bpo-33755: Fix importlib.resources isolation tests (#7412)

Lib/test/test_importlib/test_resource.py

@@ -2,7 +2,7 @@ import sys
 import unittest
 
 from . import data01
-from . import zipdata02
+from . import zipdata01, zipdata02
 from . import util
 from importlib import resources, import_module
 
@@ -109,6 +109,10 @@ class ResourceFromZipsTest(util.ZipSetupBase, unittest.TestCase):
             set(resources.contents('ziptestdata.two')),
             {'__init__.py', 'resource2.txt'})
 
+
+class SubdirectoryResourceFromZipsTest(util.ZipSetupBase, unittest.TestCase):
+    ZIP_MODULE = zipdata01                          # type: ignore
+
     def test_is_submodule_resource(self):
         submodule = import_module('ziptestdata.subdirectory')
         self.assertTrue(

Lib/test/test_importlib/util.py

@@ -549,6 +549,10 @@ class ZipSetupBase:
         except AttributeError:
             pass
 
+    def setUp(self):
+        modules = support.modules_setup()
+        self.addCleanup(support.modules_cleanup, *modules)
+
 
 class ZipSetup(ZipSetupBase):
     ZIP_MODULE = zipdata01                          # type: ignore