Index: subversion/bindings/swig/python/tests/checksum.py
===================================================================
--- subversion/bindings/swig/python/tests/checksum.py	(revision 1446877)
+++ subversion/bindings/swig/python/tests/checksum.py	(working copy)
@@ -18,9 +18,10 @@
 # under the License.
 #
 #
+import sys
 import unittest, setup_path
 import svn.core
-
+LENGTH = svn.core.svn_checksum_size(svn.core.svn_checksum_create(svn.core.svn_checksum_md5))
 class ChecksumTestCases(unittest.TestCase):
     def test_checksum(self):
         # Checking primarily the return type for the svn_checksum_create
@@ -28,7 +29,12 @@ class ChecksumTestCases(unittest.TestCase):
         kind, expected_length = svn.core.svn_checksum_md5, 128/8
         val = svn.core.svn_checksum_create(kind)
         check_val = svn.core.svn_checksum_to_cstring_display(val)
+        is_duplicate = svn.core.svn_checksum_dup(val);
 
+        self.assertEqual(type(check_val),str,"Type of digest not string")
+        self.assertEqual(len(check_val)%LENGTH,0,"Length of digest does not match kind")
+        self.assertEqual(int(check_val),0,"Value of initialized digest is not 0")
+
         self.assertTrue(isinstance(check_val, str),
                               "Type of digest not string")
         self.assertEqual(len(check_val), 2*expected_length,
@@ -36,6 +42,8 @@ class ChecksumTestCases(unittest.TestCase):
         self.assertEqual(int(check_val), 0,
                          "Value of initialized digest is not 0")
 
+        self.assertTrue(type(val) is  type(is_duplicate),
+                          "Type of return value not svn_checksum_t*")
 def suite():
     return unittest.defaultTestLoader.loadTestsFromTestCase(ChecksumTestCases)
 
@@ -45,4 +53,3 @@ if __name__ == '__main__':
     
 
 
-