Use os_helper.temp_dir() in DirCmpImplementationTests setUp

Author: Bolotnyj

Lib/test/test_filecmp.py

@@ -389,10 +389,12 @@ def _assert_report(self, dircmp_report, expected_report_lines):
 
 class DirCmpImplementationTests(unittest.TestCase):
     def setUp(self):
-        tmpdir = tempfile.gettempdir()
+        cm = os_helper.temp_dir()
+        tmpdir = cm.__enter__()
+        self.addCleanup(cm.__exit__, None, None, None)
+
         self.base_test_dir = os.path.join(tmpdir, 'test_filecmp_working_dir')
         os.makedirs(self.base_test_dir, exist_ok=True)
-        self.addCleanup(shutil.rmtree, self.base_test_dir, ignore_errors=True)
 
         self.dir = os.path.join(self.base_test_dir, 'dir')
         self.dir_same = os.path.join(self.base_test_dir, 'dir-same')