diff --git a/Lib/test/test_genericpath.py b/Lib/test/test_genericpath.py
index 50638a1..b618d45 100644
--- a/Lib/test/test_genericpath.py
+++ b/Lib/test/test_genericpath.py
@@ -2,11 +2,12 @@
 Tests common to genericpath, macpath, ntpath and posixpath
 """
 
-import unittest
-from test import support
-import os
 import genericpath
+import os
 import sys
+import unittest
+import warnings
+from test import support
 
 
 def safe_rmdir(dirname):
@@ -258,7 +259,9 @@
 
     def test_abspath(self):
         self.assertIn("foo", self.pathmodule.abspath("foo"))
-        self.assertIn(b"foo", self.pathmodule.abspath(b"foo"))
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore", DeprecationWarning)
+            self.assertIn(b"foo", self.pathmodule.abspath(b"foo"))
 
         # Abspath returns bytes when the arg is bytes
         for path in (b'', b'foo', b'f\xf2\xf2', b'/foo', b'C:\\'):
@@ -266,7 +269,9 @@
 
     def test_realpath(self):
         self.assertIn("foo", self.pathmodule.realpath("foo"))
-        self.assertIn(b"foo", self.pathmodule.realpath(b"foo"))
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore", DeprecationWarning)
+            self.assertIn(b"foo", self.pathmodule.realpath(b"foo"))
 
     def test_normpath_issue5827(self):
         # Make sure normpath preserves unicode
@@ -296,8 +301,10 @@
         "Mac OS X denies the creation of a directory with an invalid utf8 name")
     def test_nonascii_abspath(self):
         # Test non-ASCII, non-UTF8 bytes in the path.
-        with support.temp_cwd(b'\xe7w\xf0'):
-            self.test_abspath()
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore", DeprecationWarning)
+            with support.temp_cwd(b'\xe7w\xf0'):
+                self.test_abspath()
 
 
 def test_main():
diff --git a/Lib/test/test_ntpath.py b/Lib/test/test_ntpath.py
index 6464950..2c9dab9 100644
--- a/Lib/test/test_ntpath.py
+++ b/Lib/test/test_ntpath.py
@@ -1,10 +1,11 @@
 import ntpath
 import os
 import sys
+import unittest
+import warnings
 from test.support import TestFailed
 from test import support, test_genericpath
 from tempfile import TemporaryFile
-import unittest
 
 
 def tester(fn, wantResult):
@@ -21,7 +22,9 @@
     fn = fn.replace('["', '[b"')
     fn = fn.replace(", '", ", b'")
     fn = fn.replace(', "', ', b"')
-    gotResult = eval(fn)
+    with warnings.catch_warnings():
+        warnings.simplefilter("ignore", DeprecationWarning)
+        gotResult = eval(fn)
     if isinstance(wantResult, str):
         wantResult = wantResult.encode('ascii')
     elif isinstance(wantResult, tuple):
diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py
index da143cf..ec2877e 100644
--- a/Lib/test/test_os.py
+++ b/Lib/test/test_os.py
@@ -213,7 +213,9 @@
             fname = self.fname.encode(sys.getfilesystemencoding())
         except UnicodeEncodeError:
             self.skipTest("cannot encode %a for the filesystem" % self.fname)
-        self.check_stat_attributes(fname)
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore", DeprecationWarning)
+            self.check_stat_attributes(fname)
 
     def test_statvfs_attributes(self):
         if not hasattr(os, "statvfs"):
@@ -838,7 +840,9 @@
         with open(file1, "w") as f1:
             f1.write("test")
 
-        os.link(file1, file2)
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore", DeprecationWarning)
+            os.link(file1, file2)
         with open(file1, "r") as f1, open(file2, "r") as f2:
             self.assertTrue(os.path.sameopenfile(f1.fileno(), f2.fileno()))
 
@@ -1160,8 +1164,10 @@
         self.assertNotEqual(os.lstat(link), os.stat(link))
 
         bytes_link = os.fsencode(link)
-        self.assertEqual(os.stat(bytes_link), os.stat(target))
-        self.assertNotEqual(os.lstat(bytes_link), os.stat(bytes_link))
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore", DeprecationWarning)
+            self.assertEqual(os.stat(bytes_link), os.stat(target))
+            self.assertNotEqual(os.lstat(bytes_link), os.stat(bytes_link))
 
     def test_12084(self):
         level1 = os.path.abspath(support.TESTFN)
@@ -1619,6 +1625,35 @@
         self._check_xattrs(getxattr, setxattr, removexattr, listxattr)
 
 
+@unittest.skipUnless(sys.platform == "win32", "Win32 specific tests")
+class Win32DeprecatedBytesAPI(unittest.TestCase):
+    def test_deprecated(self):
+        import nt
+        filename = os.fsencode(support.TESTFN)
+        with warnings.catch_warnings():
+            warnings.simplefilter("error", DeprecationWarning)
+            for func, *args in (
+                (nt._getfullpathname, filename),
+                (nt._isdir, filename),
+                (os.access, filename, os.R_OK),
+                (os.chdir, filename),
+                (os.chmod, filename, 0o777),
+                (os.link, filename, filename),
+                (os.listdir, filename),
+                (os.lstat, filename),
+                (os.mkdir, filename),
+                (os.open, filename, os.O_RDONLY),
+                (os.rename, filename, filename),
+                (os.rmdir, filename),
+                (os.startfile, filename),
+                (os.stat, filename),
+                (os.symlink, filename, filename),
+                (os.unlink, filename),
+                (os.utime, filename),
+            ):
+                self.assertRaises(DeprecationWarning, func, *args)
+
+
 @support.reap_threads
 def test_main():
     support.run_unittest(
@@ -1643,6 +1678,7 @@
         TestSendfile,
         ProgramPriorityTests,
         ExtendedAttributeTests,
+        Win32DeprecatedBytesAPI,
     )
 
 if __name__ == "__main__":
diff --git a/Lib/test/test_pep277.py b/Lib/test/test_pep277.py
index a1a4791..4b16cbb 100644
--- a/Lib/test/test_pep277.py
+++ b/Lib/test/test_pep277.py
@@ -1,6 +1,9 @@
 # Test the Unicode versions of normal file functions
 # open, os.open, os.stat. os.listdir, os.rename, os.remove, os.mkdir, os.chdir, os.rmdir
-import sys, os, unittest
+import os
+import sys
+import unittest
+import warnings
 from unicodedata import normalize
 from test import support
 
@@ -155,7 +158,9 @@
     @unittest.skipIf(sys.platform == 'darwin', 'irrelevant test on Mac OS X')
     def test_listdir(self):
         sf0 = set(self.files)
-        f1 = os.listdir(support.TESTFN.encode(sys.getfilesystemencoding()))
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore", DeprecationWarning)
+            f1 = os.listdir(support.TESTFN.encode(sys.getfilesystemencoding()))
         f2 = os.listdir(support.TESTFN)
         sf2 = set(os.path.join(support.TESTFN, f) for f in f2)
         self.assertEqual(sf0, sf2, "%a != %a" % (sf0, sf2))
diff --git a/Lib/test/test_posixpath.py b/Lib/test/test_posixpath.py
index bb4559c..709ef04 100644
--- a/Lib/test/test_posixpath.py
+++ b/Lib/test/test_posixpath.py
@@ -1,10 +1,10 @@
-import unittest
-from test import support, test_genericpath
-
-import posixpath
 import os
+import posixpath
 import sys
+import unittest
+import warnings
 from posixpath import realpath, abspath, dirname, basename
+from test import support, test_genericpath
 
 try:
     import posix
@@ -231,7 +231,9 @@
 
     def test_ismount(self):
         self.assertIs(posixpath.ismount("/"), True)
-        self.assertIs(posixpath.ismount(b"/"), True)
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore", DeprecationWarning)
+            self.assertIs(posixpath.ismount(b"/"), True)
 
     def test_ismount_non_existent(self):
         # Non-existent mountpoint.