human
Solve the following python programming problem given the following code:
@ patch.object (Collector, 'flush') 
def test_blacklisting(self, publish_mock) : 
    def se(url) : 
        return self.getFixture ('kafka_server.json') 
patch_urlopen = patch ('urllib2.urlopen', Mock (side_effect = se)) 
    with metrics : 
        self.collector.collect () 
        self.assertEquals (len (self.collector.payload), 24) 
metrics = find_metric (self.collector.payload, 'kafka.server.BrokerTopicMetrics.MessagesInPerSec.meanrate') 
    self.assertEquals (len (metrics), 0) 

    
    

    Fix the buggy line: with metrics :
assistant
#Here is Python program to fix the buggy line: with metrics :
.

with patch_urlopen :