text: import unittest
  import json
  import boto3
  import os
  from mock import MagicMock
  from moto import mock_autoscaling, mock_ec2
  from tagger.ec2_tagger import EC2Tagger
  
  class TestEC2Tagger(unittest.TestCase):
      
      @mock_ec2
      def setUp(self):
          json_data = open('./test/example_events/run_instances.json').read()
          self.event = json.loads(json_data)
          self.region = 'us-west-2'
          os.environ['AWS_REGION'] = 'us-west-2'
          
      
      @mock_ec2
      def test_start(self):
          self.tagger = EC2Tagger(self.event, None)
          response = self.tagger.start()
          response_metadata = response['ResponseMetadata']
          self.assertEqual(response_metadata['HTTPStatusCode'], 200)