diff --git a/Lib/test/string_tests.py b/Lib/test/string_tests.py
index 0ce212c..fe159b6 100644
--- a/Lib/test/string_tests.py
+++ b/Lib/test/string_tests.py
@@ -1096,58 +1096,6 @@
         self.checkraises(TypeError, S, 'rpartition', None)
 
 
-class MixinStrStringUserStringTest:
-    # Additional tests for 8bit strings, i.e. str, UserString and
-    # the string module
-
-    def test_maketrans(self):
-        self.assertEqual(
-           ''.join(map(chr, range(256))).replace('abc', 'xyz'),
-           string.maketrans('abc', 'xyz')
-        )
-        self.assertRaises(ValueError, string.maketrans, 'abc', 'xyzw')
-
-    def test_translate(self):
-        table = string.maketrans('abc', 'xyz')
-        self.checkequal('xyzxyz', 'xyzabcdef', 'translate', table, 'def')
-
-        table = string.maketrans('a', 'A')
-        self.checkequal('Abc', 'abc', 'translate', table)
-        self.checkequal('xyz', 'xyz', 'translate', table)
-        self.checkequal('yz', 'xyz', 'translate', table, 'x')
-        self.checkequal('yx', 'zyzzx', 'translate', None, 'z')
-        self.checkequal('zyzzx', 'zyzzx', 'translate', None, '')
-        self.checkequal('zyzzx', 'zyzzx', 'translate', None)
-        self.checkraises(ValueError, 'xyz', 'translate', 'too short', 'strip')
-        self.checkraises(ValueError, 'xyz', 'translate', 'too short')
-
-
-class MixinStrUserStringTest:
-    # Additional tests that only work with
-    # 8bit compatible object, i.e. str and UserString
-
-    def test_encoding_decoding(self):
-        codecs = [('rot13', b'uryyb jbeyq'),
-                  ('base64', b'aGVsbG8gd29ybGQ=\n'),
-                  ('hex', b'68656c6c6f20776f726c64'),
-                  ('uu', b'begin 666 <data>\n+:&5L;&\\@=V]R;&0 \n \nend\n')]
-        for encoding, data in codecs:
-            self.checkequal(data, 'hello world', 'encode', encoding)
-            self.checkequal('hello world', data, 'decode', encoding)
-        # zlib is optional, so we make the test optional too...
-        try:
-            import zlib
-        except ImportError:
-            pass
-        else:
-            data = b'x\x9c\xcbH\xcd\xc9\xc9W(\xcf/\xcaI\x01\x00\x1a\x0b\x04]'
-            self.checkequal(data, 'hello world', 'encode', 'zlib')
-            self.checkequal('hello world', data, 'decode', 'zlib')
-
-        self.checkraises(TypeError, 'xyz', 'decode', 42)
-        self.checkraises(TypeError, 'xyz', 'encode', 42)
-
-
 class MixinStrUnicodeTest:
     # Additional tests that only work with str and unicode.
 
diff --git a/Lib/test/test_str.py b/Lib/test/test_str.py
index 2ef01f0..ad118d6 100644
--- a/Lib/test/test_str.py
+++ b/Lib/test/test_str.py
@@ -8,7 +8,6 @@
 class StrTest(
     string_tests.CommonTest,
     string_tests.MixinStrUnicodeUserStringTest,
-    string_tests.MixinStrUserStringTest,
     string_tests.MixinStrUnicodeTest,
     ):
 
diff --git a/Lib/test/test_unicode.py b/Lib/test/test_unicode.py
index fbad984..11c7328 100644
--- a/Lib/test/test_unicode.py
+++ b/Lib/test/test_unicode.py
@@ -791,7 +791,7 @@
         # to take a 64-bit long, this test should apply to all platforms.
         if sys.maxint > (1 << 32) or struct.calcsize('P') != 4:
             return
-        self.assertRaises(OverflowError, u't\tt\t'.expandtabs, sys.maxint)
+        self.assertRaises(OverflowError, 't\tt\t'.expandtabs, sys.maxint)
 
 
 def test_main():
diff --git a/Lib/test/test_userstring.py b/Lib/test/test_userstring.py
index 53114db..ec0f1a9 100755
--- a/Lib/test/test_userstring.py
+++ b/Lib/test/test_userstring.py
@@ -10,8 +10,6 @@
 class UserStringTest(
     string_tests.CommonTest,
     string_tests.MixinStrUnicodeUserStringTest,
-    string_tests.MixinStrStringUserStringTest,
-    string_tests.MixinStrUserStringTest
     ):
 
     type2test = UserString