Added Mitchell Surface's regression tests for base64. Closes patch #550002.

Lib/test/test_base64.py

+import unittest
+import test_support
+import base64
+from binascii import Error as binascii_error
+
+class Base64TestCase(unittest.TestCase):
+    def test_encode_string(self):
+        """Testing encode string"""
+        test_support.verify(base64.encodestring("www.python.org") == 
+            "d3d3LnB5dGhvbi5vcmc=\n", 
+            reason="www.python.org encodestring failed")
+        test_support.verify(base64.encodestring("a") == 
+            "YQ==\n", 
+            reason="a encodestring failed")
+        test_support.verify(base64.encodestring("ab") == 
+            "YWI=\n", 
+            reason="ab encodestring failed")
+        test_support.verify(base64.encodestring("abc") == 
+            "YWJj\n", 
+            reason="abc encodestring failed")
+        test_support.verify(base64.encodestring("") == 
+            "", 
+            reason="null encodestring failed")
+        test_support.verify(base64.encodestring(
+            "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#0^&*();:<>,. []{}") ==
+            "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXpBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWjAxMjM0\nNTY3ODkhQCMwXiYqKCk7Ojw+LC4gW117fQ==\n",
+            reason = "long encodestring failed")
+
+    def test_decode_string(self):
+        """Testing decode string"""
+        test_support.verify(base64.decodestring("d3d3LnB5dGhvbi5vcmc=\n") ==
+            "www.python.org", 
+            reason="www.python.org decodestring failed")
+        test_support.verify(base64.decodestring("YQ==\n") ==
+            "a", 
+            reason="a decodestring failed")
+        test_support.verify(base64.decodestring("YWI=\n") ==
+            "ab", 
+            reason="ab decodestring failed")
+        test_support.verify(base64.decodestring("YWJj\n") ==
+            "abc", 
+            reason="abc decodestring failed")
+        test_support.verify(base64.decodestring(
+            "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXpBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWjAxMjM0\nNTY3ODkhQCMwXiYqKCk7Ojw+LC4gW117fQ==\n") ==
+            "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#0^&*();:<>,. []{}",
+            reason = "long decodestring failed")
+        try:
+            base64.decodestring("")
+        except binascii_error:
+            pass
+        else:
+            self.fail("expected a binascii.Error on null decode request")
+            
+def test_main():
+    test_support.run_unittest(Base64TestCase)
+
+if __name__ == "__main__":
+    test_main()
+