diff --git a/Lib/test/string_tests.py b/Lib/test/string_tests.py
index feeb4ce..b7246eb 100644
--- a/Lib/test/string_tests.py
+++ b/Lib/test/string_tests.py
@@ -56,7 +56,7 @@
         result = self.fixtype(result)
         obj = self.fixtype(obj)
         args = self.fixtype(args)
-        kwargs = self.fixtype(kwargs)
+        kwargs = {k: self.fixtype(v) for k,v in kwargs.items()}
         realresult = getattr(obj, methodname)(*args, **kwargs)
         self.assertEqual(
             result,
@@ -389,6 +389,17 @@
         self.checkequal(['a']*18 + ['aBLAHa'], ('aBLAH'*20)[:-4],
                         'split', 'BLAH', 18)
 
+        # with keyword args
+        self.checkequal(['a', 'b', 'c', 'd'], 'a|b|c|d', 'split', sep='|')
+        self.checkequal(['a', 'b|c|d'],
+                        'a|b|c|d', 'split', '|', maxsplit=1)
+        self.checkequal(['a', 'b|c|d'],
+                        'a|b|c|d', 'split', sep='|', maxsplit=1)
+        self.checkequal(['a', 'b|c|d'],
+                        'a|b|c|d', 'split', maxsplit=1, sep='|')
+        self.checkequal(['a', 'b c d'],
+                        'a b c d', 'split', maxsplit=1)
+
         # argument type
         self.checkraises(TypeError, 'hello', 'split', 42, 42, 42)
 
@@ -446,6 +457,17 @@
         self.checkequal(['aBLAHa'] + ['a']*18, ('aBLAH'*20)[:-4],
                         'rsplit', 'BLAH', 18)
 
+        # with keyword args
+        self.checkequal(['a', 'b', 'c', 'd'], 'a|b|c|d', 'rsplit', sep='|')
+        self.checkequal(['a|b|c', 'd'],
+                        'a|b|c|d', 'rsplit', '|', maxsplit=1)
+        self.checkequal(['a|b|c', 'd'],
+                        'a|b|c|d', 'rsplit', sep='|', maxsplit=1)
+        self.checkequal(['a|b|c', 'd'],
+                        'a|b|c|d', 'rsplit', maxsplit=1, sep='|')
+        self.checkequal(['a b c', 'd'],
+                        'a b c d', 'rsplit', maxsplit=1)
+
         # argument type
         self.checkraises(TypeError, 'hello', 'rsplit', 42, 42, 42)
 
diff --git a/Lib/test/test_bytes.py b/Lib/test/test_bytes.py
index bfb88de..203fc5c 100644
--- a/Lib/test/test_bytes.py
+++ b/Lib/test/test_bytes.py
@@ -435,6 +435,14 @@
         self.assertEqual(b.split(b'i'), [b'm', b'ss', b'ss', b'pp', b''])
         self.assertEqual(b.split(b'ss'), [b'mi', b'i', b'ippi'])
         self.assertEqual(b.split(b'w'), [b])
+        # with keyword args
+        b = self.type2test(b'a|b|c|d')
+        self.assertEqual(b.split(sep=b'|'), [b'a', b'b', b'c', b'd'])
+        self.assertEqual(b.split(b'|', maxsplit=1), [b'a', b'b|c|d'])
+        self.assertEqual(b.split(sep=b'|', maxsplit=1), [b'a', b'b|c|d'])
+        self.assertEqual(b.split(maxsplit=1, sep=b'|'), [b'a', b'b|c|d'])
+        b = self.type2test(b'a b c d')
+        self.assertEqual(b.split(maxsplit=1), [b'a', b'b c d'])
 
     def test_split_whitespace(self):
         for b in (b'  arf  barf  ', b'arf\tbarf', b'arf\nbarf', b'arf\rbarf',
@@ -463,6 +471,14 @@
         self.assertEqual(b.rsplit(b'i'), [b'm', b'ss', b'ss', b'pp', b''])
         self.assertEqual(b.rsplit(b'ss'), [b'mi', b'i', b'ippi'])
         self.assertEqual(b.rsplit(b'w'), [b])
+        # with keyword args
+        b = self.type2test(b'a|b|c|d')
+        self.assertEqual(b.rsplit(sep=b'|'), [b'a', b'b', b'c', b'd'])
+        self.assertEqual(b.rsplit(b'|', maxsplit=1), [b'a|b|c', b'd'])
+        self.assertEqual(b.rsplit(sep=b'|', maxsplit=1), [b'a|b|c', b'd'])
+        self.assertEqual(b.rsplit(maxsplit=1, sep=b'|'), [b'a|b|c', b'd'])
+        b = self.type2test(b'a b c d')
+        self.assertEqual(b.rsplit(maxsplit=1), [b'a b c', b'd'])
 
     def test_rsplit_whitespace(self):
         for b in (b'  arf  barf  ', b'arf\tbarf', b'arf\nbarf', b'arf\rbarf',