Simplified temporary directory handling in AdminScriptTestCase.

Use tempfile.TemporaryDirectory() in AdminScriptTestCase.setUp()
to create and destroy a temporary directory for each test. It removes
the need for individual tests to delete files.

For test classes that don't use the temporary directory, inherit from
SimpleTestCase.

5 files changed, 30 insertions, 140 deletions

diff --git a/tests/admin_scripts/tests.py b/tests/admin_scripts/tests.py
index 79ff14ca4c..ecfa267d07 100644
--- a/tests/admin_scripts/tests.py
+++ b/tests/admin_scripts/tests.py
@@ -39,24 +39,14 @@ SYSTEM_CHECK_MSG = 'System check identified no issues'
 
 
 class AdminScriptTestCase(SimpleTestCase):
-
-    @classmethod
-    def setUpClass(cls):
-        super().setUpClass()
-        cls.test_dir = os.path.realpath(os.path.join(
-            tempfile.gettempdir(),
-            cls.__name__,
-            'test_project',
-        ))
-        os.makedirs(cls.test_dir)
-        with open(os.path.join(cls.test_dir, '__init__.py'), 'w'):
+    def setUp(self):
+        tmpdir = tempfile.TemporaryDirectory()
+        self.addCleanup(tmpdir.cleanup)
+        self.test_dir = os.path.join(tmpdir.name, 'test_project')
+        os.mkdir(self.test_dir)
+        with open(os.path.join(self.test_dir, '__init__.py'), 'w'):
             pass
 
-    @classmethod
-    def tearDownClass(cls):
-        shutil.rmtree(cls.test_dir)
-        super().tearDownClass()
-
     def write_settings(self, filename, apps=None, is_dir=False, sdict=None, extra=None):
         if is_dir:
             settings_dir = os.path.join(self.test_dir, filename)
@@ -90,19 +80,6 @@ class AdminScriptTestCase(SimpleTestCase):
                 for k, v in sdict.items():
                     settings_file.write("%s = %s\n" % (k, v))
 
-    def remove_settings(self, filename, is_dir=False):
-        full_name = os.path.join(self.test_dir, filename)
-        if is_dir:
-            shutil.rmtree(full_name)
-        else:
-            os.remove(full_name)
-
-        # Also remove a __pycache__ directory, if it exists; it could
-        # mess up later tests that depend upon the .py file not existing
-        cache_name = os.path.join(self.test_dir, '__pycache__')
-        if os.path.isdir(cache_name):
-            shutil.rmtree(cache_name)
-
     def _ext_backend_paths(self):
         """
         Returns the paths for any external backend packages.
@@ -151,12 +128,6 @@ class AdminScriptTestCase(SimpleTestCase):
         return self.run_test(os.path.join(script_dir, 'django-admin.py'), args, settings_file)
 
     def run_manage(self, args, settings_file=None, configured_settings=False):
-        def safe_remove(path):
-            try:
-                os.remove(path)
-            except OSError:
-                pass
-
         template_manage_py = (
             os.path.join(os.path.dirname(__file__), 'configured_settings_manage.py')
             if configured_settings else
@@ -171,7 +142,6 @@ class AdminScriptTestCase(SimpleTestCase):
             "{{ project_name }}", "test_project")
         with open(test_manage_py, 'w') as fp:
             fp.write(manage_py_contents)
-        self.addCleanup(safe_remove, test_manage_py)
 
         return self.run_test('./manage.py', args, settings_file)
 
@@ -240,11 +210,9 @@ class DjangoAdminDefaultSettings(AdminScriptTestCase):
     contains the test application.
     """
     def setUp(self):
+        super().setUp()
         self.write_settings('settings.py')
 
-    def tearDown(self):
-        self.remove_settings('settings.py')
-
     def test_builtin_command(self):
         "default: django-admin builtin commands fail with an error when no settings provided"
         args = ['check', 'admin_scripts']
@@ -308,12 +276,10 @@ class DjangoAdminFullPathDefaultSettings(AdminScriptTestCase):
     contains the test application specified using a full path.
     """
     def setUp(self):
+        super().setUp()
         self.write_settings('settings.py', ['django.contrib.auth', 'django.contrib.contenttypes',
                                             'admin_scripts', 'admin_scripts.complex_app'])
 
-    def tearDown(self):
-        self.remove_settings('settings.py')
-
     def test_builtin_command(self):
         "fulldefault: django-admin builtin commands fail with an error when no settings provided"
         args = ['check', 'admin_scripts']
@@ -377,11 +343,9 @@ class DjangoAdminMinimalSettings(AdminScriptTestCase):
     doesn't contain the test application.
     """
     def setUp(self):
+        super().setUp()
         self.write_settings('settings.py', apps=['django.contrib.auth', 'django.contrib.contenttypes'])
 
-    def tearDown(self):
-        self.remove_settings('settings.py')
-
     def test_builtin_command(self):
         "minimal: django-admin builtin commands fail with an error when no settings provided"
         args = ['check', 'admin_scripts']
@@ -445,11 +409,9 @@ class DjangoAdminAlternateSettings(AdminScriptTestCase):
     with a name other than 'settings.py'.
     """
     def setUp(self):
+        super().setUp()
         self.write_settings('alternate_settings.py')
 
-    def tearDown(self):
-        self.remove_settings('alternate_settings.py')
-
     def test_builtin_command(self):
         "alternate: django-admin builtin commands fail with an error when no settings provided"
         args = ['check', 'admin_scripts']
@@ -515,13 +477,10 @@ class DjangoAdminMultipleSettings(AdminScriptTestCase):
     alternate settings must be used by the running script.
     """
     def setUp(self):
+        super().setUp()
         self.write_settings('settings.py', apps=['django.contrib.auth', 'django.contrib.contenttypes'])
         self.write_settings('alternate_settings.py')
 
-    def tearDown(self):
-        self.remove_settings('settings.py')
-        self.remove_settings('alternate_settings.py')
-
     def test_builtin_command(self):
         "alternate: django-admin builtin commands fail with an error when no settings provided"
         args = ['check', 'admin_scripts']
@@ -586,17 +545,14 @@ class DjangoAdminSettingsDirectory(AdminScriptTestCase):
     """
 
     def setUp(self):
+        super().setUp()
         self.write_settings('settings', is_dir=True)
 
-    def tearDown(self):
-        self.remove_settings('settings', is_dir=True)
-
     def test_setup_environ(self):
         "directory: startapp creates the correct directory"
         args = ['startapp', 'settings_test']
         app_path = os.path.join(self.test_dir, 'settings_test')
         out, err = self.run_django_admin(args, 'test_project.settings')
-        self.addCleanup(shutil.rmtree, app_path)
         self.assertNoOutput(err)
         self.assertTrue(os.path.exists(app_path))
         with open(os.path.join(app_path, 'apps.py')) as f:
@@ -610,7 +566,6 @@ class DjangoAdminSettingsDirectory(AdminScriptTestCase):
         args = ['startapp', '--template', template_path, 'custom_settings_test']
         app_path = os.path.join(self.test_dir, 'custom_settings_test')
         out, err = self.run_django_admin(args, 'test_project.settings')
-        self.addCleanup(shutil.rmtree, app_path)
         self.assertNoOutput(err)
         self.assertTrue(os.path.exists(app_path))
         self.assertTrue(os.path.exists(os.path.join(app_path, 'api.py')))
@@ -620,7 +575,6 @@ class DjangoAdminSettingsDirectory(AdminScriptTestCase):
         args = ['startapp', 'こんにちは']
         app_path = os.path.join(self.test_dir, 'こんにちは')
         out, err = self.run_django_admin(args, 'test_project.settings')
-        self.addCleanup(shutil.rmtree, app_path)
         self.assertNoOutput(err)
         self.assertTrue(os.path.exists(app_path))
         with open(os.path.join(app_path, 'apps.py'), encoding='utf8') as f:
@@ -707,11 +661,9 @@ class ManageDefaultSettings(AdminScriptTestCase):
     contains the test application.
     """
     def setUp(self):
+        super().setUp()
         self.write_settings('settings.py')
 
-    def tearDown(self):
-        self.remove_settings('settings.py')
-
     def test_builtin_command(self):
         "default: manage.py builtin commands succeed when default settings are appropriate"
         args = ['check', 'admin_scripts']
@@ -774,11 +726,9 @@ class ManageFullPathDefaultSettings(AdminScriptTestCase):
     contains the test application specified using a full path.
     """
     def setUp(self):
+        super().setUp()
         self.write_settings('settings.py', ['django.contrib.auth', 'django.contrib.contenttypes', 'admin_scripts'])
 
-    def tearDown(self):
-        self.remove_settings('settings.py')
-
     def test_builtin_command(self):
         "fulldefault: manage.py builtin commands succeed when default settings are appropriate"
         args = ['check', 'admin_scripts']
@@ -841,11 +791,9 @@ class ManageMinimalSettings(AdminScriptTestCase):
     doesn't contain the test application.
     """
     def setUp(self):
+        super().setUp()
         self.write_settings('settings.py', apps=['django.contrib.auth', 'django.contrib.contenttypes'])
 
-    def tearDown(self):
-        self.remove_settings('settings.py')
-
     def test_builtin_command(self):
         "minimal: manage.py builtin commands fail with an error when no settings provided"
         args = ['check', 'admin_scripts']
@@ -908,11 +856,9 @@ class ManageAlternateSettings(AdminScriptTestCase):
     with a name other than 'settings.py'.
     """
     def setUp(self):
+        super().setUp()
         self.write_settings('alternate_settings.py')
 
-    def tearDown(self):
-        self.remove_settings('alternate_settings.py')
-
     def test_builtin_command(self):
         "alternate: manage.py builtin commands fail with an error when no default settings provided"
         args = ['check', 'admin_scripts']
@@ -999,13 +945,10 @@ class ManageMultipleSettings(AdminScriptTestCase):
     alternate settings must be used by the running script.
     """
     def setUp(self):
+        super().setUp()
         self.write_settings('settings.py', apps=['django.contrib.auth', 'django.contrib.contenttypes'])
         self.write_settings('alternate_settings.py')
 
-    def tearDown(self):
-        self.remove_settings('settings.py')
-        self.remove_settings('alternate_settings.py')
-
     def test_builtin_command(self):
         "multiple: manage.py builtin commands fail with an error when no settings provided"
         args = ['check', 'admin_scripts']
@@ -1068,9 +1011,6 @@ class ManageSettingsWithSettingsErrors(AdminScriptTestCase):
     Tests for manage.py when using the default settings.py file containing
     runtime errors.
     """
-    def tearDown(self):
-        self.remove_settings('settings.py')
-
     def write_settings_with_import_error(self, filename):
         settings_file_path = os.path.join(self.test_dir, filename)
         with open(settings_file_path, 'w') as settings_file:
@@ -1124,9 +1064,6 @@ class ManageSettingsWithSettingsErrors(AdminScriptTestCase):
 
 
 class ManageCheck(AdminScriptTestCase):
-    def tearDown(self):
-        self.remove_settings('settings.py')
-
     def test_nonexistent_app(self):
         """check reports an error on a nonexistent app in INSTALLED_APPS."""
         self.write_settings(
@@ -1274,7 +1211,7 @@ class ManageCheck(AdminScriptTestCase):
         self.assertNoOutput(out)
 
 
-class ManageRunserver(AdminScriptTestCase):
+class ManageRunserver(SimpleTestCase):
     def setUp(self):
         def monkey_run(*args, **options):
             return
@@ -1392,21 +1329,19 @@ class ManageRunserverMigrationWarning(TestCase):
 
 class ManageRunserverEmptyAllowedHosts(AdminScriptTestCase):
     def setUp(self):
+        super().setUp()
         self.write_settings('settings.py', sdict={
             'ALLOWED_HOSTS': [],
             'DEBUG': False,
         })
 
-    def tearDown(self):
-        self.remove_settings('settings.py')
-
     def test_empty_allowed_hosts_error(self):
         out, err = self.run_manage(['runserver'])
         self.assertNoOutput(out)
         self.assertOutput(err, 'CommandError: You must set settings.ALLOWED_HOSTS if DEBUG is False.')
 
 
-class ManageTestserver(AdminScriptTestCase):
+class ManageTestserver(SimpleTestCase):
 
     @mock.patch.object(TestserverCommand, 'handle', return_value='')
     def test_testserver_handle_params(self, mock_handle):
@@ -1462,11 +1397,9 @@ class ColorCommand(BaseCommand):
 class CommandTypes(AdminScriptTestCase):
     "Tests for the various types of base command types that can be defined."
     def setUp(self):
+        super().setUp()
         self.write_settings('settings.py')
 
-    def tearDown(self):
-        self.remove_settings('settings.py')
-
     def test_version(self):
         "version is handled as a special case"
         args = ['version']
@@ -1883,13 +1816,10 @@ class ArgumentOrder(AdminScriptTestCase):
     individual command.
     """
     def setUp(self):
+        super().setUp()
         self.write_settings('settings.py', apps=['django.contrib.auth', 'django.contrib.contenttypes'])
         self.write_settings('alternate_settings.py')
 
-    def tearDown(self):
-        self.remove_settings('settings.py')
-        self.remove_settings('alternate_settings.py')
-
     def test_setting_then_option(self):
         """ Options passed after settings are correctly handled. """
         args = ['base_command', 'testlabel', '--settings=alternate_settings', '--option_a=x']
@@ -1950,7 +1880,6 @@ class StartProject(LiveServerTestCase, AdminScriptTestCase):
         "Make sure the startproject management command creates a project"
         args = ['startproject', 'testproject']
         testproject_dir = os.path.join(self.test_dir, 'testproject')
-        self.addCleanup(shutil.rmtree, testproject_dir, True)
 
         out, err = self.run_django_admin(args)
         self.assertNoOutput(err)
@@ -1966,7 +1895,6 @@ class StartProject(LiveServerTestCase, AdminScriptTestCase):
         for bad_name in ('7testproject', '../testproject'):
             args = ['startproject', bad_name]
             testproject_dir = os.path.join(self.test_dir, bad_name)
-            self.addCleanup(shutil.rmtree, testproject_dir, True)
 
             out, err = self.run_django_admin(args)
             self.assertOutput(
@@ -1984,7 +1912,6 @@ class StartProject(LiveServerTestCase, AdminScriptTestCase):
         bad_name = 'os'
         args = ['startproject', bad_name]
         testproject_dir = os.path.join(self.test_dir, bad_name)
-        self.addCleanup(shutil.rmtree, testproject_dir, True)
 
         out, err = self.run_django_admin(args)
         self.assertOutput(
@@ -2000,7 +1927,6 @@ class StartProject(LiveServerTestCase, AdminScriptTestCase):
         args = ['startproject', 'testproject', 'othertestproject']
         testproject_dir = os.path.join(self.test_dir, 'othertestproject')
         os.mkdir(testproject_dir)
-        self.addCleanup(shutil.rmtree, testproject_dir)
 
         out, err = self.run_django_admin(args)
         self.assertNoOutput(err)
@@ -2016,7 +1942,6 @@ class StartProject(LiveServerTestCase, AdminScriptTestCase):
         template_path = os.path.join(custom_templates_dir, 'project_template')
         args = ['startproject', '--template', template_path, 'customtestproject']
         testproject_dir = os.path.join(self.test_dir, 'customtestproject')
-        self.addCleanup(shutil.rmtree, testproject_dir, True)
 
         out, err = self.run_django_admin(args)
         self.assertNoOutput(err)
@@ -2028,7 +1953,6 @@ class StartProject(LiveServerTestCase, AdminScriptTestCase):
         template_path = os.path.join(custom_templates_dir, 'project_template' + os.sep)
         args = ['startproject', '--template', template_path, 'customtestproject']
         testproject_dir = os.path.join(self.test_dir, 'customtestproject')
-        self.addCleanup(shutil.rmtree, testproject_dir, True)
 
         out, err = self.run_django_admin(args)
         self.assertNoOutput(err)
@@ -2040,7 +1964,6 @@ class StartProject(LiveServerTestCase, AdminScriptTestCase):
         template_path = os.path.join(custom_templates_dir, 'project_template.tgz')
         args = ['startproject', '--template', template_path, 'tarballtestproject']
         testproject_dir = os.path.join(self.test_dir, 'tarballtestproject')
-        self.addCleanup(shutil.rmtree, testproject_dir, True)
 
         out, err = self.run_django_admin(args)
         self.assertNoOutput(err)
@@ -2053,7 +1976,6 @@ class StartProject(LiveServerTestCase, AdminScriptTestCase):
         args = ['startproject', '--template', template_path, 'tarballtestproject', 'altlocation']
         testproject_dir = os.path.join(self.test_dir, 'altlocation')
         os.mkdir(testproject_dir)
-        self.addCleanup(shutil.rmtree, testproject_dir)
 
         out, err = self.run_django_admin(args)
         self.assertNoOutput(err)
@@ -2069,7 +1991,6 @@ class StartProject(LiveServerTestCase, AdminScriptTestCase):
 
         args = ['startproject', '--template', template_url, 'urltestproject']
         testproject_dir = os.path.join(self.test_dir, 'urltestproject')
-        self.addCleanup(shutil.rmtree, testproject_dir, True)
 
         out, err = self.run_django_admin(args)
         self.assertNoOutput(err)
@@ -2082,7 +2003,6 @@ class StartProject(LiveServerTestCase, AdminScriptTestCase):
 
         args = ['startproject', '--template', template_url, 'urltestproject']
         testproject_dir = os.path.join(self.test_dir, 'urltestproject')
-        self.addCleanup(shutil.rmtree, testproject_dir, True)
 
         out, err = self.run_django_admin(args)
         self.assertNoOutput(err)
@@ -2094,7 +2014,6 @@ class StartProject(LiveServerTestCase, AdminScriptTestCase):
         template_path = os.path.join(custom_templates_dir, 'project_template')
         args = ['startproject', '--template', template_path, 'customtestproject', '-e', 'txt', '-n', 'Procfile']
         testproject_dir = os.path.join(self.test_dir, 'customtestproject')
-        self.addCleanup(shutil.rmtree, testproject_dir, True)
 
         out, err = self.run_django_admin(args)
         self.assertNoOutput(err)
@@ -2112,7 +2031,6 @@ class StartProject(LiveServerTestCase, AdminScriptTestCase):
         args = ['startproject', '--template', template_path, 'another_project', 'project_dir']
         testproject_dir = os.path.join(self.test_dir, 'project_dir')
         os.mkdir(testproject_dir)
-        self.addCleanup(shutil.rmtree, testproject_dir)
         out, err = self.run_django_admin(args)
         self.assertNoOutput(err)
         test_manage_py = os.path.join(testproject_dir, 'manage.py')
@@ -2125,7 +2043,6 @@ class StartProject(LiveServerTestCase, AdminScriptTestCase):
         "Make sure template context variables are not html escaped"
         # We're using a custom command so we need the alternate settings
         self.write_settings('alternate_settings.py')
-        self.addCleanup(self.remove_settings, 'alternate_settings.py')
         template_path = os.path.join(custom_templates_dir, 'project_template')
         args = [
             'custom_startproject', '--template', template_path,
@@ -2134,7 +2051,6 @@ class StartProject(LiveServerTestCase, AdminScriptTestCase):
         ]
         testproject_dir = os.path.join(self.test_dir, 'project_dir')
         os.mkdir(testproject_dir)
-        self.addCleanup(shutil.rmtree, testproject_dir)
         out, err = self.run_manage(args)
         self.assertNoOutput(err)
         test_manage_py = os.path.join(testproject_dir, 'additional_dir', 'extra.py')
@@ -2163,7 +2079,6 @@ class StartProject(LiveServerTestCase, AdminScriptTestCase):
         template_path = os.path.join(custom_templates_dir, 'project_template')
         args = ['startproject', '--template', template_path, '--extension=txt', 'customtestproject']
         testproject_dir = os.path.join(self.test_dir, 'customtestproject')
-        self.addCleanup(shutil.rmtree, testproject_dir, True)
 
         out, err = self.run_django_admin(args)
         self.assertNoOutput(err)
@@ -2182,7 +2097,6 @@ class StartApp(AdminScriptTestCase):
         for bad_name in ('7testproject', '../testproject'):
             args = ['startapp', bad_name]
             testproject_dir = os.path.join(self.test_dir, bad_name)
-            self.addCleanup(shutil.rmtree, testproject_dir, True)
 
             out, err = self.run_django_admin(args)
             self.assertOutput(
@@ -2200,7 +2114,6 @@ class StartApp(AdminScriptTestCase):
         bad_name = 'os'
         args = ['startapp', bad_name]
         testproject_dir = os.path.join(self.test_dir, bad_name)
-        self.addCleanup(shutil.rmtree, testproject_dir, True)
 
         out, err = self.run_django_admin(args)
         self.assertOutput(
@@ -2218,7 +2131,6 @@ class DiffSettings(AdminScriptTestCase):
     def test_basic(self):
         """Runs without error and emits settings diff."""
         self.write_settings('settings_to_diff.py', sdict={'FOO': '"bar"'})
-        self.addCleanup(self.remove_settings, 'settings_to_diff.py')
         args = ['diffsettings', '--settings=settings_to_diff']
         out, err = self.run_manage(args)
         self.assertNoOutput(err)
@@ -2232,7 +2144,6 @@ class DiffSettings(AdminScriptTestCase):
     def test_all(self):
         """The all option also shows settings with the default value."""
         self.write_settings('settings_to_diff.py', sdict={'STATIC_URL': 'None'})
-        self.addCleanup(self.remove_settings, 'settings_to_diff.py')
         args = ['diffsettings', '--settings=settings_to_diff', '--all']
         out, err = self.run_manage(args)
         self.assertNoOutput(err)
@@ -2244,9 +2155,7 @@ class DiffSettings(AdminScriptTestCase):
         comparison.
         """
         self.write_settings('settings_default.py', sdict={'FOO': '"foo"', 'BAR': '"bar1"'})
-        self.addCleanup(self.remove_settings, 'settings_default.py')
         self.write_settings('settings_to_diff.py', sdict={'FOO': '"foo"', 'BAR': '"bar2"'})
-        self.addCleanup(self.remove_settings, 'settings_to_diff.py')
         out, err = self.run_manage(['diffsettings', '--settings=settings_to_diff', '--default=settings_default'])
         self.assertNoOutput(err)
         self.assertNotInOutput(out, "FOO")
@@ -2255,7 +2164,6 @@ class DiffSettings(AdminScriptTestCase):
     def test_unified(self):
         """--output=unified emits settings diff in unified mode."""
         self.write_settings('settings_to_diff.py', sdict={'FOO': '"bar"'})
-        self.addCleanup(self.remove_settings, 'settings_to_diff.py')
         args = ['diffsettings', '--settings=settings_to_diff', '--output=unified']
         out, err = self.run_manage(args)
         self.assertNoOutput(err)
@@ -2270,7 +2178,6 @@ class DiffSettings(AdminScriptTestCase):
         settings with the default value.
         """
         self.write_settings('settings_to_diff.py', sdict={'FOO': '"bar"'})
-        self.addCleanup(self.remove_settings, 'settings_to_diff.py')
         args = ['diffsettings', '--settings=settings_to_diff', '--output=unified', '--all']
         out, err = self.run_manage(args)
         self.assertNoOutput(err)
@@ -2283,11 +2190,9 @@ class Dumpdata(AdminScriptTestCase):
     """Tests for dumpdata management command."""
 
     def setUp(self):
+        super().setUp()
         self.write_settings('settings.py')
 
-    def tearDown(self):
-        self.remove_settings('settings.py')
-
     def test_pks_parsing(self):
         """Regression for #20509
 
@@ -2314,11 +2219,9 @@ class MainModule(AdminScriptTestCase):
 
 class DjangoAdminSuggestions(AdminScriptTestCase):
     def setUp(self):
+        super().setUp()
         self.write_settings('settings.py')
 
-    def tearDown(self):
-        self.remove_settings('settings.py')
-
     def test_suggestions(self):
         args = ['rnserver', '--settings=test_project.settings']
         out, err = self.run_django_admin(args)
diff --git a/tests/logging_tests/tests.py b/tests/logging_tests/tests.py
index 3ab905eab6..c19bfd7559 100644
--- a/tests/logging_tests/tests.py
+++ b/tests/logging_tests/tests.py
@@ -439,6 +439,7 @@ class SettingsConfigTest(AdminScriptTestCase):
     a circular import error.
     """
     def setUp(self):
+        super().setUp()
         log_config = """{
     'version': 1,
     'handlers': {
@@ -450,9 +451,6 @@ class SettingsConfigTest(AdminScriptTestCase):
 }"""
         self.write_settings('settings.py', sdict={'LOGGING': log_config})
 
-    def tearDown(self):
-        self.remove_settings('settings.py')
-
     def test_circular_dependency(self):
         # validate is just an example command to trigger settings configuration
         out, err = self.run_manage(['check'])
@@ -518,6 +516,7 @@ class SettingsCustomLoggingTest(AdminScriptTestCase):
     callable in LOGGING_CONFIG (i.e., logging.config.fileConfig).
     """
     def setUp(self):
+        super().setUp()
         logging_conf = """
 [loggers]
 keys=root
@@ -544,7 +543,6 @@ format=%(message)s
 
     def tearDown(self):
         self.temp_file.close()
-        self.remove_settings('settings.py')
 
     def test_custom_logging(self):
         out, err = self.run_manage(['check'])
diff --git a/tests/test_runner/tests.py b/tests/test_runner/tests.py
index 43c605eba6..3f4e257261 100644
--- a/tests/test_runner/tests.py
+++ b/tests/test_runner/tests.py
@@ -155,14 +155,12 @@ class CustomTestRunnerOptionsSettingsTests(AdminScriptTestCase):
     through a settings file.
     """
     def setUp(self):
+        super().setUp()
         settings = {
             'TEST_RUNNER': '\'test_runner.runner.CustomOptionsTestRunner\'',
         }
         self.write_settings('settings.py', sdict=settings)
 
-    def tearDown(self):
-        self.remove_settings('settings.py')
-
     def test_default_options(self):
         args = ['test', '--settings=test_project.settings']
         out, err = self.run_django_admin(args)
@@ -195,11 +193,9 @@ class CustomTestRunnerOptionsCmdlineTests(AdminScriptTestCase):
     using --testrunner.
     """
     def setUp(self):
+        super().setUp()
         self.write_settings('settings.py')
 
-    def tearDown(self):
-        self.remove_settings('settings.py')
-
     def test_testrunner_option(self):
         args = [
             'test', '--testrunner', 'test_runner.runner.CustomOptionsTestRunner',
@@ -228,11 +224,9 @@ class CustomTestRunnerOptionsCmdlineTests(AdminScriptTestCase):
 
 class Ticket17477RegressionTests(AdminScriptTestCase):
     def setUp(self):
+        super().setUp()
         self.write_settings('settings.py')
 
-    def tearDown(self):
-        self.remove_settings('settings.py')
-
     def test_ticket_17477(self):
         """'manage.py help test' works after r16352."""
         args = ['help', 'test']
diff --git a/tests/urlpatterns_reverse/tests.py b/tests/urlpatterns_reverse/tests.py
index f902cffdac..77745976af 100644
--- a/tests/urlpatterns_reverse/tests.py
+++ b/tests/urlpatterns_reverse/tests.py
@@ -534,14 +534,12 @@ class ReverseLazySettingsTest(AdminScriptTestCase):
     import error.
     """
     def setUp(self):
+        super().setUp()
         self.write_settings(
             'settings.py',
             extra="from django.urls import reverse_lazy\nLOGIN_URL = reverse_lazy('login')",
         )
 
-    def tearDown(self):
-        self.remove_settings('settings.py')
-
     def test_lazy_in_settings(self):
         out, err = self.run_manage(['check'])
         self.assertNoOutput(err)
diff --git a/tests/user_commands/tests.py b/tests/user_commands/tests.py
index 25ab82baed..2d1f8f834d 100644
--- a/tests/user_commands/tests.py
+++ b/tests/user_commands/tests.py
@@ -234,9 +234,6 @@ class CommandRunTests(AdminScriptTestCase):
     """
     Tests that need to run by simulating the command line, not by call_command.
     """
-    def tearDown(self):
-        self.remove_settings('settings.py')
-
     def test_script_prefix_set_in_commands(self):
         self.write_settings('settings.py', apps=['user_commands'], sdict={
             'ROOT_URLCONF': '"user_commands.urls"',