diff --git a/Lib/importlib/test/builtin/test_finder.py b/Lib/importlib/test/builtin/test_finder.py
index 1f6274c0230..146538d891d 100644
--- a/Lib/importlib/test/builtin/test_finder.py
+++ b/Lib/importlib/test/builtin/test_finder.py
@@ -35,14 +35,14 @@ class FinderTests(abc.FinderTests):
     def test_failure(self):
         assert 'importlib' not in sys.builtin_module_names
         loader = machinery.BuiltinImporter.find_module('importlib')
-        self.assertIs(loader, None)
+        self.assertIsNone(loader)
 
     def test_ignore_path(self):
         # The value for 'path' should always trigger a failed import.
         with util.uncache(builtin_util.NAME):
             loader = machinery.BuiltinImporter.find_module(builtin_util.NAME,
                                                             ['pkg'])
-            self.assertIs(loader, None)
+            self.assertIsNone(loader)
 
 
 
diff --git a/Lib/importlib/test/builtin/test_loader.py b/Lib/importlib/test/builtin/test_loader.py
index 357ec2621e2..8e186e71560 100644
--- a/Lib/importlib/test/builtin/test_loader.py
+++ b/Lib/importlib/test/builtin/test_loader.py
@@ -74,12 +74,12 @@ class InspectLoaderTests(unittest.TestCase):
     def test_get_code(self):
         # There is no code object.
         result = machinery.BuiltinImporter.get_code(builtin_util.NAME)
-        self.assertIs(result, None)
+        self.assertIsNone(result)
 
     def test_get_source(self):
         # There is no source.
         result = machinery.BuiltinImporter.get_source(builtin_util.NAME)
-        self.assertIs(result, None)
+        self.assertIsNone(result)
 
     def test_is_package(self):
         # Cannot be a package.
diff --git a/Lib/importlib/test/extension/test_finder.py b/Lib/importlib/test/extension/test_finder.py
index ef84884e027..1c6029291f2 100644
--- a/Lib/importlib/test/extension/test_finder.py
+++ b/Lib/importlib/test/extension/test_finder.py
@@ -36,7 +36,7 @@ class FinderTests(abc.FinderTests):
         pass
 
     def test_failure(self):
-        self.assertIs(self.find_module('asdfjkl;'), None)
+        self.assertIsNone(self.find_module('asdfjkl;'))
 
     # XXX Raise an exception if someone tries to use the 'path' argument?
 
diff --git a/Lib/importlib/test/frozen/test_finder.py b/Lib/importlib/test/frozen/test_finder.py
index a51d939ccc1..54c0c9072fd 100644
--- a/Lib/importlib/test/frozen/test_finder.py
+++ b/Lib/importlib/test/frozen/test_finder.py
@@ -35,7 +35,7 @@ class FinderTests(abc.FinderTests):
 
     def test_failure(self):
         loader = self.find('<not real>')
-        self.assertIs(loader, None)
+        self.assertIsNone(loader)
 
 
 def test_main():
diff --git a/Lib/importlib/test/frozen/test_loader.py b/Lib/importlib/test/frozen/test_loader.py
index 87a479a63d1..4b8ec155543 100644
--- a/Lib/importlib/test/frozen/test_loader.py
+++ b/Lib/importlib/test/frozen/test_loader.py
@@ -93,7 +93,7 @@ class InspectLoaderTests(unittest.TestCase):
     def test_get_source(self):
         # Should always return None.
         result = machinery.FrozenImporter.get_source('__hello__')
-        self.assertIs(result, None)
+        self.assertIsNone(result)
 
     def test_is_package(self):
         # Should be able to tell what is a package.
diff --git a/Lib/importlib/test/import_/test_meta_path.py b/Lib/importlib/test/import_/test_meta_path.py
index 7f6d6dae01c..4d85f80e673 100644
--- a/Lib/importlib/test/import_/test_meta_path.py
+++ b/Lib/importlib/test/import_/test_meta_path.py
@@ -82,7 +82,7 @@ class CallSignature(unittest.TestCase):
                 self.assertEqual(len(args), 2)
                 self.assertEqual(len(kwargs), 0)
                 self.assertEqual(args[0], mod_name)
-                self.assertIs(args[1], None)
+                self.assertIsNone(args[1])
 
     def test_with_path(self):
         # [path set]
diff --git a/Lib/importlib/test/import_/test_path.py b/Lib/importlib/test/import_/test_path.py
index b8aeab12a9e..0c086ce147a 100644
--- a/Lib/importlib/test/import_/test_path.py
+++ b/Lib/importlib/test/import_/test_path.py
@@ -20,7 +20,7 @@ class FinderTests(unittest.TestCase):
         # Test None returned upon not finding a suitable finder.
         module = '<test module>'
         with util.import_state():
-            self.assertIs(machinery.PathFinder.find_module(module), None)
+            self.assertIsNone(machinery.PathFinder.find_module(module))
 
     def test_sys_path(self):
         # Test that sys.path is used when 'path' is None.
diff --git a/Lib/importlib/test/source/test_finder.py b/Lib/importlib/test/source/test_finder.py
index e1ef9387fd5..fa5d3567b58 100644
--- a/Lib/importlib/test/source/test_finder.py
+++ b/Lib/importlib/test/source/test_finder.py
@@ -115,7 +115,7 @@ class FinderTests(abc.FinderTests):
     def test_failure(self):
         with source_util.create_modules('blah') as mapping:
             nothing = self.import_(mapping['.root'], 'sdfsadsadf')
-            self.assertIs(nothing, None)
+            self.assertIsNone(nothing)
 
     def test_empty_string_for_dir(self):
         # The empty string from sys.path means to search in the cwd.
diff --git a/Lib/importlib/test/test_locks.py b/Lib/importlib/test/test_locks.py
index 7faff490ae5..d36b71eb18e 100644
--- a/Lib/importlib/test/test_locks.py
+++ b/Lib/importlib/test/test_locks.py
@@ -97,7 +97,7 @@ class LifetimeTests(unittest.TestCase):
         del lock
         support.gc_collect()
         self.assertNotIn(name, _bootstrap._module_locks)
-        self.assertIs(wr(), None)
+        self.assertIsNone(wr())
 
     def test_all_locks(self):
         support.gc_collect()