1 files changed, 9 insertions, 1 deletions
diff --git a/Lib/test/test_base64.py b/Lib/test/test_base64.py
index 409c8c109e8..ce2e3e3726f 100644
--- a/Lib/test/test_base64.py
+++ b/Lib/test/test_base64.py
@@ -3,8 +3,16 @@ import base64
 import binascii
 import os
 from array import array
+from test.support import cpython_only
 from test.support import os_helper
 from test.support import script_helper
+from test.support.import_helper import ensure_lazy_imports
+
+
+class LazyImportTest(unittest.TestCase):
+    @cpython_only
+    def test_lazy_import(self):
+        ensure_lazy_imports("base64", {"re", "getopt"})
 
 
 class LegacyBase64TestCase(unittest.TestCase):
@@ -804,7 +812,7 @@ class BaseXYTestCase(unittest.TestCase):
             self.assertRaises(ValueError, f, 'with non-ascii \xcb')
 
     def test_ErrorHeritage(self):
-        self.assertTrue(issubclass(binascii.Error, ValueError))
+        self.assertIsSubclass(binascii.Error, ValueError)
 
     def test_RFC4648_test_cases(self):
         # test cases from RFC 4648 section 10