Remive test cases in base64.py

Author: Eddy114514

Lib/test/test_base64.py

@@ -111,13 +111,6 @@ def test_b64encode(self):
         eq(base64.urlsafe_b64encode('\xd3V\xbeo\xf7\x1d'), '01a-b_cd')
         # Non-bytes
         eq(base64.urlsafe_b64encode(bytearray('\xd3V\xbeo\xf7\x1d')), '01a-b_cd')
-        
-    def test_b64encode_warns(self):
-        import warnings, base64
-        with warnings.catch_warnings(record=True) as w:
-            warnings.simplefilter('always', UserWarning)
-            base64.b64encode(b'test')
-            self.assertTrue(any('base64.b64encode returns str in Python 2 (bytes in 3.x)' == str(x.message) for x in w))
 
     def test_b64decode(self):
         eq = self.assertEqual