It can be deployed normally on AWS

![image](https://user-images.githubusercontent.com/38454210/78279329-f1528180-7549-11ea-8aec-ba9620a16609.png)

![image](https://user-images.githubusercontent.com/38454210/78279477-25c63d80-754a-11ea-92bc-313e7950424c.png)


distinct_tags = [tag for idx, tag in enumerate(tags['Tags']) if tag not in tags['Tags'][:idx]]
        # t
        self.assertEqual(len(tags['Tags']), len(distinct_tags))
        self.assertEqual(len(tags['Tags']), 2)
        self.assertEqual(tags['Tags'][0]['Key'], '123')
        self.assertEqual(tags['Tags'][0]['Value'], 'abc')
        self.assertEqual(tags['Tags'][1]['Key'], '456')
        self.assertEqual(tags['Tags'][1]['Value'], 'def')
        self.sns_client.untag_resource(
            ResourceArn=self.topic_arn,
            TagKeys=['123']
        )
        tags = self.sns_client.list_tags_for_resource(ResourceArn=self.topic_arn)
        self.assertEqual(len(tags['Tags']), 1)
        self.assertEqual(tags['Tags'][0]['Key'], '456')
        self.assertEqual(tags['Tags'][0]['Value'], 'def')
        self.sns_client.tag_resource(
            ResourceArn=self.topic_arn,
            Tags=[
                {
                    'Key': '456',
                    'Value': 'pqr'
                }
            ]
        )
        tags = self.sns_client.list_tags_for_resource(ResourceArn=self.topic_arn)
        self.assertEqual(len(tags['Tags']), 1)
        self.assertEqual(tags['Tags'][0]['Key'], '456')
        self.assertEqual(tags['Tags'][0]['Value'], 'pqr')
    def test_topic_subscription(self):