/plugins/test_keyfinder.py
@@ -18,11 +18,11 @@ from unittest.mock import patch
 
 from beets import util
 from beets.library import Item
-from beets.test.helper import TestHelper
+from beets.test.helper import BeetsTestCase
 
 
 @patch("beets.util.command_output")
-class KeyFinderTest(unittest.TestCase, TestHelper):
+class KeyFinderTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
         self.load_plugins("keyfinder")
diff --git a/test/plugins/test_lastgenre.py b/test/plugins/test_lastgenre.py
index 6f250c3ba..bf36039df 100644
--- a/test/plugins/test_lastgenre.py
+++ b/test/plugins/test_lastgenre.py
@@ -20,11 +20,11 @@ from unittest.mock import Mock
 
 from beets import config
 from beets.test import _common
-from beets.test.helper import TestHelper
+from beets.test.helper import BeetsTestCase
 from beetsplug import lastgenre
 
 
-class LastGenrePluginTest(unittest.TestCase, TestHelper):
+class LastGenrePluginTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
         self.plugin = lastgenre.LastGenrePlugin()
diff --git a/test/plugins/test_limit.py b/test/plugins/test_limit.py
index 0ed6c9202..1ea57894c 100644
--- a/test/plugins/test_limit.py
+++ b/test/plugins/test_limit.py
@@ -15,10 +15,10 @@
 
 import unittest
 
-from beets.test.helper import TestHelper
+from beets.test.helper import BeetsTestCase
 
 
-class LimitPluginTest(unittest.TestCase, TestHelper):
+class LimitPluginTest(BeetsTestCase):
     """Unit tests for LimitPlugin
 
     Note: query prefix tests do not work correctly with `run_with_output`.
diff --git a/test/plugins/test_mbsubmit.py b/test/plugins/test_mbsubmit.py
index 40024bc71..e0821557b 100644
--- a/test/plugins/test_mbsubmit.py
+++ b/test/plugins/test_mbsubmit.py
@@ -17,16 +17,16 @@ import unittest
 
 from beets.test.helper import (
     AutotagStub,
+    BeetsTestCase,
     ImportHelper,
     TerminalImportSessionSetup,
-    TestHelper,
     capture_stdout,
     control_stdin,
 )
 
 
 class MBSubmitPluginTest(
-    TerminalImportSessionSetup, unittest.TestCase, ImportHelper, TestHelper
+    TerminalImportSessionSetup, BeetsTestCase, ImportHelper
 ):
     def setUp(self):
         self.setup_beets()
diff --git a/test/plugins/test_mbsync.py b/test/plugins/test_mbsync.py
index bc41b3464..cc6837c51 100644
--- a/test/plugins/test_mbsync.py
+++ b/test/plugins/test_mbsync.py
@@ -19,14 +19,14 @@ from unittest.mock import patch
 from beets import config
 from beets.library import Item
 from beets.test.helper import (
-    TestHelper,
+    BeetsTestCase,
     capture_log,
     generate_album_info,
     generate_track_info,
 )
 
 
-class MbsyncCliTest(unittest.TestCase, TestHelper):
+class MbsyncCliTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
         self.load_plugins("mbsync")
diff --git a/test/plugins/test_mpdstats.py b/test/plugins/test_mpdstats.py
index 40804fabb..1dc9b3a6e 100644
--- a/test/plugins/test_mpdstats.py
+++ b/test/plugins/test_mpdstats.py
@@ -18,11 +18,11 @@ from unittest.mock import ANY, Mock, call, patch
 
 from beets import util
 from beets.library import Item
-from beets.test.helper import TestHelper
+from beets.test.helper import BeetsTestCase
 from beetsplug.mpdstats import MPDStats
 
 
-class MPDStatsTest(unittest.TestCase, TestHelper):
+class MPDStatsTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
         self.load_plugins("mpdstats")
diff --git a/test/plugins/test_parentwork.py b/test/plugins/test_parentwork.py
index 377784983..372c1ed2f 100644
--- a/test/plugins/test_parentwork.py
+++ b/test/plugins/test_parentwork.py
@@ -20,7 +20,7 @@ import unittest
 from unittest.mock import patch
 
 from beets.library import Item
-from beets.test.helper import TestHelper
+from beets.test.helper import BeetsTestCase
 from beetsplug import parentwork
 
 work = {
@@ -85,7 +85,7 @@ def mock_workid_response(mbid, includes):
         return p_work
 
 
-class ParentWorkIntegrationTest(unittest.TestCase, TestHelper):
+class ParentWorkIntegrationTest(BeetsTestCase):
     def setUp(self):
         """Set up configuration"""
         self.setup_beets()
@@ -180,7 +180,7 @@ class ParentWorkIntegrationTest(unittest.TestCase, TestHelper):
         )
 
 
-class ParentWorkTest(unittest.TestCase, TestHelper):
+class ParentWorkTest(BeetsTestCase):
     def setUp(self):
         """Set up configuration"""
         self.setup_beets()
diff --git a/test/plugins/test_permissions.py b/test/plugins/test_permissions.py
index d10a873cd..82fb3c443 100644
--- a/test/plugins/test_permissions.py
+++ b/test/plugins/test_permissions.py
@@ -7,7 +7,7 @@ import unittest
 from unittest.mock import Mock, patch
 
 from beets.test._common import touch
-from beets.test.helper import TestHelper
+from beets.test.helper import BeetsTestCase
 from beets.util import displayable_path
 from beetsplug.permissions import (
     check_permissions,
@@ -16,7 +16,7 @@ from beetsplug.permissions import (
 )
 
 
-class PermissionsPluginTest(unittest.TestCase, TestHelper):
+class PermissionsPluginTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
         self.load_plugins("permissions")
diff --git a/test/plugins/test_play.py b/test/plugins/test_play.py
index ac60e8281..8dcf9d044 100644
--- a/test/plugins/test_play.py
+++ b/test/plugins/test_play.py
@@ -20,14 +20,14 @@ import sys
 import unittest
 from unittest.mock import ANY, patch
 
-from beets.test.helper import CleanupModulesMixin, TestHelper, control_stdin
+from beets.test.helper import BeetsTestCase, CleanupModulesMixin, control_stdin
 from beets.ui import UserError
 from beets.util import open_anything
 from beetsplug.play import PlayPlugin
 
 
 @patch("beetsplug.play.util.interactive_open")
-class PlayPluginTest(CleanupModulesMixin, unittest.TestCase, TestHelper):
+class PlayPluginTest(CleanupModulesMixin, BeetsTestCase):
     modules = (PlayPlugin.__module__,)
 
     def setUp(self):
diff --git a/test/plugins/test_player.py b/test/plugins/test_player.py
index f7c9c892d..486808d33 100644
--- a/test/plugins/test_player.py
+++ b/test/plugins/test_player.py
@@ -32,7 +32,7 @@ from unittest import mock
 import confuse
 import yaml
 
-from beets.test.helper import TestHelper
+from beets.test.helper import BeetsTestCase
 from beets.util import bluelet
 from beetsplug import bpd
 
@@ -277,7 +277,7 @@ def start_server(args, assigned_port, listener_patch):
     beets.ui.main(args)
 
 
-class BPDTestHelper(unittest.TestCase, TestHelper):
+class BPDTestHelper(BeetsTestCase):
     def setUp(self):
         self.setup_beets(disk=True)
         self.load_plugins("bpd")
diff --git a/test/plugins/test_playlist.py b/test/plugins/test_playlist.py
index a4e6a91f9..63018ef68 100644
--- a/test/plugins/test_playlist.py
+++ b/test/plugins/test_playlist.py
@@ -18,10 +18,11 @@ import unittest
 from shlex import quote
 
 import beets
-from beets.test import _common, helper
+from beets.test import _common
+from beets.test.helper import BeetsTestCase
 
 
-class PlaylistTestHelper(helper.TestHelper):
+class PlaylistTestCase(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
         self.lib = beets.library.Library(":memory:")
@@ -88,7 +89,7 @@ class PlaylistTestHelper(helper.TestHelper):
         self.teardown_beets()
 
 
-class PlaylistQueryTestHelper(PlaylistTestHelper):
+class PlaylistQueryTest:
     def test_name_query_with_absolute_paths_in_playlist(self):
         q = "playlist:absolute"
         results = self.lib.items(q)
@@ -166,7 +167,7 @@ class PlaylistQueryTestHelper(PlaylistTestHelper):
         self.assertEqual(set(results), set())
 
 
-class PlaylistTestRelativeToLib(PlaylistQueryTestHelper, unittest.TestCase):
+class PlaylistTestRelativeToLib(PlaylistQueryTest, PlaylistTestCase):
     def setup_test(self):
         with open(os.path.join(self.playlist_dir, "absolute.m3u"), "w") as f:
             f.write(
@@ -187,7 +188,7 @@ class PlaylistTestRelativeToLib(PlaylistQueryTestHelper, unittest.TestCase):
         self.config["playlist"]["relative_to"] = "library"
 
 
-class PlaylistTestRelativeToDir(PlaylistQueryTestHelper, unittest.TestCase):
+class PlaylistTestRelativeToDir(PlaylistQueryTest, PlaylistTestCase):
     def setup_test(self):
         with open(os.path.join(self.playlist_dir, "absolute.m3u"), "w") as f:
             f.write(
@@ -208,7 +209,7 @@ class PlaylistTestRelativeToDir(PlaylistQueryTestHelper, unittest.TestCase):
         self.config["playlist"]["relative_to"] = self.music_dir
 
 
-class PlaylistTestRelativeToPls(PlaylistQueryTestHelper, unittest.TestCase):
+class PlaylistTestRelativeToPls(PlaylistQueryTest, PlaylistTestCase):
     def setup_test(self):
         with open(os.path.join(self.playlist_dir, "absolute.m3u"), "w") as f:
             f.write(
@@ -251,7 +252,7 @@ class PlaylistTestRelativeToPls(PlaylistQueryTestHelper, unittest.TestCase):
         self.config["playlist"]["playlist_dir"] = self.playlist_dir
 
 
-class PlaylistUpdateTestHelper(PlaylistTestHelper):
+class PlaylistUpdateTest:
     def setup_test(self):
         with open(os.path.join(self.playlist_dir, "absolute.m3u"), "w") as f:
             f.write(
@@ -273,7 +274,7 @@ class PlaylistUpdateTestHelper(PlaylistTestHelper):
         self.config["playlist"]["relative_to"] = "library"
 
 
-class PlaylistTestItemMoved(PlaylistUpdateTestHelper, unittest.TestCase):
+class PlaylistTestItemMoved(PlaylistUpdateTest, PlaylistTestCase):
     def test_item_moved(self):
         # Emit item_moved event for an item that is in a playlist
         results = self.lib.items(
@@ -339,7 +340,7 @@ class PlaylistTestItemMoved(PlaylistUpdateTestHelper, unittest.TestCase):
         )
 
 
-class PlaylistTestItemRemoved(PlaylistUpdateTestHelper, unittest.TestCase):
+class PlaylistTestItemRemoved(PlaylistUpdateTest, PlaylistTestCase):
     def test_item_removed(self):
         # Emit item_removed event for an item that is in a playlist
         results = self.lib.items(
diff --git a/test/plugins/test_plexupdate.py b/test/plugins/test_plexupdate.py
index f45ea9d8f..e8e7b83b4 100644
--- a/test/plugins/test_plexupdate.py
+++ b/test/plugins/test_plexupdate.py
@@ -2,11 +2,11 @@ import unittest
 
 import responses
 
-from beets.test.helper import TestHelper
+from beets.test.helper import BeetsTestCase
 from beetsplug.plexupdate import get_music_section, update_plex
 
 
-class PlexUpdateTest(unittest.TestCase, TestHelper):
+class PlexUpdateTest(BeetsTestCase):
     def add_response_get_music_section(self, section_name="Music"):
         """Create response for mocking the get_music_section function."""
 
diff --git a/test/plugins/test_random.py b/test/plugins/test_random.py
index b371fa832..842e018eb 100644
--- a/test/plugins/test_random.py
+++ b/test/plugins/test_random.py
@@ -24,7 +24,7 @@ from beets import random
 from beets.test.helper import TestHelper
 
 
-class RandomTest(unittest.TestCase, TestHelper):
+class RandomTest(TestHelper, unittest.TestCase):
     def setUp(self):
         self.lib = None
         self.artist1 = "Artist 1"
@@ -37,9 +37,6 @@ class RandomTest(unittest.TestCase, TestHelper):
         self.random_gen = Random()
         self.random_gen.seed(12345)
 
-    def tearDown(self):
-        pass
-
     def _stats(self, data):
         mean = sum(data) / len(data)
         stdev = math.sqrt(sum((p - mean) ** 2 for p in data) / (len(data) - 1))
diff --git a/test/plugins/test_thumbnails.py b/test/plugins/test_thumbnails.py
index 951fc6e8c..942b91db0 100644
--- a/test/plugins/test_thumbnails.py
+++ b/test/plugins/test_thumbnails.py
@@ -19,7 +19,7 @@ from shutil import rmtree
 from tempfile import mkdtemp
 from unittest.mock import Mock, call, patch
 
-from beets.test.helper import TestHelper
+from beets.test.helper import BeetsTestCase
 from beets.util import bytestring_path, syspath
 from beetsplug.thumbnails import (
     LARGE_DIR,
@@ -30,7 +30,7 @@ from beetsplug.thumbnails import (
 )
 
 
-class ThumbnailsTest(unittest.TestCase, TestHelper):
+class ThumbnailsTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
 
diff --git a/test/plugins/test_types_plugin.py b/test/plugins/test_types_plugin.py
index 8225c3302..54766e7aa 100644
--- a/test/plugins/test_types_plugin.py
+++ b/test/plugins/test_types_plugin.py
@@ -19,10 +19,10 @@ from datetime import datetime
 
 from confuse import ConfigValueError
 
-from beets.test.helper import TestHelper
+from beets.test.helper import BeetsTestCase
 
 
-class TypesPluginTest(unittest.TestCase, TestHelper):
+class TypesPluginTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
         self.load_plugins("types")
diff --git a/test/plugins/test_zero.py b/test/plugins/test_zero.py
index 378e419d5..1925bd464 100644
--- a/test/plugins/test_zero.py
+++ b/test/plugins/test_zero.py
@@ -5,12 +5,12 @@ import unittest
 from mediafile import MediaFile
 
 from beets.library import Item
-from beets.test.helper import TestHelper, control_stdin
+from beets.test.helper import BeetsTestCase, control_stdin
 from beets.util import syspath
 from beetsplug.zero import ZeroPlugin
 
 
-class ZeroPluginTest(unittest.TestCase, TestHelper):
+class ZeroPluginTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
         self.config["zero"] = {
diff --git a/test/test_config_command.py b/test/test_config_command.py
index 0b122cf1c..72a0affd9 100644
--- a/test/test_config_command.py
+++ b/test/test_config_command.py
@@ -5,10 +5,10 @@ from unittest.mock import patch
 import yaml
 
 from beets import config, ui
-from beets.test.helper import TestHelper
+from beets.test.helper import BeetsTestCase
 
 
-class ConfigCommandTest(unittest.TestCase, TestHelper):
+class ConfigCommandTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
         for k in ("VISUAL", "EDITOR"):
diff --git a/test/test_importer.py b/test/test_importer.py
index 8c2b474e0..f3a255e4e 100644
--- a/test/test_importer.py
+++ b/test/test_importer.py
@@ -38,7 +38,6 @@ from beets.test.helper import (
     AutotagStub,
     BeetsTestCase,
     ImportHelper,
-    TestHelper,
     capture_log,
     has_program,
 )
@@ -1171,7 +1170,7 @@ def match_album_mock(*args, **kwargs):
 
 
 @patch("beets.autotag.mb.match_album", Mock(side_effect=match_album_mock))
-class ImportDuplicateAlbumTest(unittest.TestCase, TestHelper):
+class ImportDuplicateAlbumTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
 
@@ -1293,7 +1292,7 @@ def match_track_mock(*args, **kwargs):
 
 
 @patch("beets.autotag.mb.match_track", Mock(side_effect=match_track_mock))
-class ImportDuplicateSingletonTest(unittest.TestCase, TestHelper):
+class ImportDuplicateSingletonTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
 
@@ -1382,7 +1381,7 @@ class TagLogTest(BeetsTestCase):
         self.assertIn("status caf\xe9", sio.getvalue())
 
 
-class ResumeImportTest(unittest.TestCase, TestHelper):
+class ResumeImportTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
 
@@ -1433,7 +1432,7 @@ class ResumeImportTest(unittest.TestCase, TestHelper):
         self.assertIsNotNone(self.lib.items("title:track 1").get())
 
 
-class IncrementalImportTest(unittest.TestCase, TestHelper):
+class IncrementalImportTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
         self.config["import"]["incremental"] = True
diff --git a/test/test_library.py b/test/test_library.py
index 179927dc9..7d27604d6 100644
--- a/test/test_library.py
+++ b/test/test_library.py
@@ -32,7 +32,7 @@ import beets.library
 from beets import config, plugins, util
 from beets.test import _common
 from beets.test._common import item
-from beets.test.helper import BeetsTestCase, LibTestCase, TestHelper
+from beets.test.helper import BeetsTestCase, LibTestCase
 from beets.util import bytestring_path, syspath
 
 # Shortcut to path normalization.
@@ -1267,7 +1267,7 @@ class UnicodePathTest(LibTestCase):
         self.i.write()
 
 
-class WriteTest(unittest.TestCase, TestHelper):
+class WriteTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
 
@@ -1355,7 +1355,7 @@ class ItemReadTest(unittest.TestCase):
             item.read("/thisfiledoesnotexist")
 
 
-class FilesizeTest(unittest.TestCase, TestHelper):
+class FilesizeTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
 
diff --git a/test/test_logging.py b/test/test_logging.py
index db7f33bfd..0cd3d4821 100644
--- a/test/test_logging.py
+++ b/test/test_logging.py
@@ -47,7 +47,7 @@ class LoggingTest(BeetsTestCase):
         self.assertTrue(stream.getvalue(), "foo oof baz")
 
 
-class LoggingLevelTest(unittest.TestCase, helper.TestHelper):
+class LoggingLevelTest(BeetsTestCase):
     class DummyModule:
         class DummyPlugin(plugins.BeetsPlugin):
             def __init__(self):
diff --git a/test/test_plugins.py b/test/test_plugins.py
index 707c7db31..284cee041 100644
--- a/test/test_plugins.py
+++ b/test/test_plugins.py
@@ -35,9 +35,9 @@ from beets.test import helper
 from beets.test._common import RSRC
 from beets.test.helper import (
     AutotagStub,
+    BeetsTestCase,
     ImportHelper,
     TerminalImportSessionSetup,
-    TestHelper,
 )
 from beets.util import bytestring_path, displayable_path, syspath
 from beets.util.id_extractors import (
@@ -47,7 +47,7 @@ from beets.util.id_extractors import (
 )
 
 
-class PluginLoaderTestCase(unittest.TestCase, TestHelper):
+class PluginLoaderTestCase(BeetsTestCase):
     def setup_plugin_loader(self):
         # FIXME the mocking code is horrific, but this is the lowest and
         # earliest level of the plugin mechanism we can hook into.
diff --git a/test/test_query.py b/test/test_query.py
index 897b247dc..a5a2091bf 100644
--- a/test/test_query.py
+++ b/test/test_query.py
@@ -30,7 +30,7 @@ from beets.dbcore.query import (
     ParsingError,
 )
 from beets.library import Item, Library
-from beets.test import _common, helper
+from beets.test import _common
 from beets.test.helper import BeetsTestCase, LibTestCase
 from beets.util import syspath
 
@@ -39,7 +39,13 @@ from beets.util import syspath
 WIN32_NO_IMPLICIT_PATHS = "Implicit paths are not supported on Windows"
 
 
-class TestHelper(helper.TestHelper):
+class AssertsMixin:
+    def assert_items_matched(self, results, titles):
+        self.assertEqual({i.title for i in results}, set(titles))
+
+    def assert_albums_matched(self, results, albums):
+        self.assertEqual({a.album for a in results}, set(albums))
+
     def assertInResult(self, item, results):  # noqa
         result_ids = [i.id for i in results]
         self.assertIn(item.id, result_ids)
@@ -83,14 +89,6 @@ class AnyFieldQueryTest(LibTestCase):
         self.assertNotEqual(q1, q2)
 
 
-class AssertsMixin:
-    def assert_items_matched(self, results, titles):
-        self.assertEqual({i.title for i in results}, set(titles))
-
-    def assert_albums_matched(self, results, albums):
-        self.assertEqual({a.album for a in results}, set(albums))
-
-
 # A test case class providing a library with some dummy data and some
 # assertions involving that data.
 class DummyDataTestCase(BeetsTestCase, AssertsMixin):
@@ -488,7 +486,7 @@ class MatchTest(BeetsTestCase):
         self.assertNotEqual(q3, q4)
 
 
-class PathQueryTest(LibTestCase, TestHelper, AssertsMixin):
+class PathQueryTest(LibTestCase, AssertsMixin):
     def setUp(self):
         super().setUp()
 
@@ -726,11 +724,12 @@ class PathQueryTest(LibTestCase, TestHelper, AssertsMixin):
             os.chdir(cur_dir)
 
 
-class IntQueryTest(unittest.TestCase, TestHelper):
+class IntQueryTest(BeetsTestCase):
     def setUp(self):
         self.lib = Library(":memory:")
 
     def tearDown(self):
+        super().tearDown()
         Item._types = {}
 
     def test_exact_value_match(self):
@@ -764,12 +763,14 @@ class IntQueryTest(unittest.TestCase, TestHelper):
         self.assertIsNone(matched)
 
 
-class BoolQueryTest(unittest.TestCase, TestHelper):
+class BoolQueryTest(BeetsTestCase, AssertsMixin):
     def setUp(self):
+        super().setUp()
         self.lib = Library(":memory:")
         Item._types = {"flexbool": types.Boolean()}
 
     def tearDown(self):
+        super().tearDown()
         Item._types = {}
 
     def test_parse_true(self):
@@ -834,8 +835,9 @@ class DefaultSearchFieldsTest(DummyDataTestCase):
         self.assert_items_matched(items, [])
 
 
-class NoneQueryTest(unittest.TestCase, TestHelper):
+class NoneQueryTest(BeetsTestCase, AssertsMixin):
     def setUp(self):
+        super().setUp()
         self.lib = Library(":memory:")
 
     def test_match_singletons(self):
diff --git a/test/test_ui.py b/test/test_ui.py
index 9ca68992a..8b3ef7276 100644
--- a/test/test_ui.py
+++ b/test/test_ui.py
@@ -32,7 +32,6 @@ from beets.autotag.match import distance
 from beets.test import _common
 from beets.test.helper import (
     BeetsTestCase,
-    TestHelper,
     capture_stdout,
     control_stdin,
     has_program,
@@ -190,7 +189,7 @@ class RemoveTest(BeetsTestCase):
         self.assertEqual(num_existing, 1)
 
 
-class ModifyTest(unittest.TestCase, TestHelper):
+class ModifyTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
         self.album = self.add_album_fixture()
@@ -404,7 +403,7 @@ class ModifyTest(unittest.TestCase, TestHelper):
         self.assertEqual(mods, {"title": "newTitle"})
 
 
-class WriteTest(unittest.TestCase, TestHelper):
+class WriteTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
 
@@ -845,7 +844,7 @@ class ImportTest(BeetsTestCase):
 
 
 @_common.slow_test()
-class ConfigTest(unittest.TestCase, TestHelper):
+class ConfigTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()
 
@@ -1469,7 +1468,7 @@ class CompletionTest(BeetsTestCase):
         )
 
 
-class CommonOptionsParserCliTest(unittest.TestCase, TestHelper):
+class CommonOptionsParserCliTest(BeetsTestCase):
     """Test CommonOptionsParser and formatting LibModel formatting on 'list'
     command.
     """
@@ -1552,7 +1551,7 @@ class CommonOptionsParserCliTest(unittest.TestCase, TestHelper):
         # self.assertIn('plugins: ', l)
 
 
-class CommonOptionsParserTest(unittest.TestCase, TestHelper):
+class CommonOptionsParserTest(BeetsTestCase):
     def setUp(self):
         self.setup_beets()