diff --git a/Lib/test/test_base64.py b/Lib/test/test_base64.py
index f9f75f0..a7fa2b9 100644
--- a/Lib/test/test_base64.py
+++ b/Lib/test/test_base64.py
@@ -2,36 +2,191 @@
 from test import test_support
 import base64
 
-class Base64TestCase(unittest.TestCase):
 
+
+class LegacyBase64TestCase(unittest.TestCase):
     def test_encodestring(self):
-        self.assertEqual(base64.encodestring("www.python.org"), "d3d3LnB5dGhvbi5vcmc=\n")
-        self.assertEqual(base64.encodestring("a"), "YQ==\n")
-        self.assertEqual(base64.encodestring("ab"), "YWI=\n")
-        self.assertEqual(base64.encodestring("abc"), "YWJj\n")
-        self.assertEqual(base64.encodestring(""), "")
-        self.assertEqual(base64.encodestring("abcdefghijklmnopqrstuvwxyz"
-                           "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
-                           "0123456789!@#0^&*();:<>,. []{}"),
-              "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXpBQkNE"
-              "RUZHSElKS0xNTk9QUVJTVFVWV1hZWjAxMjM0\nNT"
-              "Y3ODkhQCMwXiYqKCk7Ojw+LC4gW117fQ==\n")
+        eq = self.assertEqual
+        eq(base64.encodestring("www.python.org"), "d3d3LnB5dGhvbi5vcmc=\n")
+        eq(base64.encodestring("a"), "YQ==\n")
+        eq(base64.encodestring("ab"), "YWI=\n")
+        eq(base64.encodestring("abc"), "YWJj\n")
+        eq(base64.encodestring(""), "")
+        eq(base64.encodestring("abcdefghijklmnopqrstuvwxyz"
+                               "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+                               "0123456789!@#0^&*();:<>,. []{}"),
+           "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXpBQkNE"
+           "RUZHSElKS0xNTk9QUVJTVFVWV1hZWjAxMjM0\nNT"
+           "Y3ODkhQCMwXiYqKCk7Ojw+LC4gW117fQ==\n")
 
     def test_decodestring(self):
-        self.assertEqual(base64.decodestring("d3d3LnB5dGhvbi5vcmc=\n"), "www.python.org")
-        self.assertEqual(base64.decodestring("YQ==\n"), "a")
-        self.assertEqual(base64.decodestring("YWI=\n"), "ab")
-        self.assertEqual(base64.decodestring("YWJj\n"), "abc")
-        self.assertEqual(base64.decodestring("YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXpBQkNE"
-                           "RUZHSElKS0xNTk9QUVJTVFVWV1hZWjAxMjM0\nNT"
-                           "Y3ODkhQCMwXiYqKCk7Ojw+LC4gW117fQ==\n"),
-              "abcdefghijklmnopqrstuvwxyz"
-              "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
-              "0123456789!@#0^&*();:<>,. []{}")
-        self.assertEqual(base64.decodestring(''), '')
+        eq = self.assertEqual
+        eq(base64.decodestring("d3d3LnB5dGhvbi5vcmc=\n"), "www.python.org")
+        eq(base64.decodestring("YQ==\n"), "a")
+        eq(base64.decodestring("YWI=\n"), "ab")
+        eq(base64.decodestring("YWJj\n"), "abc")
+        eq(base64.decodestring("YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXpBQkNE"
+                               "RUZHSElKS0xNTk9QUVJTVFVWV1hZWjAxMjM0\nNT"
+                               "Y3ODkhQCMwXiYqKCk7Ojw+LC4gW117fQ==\n"),
+           "abcdefghijklmnopqrstuvwxyz"
+           "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+           "0123456789!@#0^&*();:<>,. []{}")
+        eq(base64.decodestring(''), '')
+
+    def test_encode(self):
+        eq = self.assertEqual
+        from cStringIO import StringIO
+        infp = StringIO('abcdefghijklmnopqrstuvwxyz'
+                        'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
+                        '0123456789!@#0^&*();:<>,. []{}')
+        outfp = StringIO()
+        base64.encode(infp, outfp)
+        eq(outfp.getvalue(),
+           'YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXpBQkNE'
+           'RUZHSElKS0xNTk9QUVJTVFVWV1hZWjAxMjM0\nNT'
+           'Y3ODkhQCMwXiYqKCk7Ojw+LC4gW117fQ==\n')
+
+    def test_decode(self):
+        from cStringIO import StringIO
+        infp = StringIO('d3d3LnB5dGhvbi5vcmc=')
+        outfp = StringIO()
+        base64.decode(infp, outfp)
+        self.assertEqual(outfp.getvalue(), 'www.python.org')
+
+
+
+class BaseXYTestCase(unittest.TestCase):
+    def test_b64encode(self):
+        eq = self.assertEqual
+        # Test default alphabet
+        eq(base64.b64encode("www.python.org"), "d3d3LnB5dGhvbi5vcmc=")
+        eq(base64.b64encode("a"), "YQ==")
+        eq(base64.b64encode("ab"), "YWI=")
+        eq(base64.b64encode("abc"), "YWJj")
+        eq(base64.b64encode(""), "")
+        eq(base64.b64encode("abcdefghijklmnopqrstuvwxyz"
+                            "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+                            "0123456789!@#0^&*();:<>,. []{}"),
+           "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXpBQkNE"
+           "RUZHSElKS0xNTk9QUVJTVFVWV1hZWjAxMjM0NT"
+           "Y3ODkhQCMwXiYqKCk7Ojw+LC4gW117fQ==")
+        # Test with arbitrary alternative characters
+        eq(base64.b64encode('\xd3V\xbeo\xf7\x1d', altchars='*$'), '01a*b$cd')
+        # Test standard alphabet
+        eq(base64.standard_b64encode("www.python.org"), "d3d3LnB5dGhvbi5vcmc=")
+        eq(base64.standard_b64encode("a"), "YQ==")
+        eq(base64.standard_b64encode("ab"), "YWI=")
+        eq(base64.standard_b64encode("abc"), "YWJj")
+        eq(base64.standard_b64encode(""), "")
+        eq(base64.standard_b64encode("abcdefghijklmnopqrstuvwxyz"
+                                     "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+                                     "0123456789!@#0^&*();:<>,. []{}"),
+           "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXpBQkNE"
+           "RUZHSElKS0xNTk9QUVJTVFVWV1hZWjAxMjM0NT"
+           "Y3ODkhQCMwXiYqKCk7Ojw+LC4gW117fQ==")
+        # Test with 'URL safe' alternative characters
+        eq(base64.urlsafe_b64encode('\xd3V\xbeo\xf7\x1d'), '01a-b_cd')
+
+    def test_b64decode(self):
+        eq = self.assertEqual
+        eq(base64.b64decode("d3d3LnB5dGhvbi5vcmc="), "www.python.org")
+        eq(base64.b64decode("YQ=="), "a")
+        eq(base64.b64decode("YWI="), "ab")
+        eq(base64.b64decode("YWJj"), "abc")
+        eq(base64.b64decode("YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXpBQkNE"
+                            "RUZHSElKS0xNTk9QUVJTVFVWV1hZWjAxMjM0\nNT"
+                            "Y3ODkhQCMwXiYqKCk7Ojw+LC4gW117fQ=="),
+           "abcdefghijklmnopqrstuvwxyz"
+           "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+           "0123456789!@#0^&*();:<>,. []{}")
+        eq(base64.b64decode(''), '')
+        # Test with arbitrary alternative characters
+        eq(base64.b64decode('01a*b$cd', altchars='*$'), '\xd3V\xbeo\xf7\x1d')
+        # Test standard alphabet
+        eq(base64.standard_b64decode("d3d3LnB5dGhvbi5vcmc="), "www.python.org")
+        eq(base64.standard_b64decode("YQ=="), "a")
+        eq(base64.standard_b64decode("YWI="), "ab")
+        eq(base64.standard_b64decode("YWJj"), "abc")
+        eq(base64.standard_b64decode(""), "")
+        eq(base64.standard_b64decode("YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXpBQkNE"
+                                     "RUZHSElKS0xNTk9QUVJTVFVWV1hZWjAxMjM0NT"
+                                     "Y3ODkhQCMwXiYqKCk7Ojw+LC4gW117fQ=="),
+           "abcdefghijklmnopqrstuvwxyz"
+           "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+           "0123456789!@#0^&*();:<>,. []{}")
+        # Test with 'URL safe' alternative characters
+        eq(base64.urlsafe_b64decode('01a-b_cd'), '\xd3V\xbeo\xf7\x1d')
+
+    def test_b64decode_error(self):
+        self.assertRaises(TypeError, base64.b64decode, 'abc')
+
+    def test_b32encode(self):
+        eq = self.assertEqual
+        eq(base64.b32encode(''), '')
+        eq(base64.b32encode('a'), 'ME======')
+        eq(base64.b32encode('ab'), 'MFRA====')
+        eq(base64.b32encode('abc'), 'MFRGG===')
+        eq(base64.b32encode('abcd'), 'MFRGGZA=')
+        eq(base64.b32encode('abcde'), 'MFRGGZDF')
+
+    def test_b32decode(self):
+        eq = self.assertEqual
+        eq(base64.b32decode(''), '')
+        eq(base64.b32decode('ME======'), 'a')
+        eq(base64.b32decode('MFRA===='), 'ab')
+        eq(base64.b32decode('MFRGG==='), 'abc')
+        eq(base64.b32decode('MFRGGZA='), 'abcd')
+        eq(base64.b32decode('MFRGGZDF'), 'abcde')
+
+    def test_b32decode_casefold(self):
+        eq = self.assertEqual
+        eq(base64.b32decode('', True), '')
+        eq(base64.b32decode('ME======', True), 'a')
+        eq(base64.b32decode('MFRA====', True), 'ab')
+        eq(base64.b32decode('MFRGG===', True), 'abc')
+        eq(base64.b32decode('MFRGGZA=', True), 'abcd')
+        eq(base64.b32decode('MFRGGZDF', True), 'abcde')
+        # Lower cases
+        eq(base64.b32decode('me======', True), 'a')
+        eq(base64.b32decode('mfra====', True), 'ab')
+        eq(base64.b32decode('mfrgg===', True), 'abc')
+        eq(base64.b32decode('mfrggza=', True), 'abcd')
+        eq(base64.b32decode('mfrggzdf', True), 'abcde')
+        # Expected exceptions
+        self.assertRaises(TypeError, base64.b32decode, 'me======')
+        # Mapping zero and one
+        eq(base64.b32decode('MLO23456'), 'b\xdd\xad\xf3\xbe')
+        eq(base64.b32decode('M1023456', map01='L'), 'b\xdd\xad\xf3\xbe')
+        eq(base64.b32decode('M1023456', map01='I'), 'b\x1d\xad\xf3\xbe')
+
+    def test_b32decode_error(self):
+        self.assertRaises(TypeError, base64.b32decode, 'abc')
+        self.assertRaises(TypeError, base64.b32decode, 'ABCDEF==')
+
+    def test_b16encode(self):
+        eq = self.assertEqual
+        eq(base64.b16encode('\x01\x02\xab\xcd\xef'), '0102ABCDEF')
+
+    def test_b16decode(self):
+        eq = self.assertEqual
+        eq(base64.b16decode('0102ABCDEF'), '\x01\x02\xab\xcd\xef')
+        # Lower case is not allowed without a flag
+        self.assertRaises(TypeError, base64.b16decode, '0102abcdef')
+        # Case fold
+        eq(base64.b16decode('0102abcdef', True), '\x01\x02\xab\xcd\xef')
+
+
+
+def suite():
+    suite = unittest.TestSuite()
+    suite.addTest(unittest.makeSuite(LegacyBase64TestCase))
+    suite.addTest(unittest.makeSuite(BaseXYTestCase))
+    return suite
+
 
 def test_main():
-    test_support.run_unittest(Base64TestCase)
+    test_support.run_suite(suite())
 
-if __name__ == "__main__":
-    test_main()
+
+if __name__ == '__main__':
+    unittest.main(defaultTest='suite')