human
Solve the following python programming problem given the following code:
def test_set_datastore_policy(testbed) : 
    def policy(key) : 
        return (key is None) 
snippets.set_datastore_policy (policy) 
    assert (ndb.get_context ().get_datastore_policy () == testbed) 

    
    

    Fix the buggy line: assert (ndb.get_context ().get_datastore_policy () == testbed)
assistant
#Here is Python code to fix the buggy line: assert (ndb.

assert (ndb.get_context ().get_datastore_policy () == policy)