Index: test_zlib.py
===================================================================
--- test_zlib.py	(revision 65475)
+++ test_zlib.py	(working copy)
@@ -152,7 +152,11 @@
         bufs.append(co.flush())
         combuf = b''.join(bufs)
 
-        self.assertEqual(data, zlib.decompress(combuf))
+        decombuf = zlib.decompress(combuf)
+        # Test type of return value
+        self.assertEqual(type(decombuf), bytes)
+        
+        self.assertEqual(data, decombuf)
 
         dco = zlib.decompressobj()
         bufs = []
@@ -348,7 +352,9 @@
             # Test copying a decompression object
             data = HAMLET_SCENE
             comp = zlib.compress(data)
-
+            # Test type of return value
+            self.assertEqual(type(comp), bytes)
+            
             d0 = zlib.decompressobj()
             bufs0 = []
             bufs0.append(d0.decompress(comp[:32]))