new_contents: import os
  import tempfile
  import unittest
  
  import bin.receiver
  from ssm.ssm2 import Ssm2Exception
  
  
  class getDNsTest(unittest.TestCase):
      def setUp(self):
          self.tf, self.tf_path = tempfile.mkstemp()
          os.close(self.tf)
  
      def test_empty_dns_file(self):
          self.assertRaises(Ssm2Exception, bin.receiver.get_dns, self.tf_path)
  
      def tearDown(self):
          os.remove(self.tf_path)
  
  
  if __name__ == '__main__':
      unittest.main()
  
subject: Add skeleton test for bin/receiver