raise ValueError if the argument to node.replace_rdataset() is not an rdataset

diff --git a/dns/node.py b/dns/node.py
index 7625c66d3acf196313e9a82f26f2b81692fcafb7..f480610a6b69b9c86819bd085d1c14ba519ece75 100644 (file)
--- a/dns/node.py
+++ b/dns/node.py
@@ -167,6 +167,8 @@ class Node(object):
         at the node, it stores I{replacement} itself.
         """
 
+        if not isinstance(replacement, dns.rdataset.Rdataset):
+            raise ValueError, 'replacement is not an rdataset'
         self.delete_rdataset(replacement.rdclass, replacement.rdtype,
                              replacement.covers)
         self.rdatasets.append(replacement)