diff --git a/beets/test/_common.py b/beets/test/_common.py
index 0d2d51f1e..ca1671cb7 100644
--- a/beets/test/_common.py
+++ b/beets/test/_common.py
@@ -18,7 +18,6 @@ import os
 import sys
 import unittest
 from contextlib import contextmanager
-from pathlib import Path
 
 import beets
 import beets.library
@@ -115,11 +114,6 @@ def import_session(lib=None, loghandler=None, paths=[], query=[], cli=False):
 class Assertions:
     """A mixin with additional unit test assertions."""
 
-    def assertIsDir(self, path):
-        path = Path(os.fsdecode(path))
-        assert path.exists()
-        assert path.is_dir()
-
     def assert_equal_path(self, a, b):
         """Check that two paths are equal."""
         a_bytes, b_bytes = util.normpath(a), util.normpath(b)
diff --git a/test/test_files.py b/test/test_files.py
index 266e4f4d0..8b08a3fab 100644
--- a/test/test_files.py
+++ b/test/test_files.py
@@ -671,12 +671,9 @@ class UniquePathTest(BeetsTestCase):
 
 
 class MkDirAllTest(BeetsTestCase):
-    def test_parent_exists(self):
-        path = self.temp_dir_path / "foo" / "bar" / "baz" / "qux.mp3"
-        util.mkdirall(path)
-        self.assertIsDir(self.temp_dir_path / "foo" / "bar" / "baz")
-
-    def test_child_does_not_exist(self):
-        path = self.temp_dir_path / "foo" / "bar" / "baz" / "qux.mp3"
-        util.mkdirall(path)
-        assert not path.exists()
+    def test_mkdirall(self):
+        child = self.temp_dir_path / "foo" / "bar" / "baz" / "quz.mp3"
+        util.mkdirall(child)
+        assert not child.exists()
+        assert child.parent.exists()
+        assert child.parent.is_dir()
diff --git a/test/test_importer.py b/test/test_importer.py
index 521f98f99..a072d43d4 100644
--- a/test/test_importer.py
+++ b/test/test_importer.py
@@ -411,7 +411,7 @@ class ImportTest(PathsMixin, AutotagImportTestCase):
         assert not self.lib.items()
 
     def test_skip_non_album_dirs(self):
-        self.assertIsDir(os.path.join(self.import_dir, b"album"))
+        assert (self.import_path / "album").exists()
         self.touch(b"cruft", dir=self.import_dir)
         self.importer.add_choice(importer.Action.APPLY)
         self.importer.run()