old_contents: from __future__ import (absolute_import, print_function, unicode_literals)
  from acli.output.elb import (output_elb_info, output_elbs)
  from acli.services.elb import (elb_info, elb_list)
  from acli.config import Config
  from moto import mock_elb
  import pytest
  from boto3.session import Session
  session = Session(region_name="eu-west-1")
  
  
  @pytest.yield_fixture(scope='function')
  def elb_instances():
      """ELB mock service"""
      mock = mock_elb()
      mock.start()
      client = session.client('elb')
      zones = ['eu-west-1a', 'eu-west-1b']
      listeners = [{
              'Protocol': 'string',
              'LoadBalancerPort': 123,
              'InstanceProtocol': 'string',
              'InstancePort': 123,
              'SSLCertificateId': 'string'}]
      client.create_load_balancer(LoadBalancerName='my-lb', AvailabilityZones=zones, Listeners=listeners)
      yield client.describe_load_balancers()
      mock.stop()
  
  
  config = Config(cli_args={'--region': 'eu-west-1',
                            '--access_key_id': 'AKIAIOSFODNN7EXAMPLE',
                            '--secret_access_key': 'wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY'})
  
  
  def test_elb_list_service(elb_instances):
      with pytest.raises(SystemExit):
          assert elb_list(aws_config=config)
  
  
  # def test_elb_info_service(ec2_instances):
  #    with pytest.raises(SystemExit):
  #        assert elb_info(aws_config=config, elb_name=list(ec2_instances)[0].id)
  
  
new_contents: from __future__ import (absolute_import, print_function, unicode_literals)
  from acli.output.elb import (output_elb_info, output_elbs)
  from acli.services.elb import (elb_info, elb_list)
  from acli.config import Config
  from moto import mock_elb
  import pytest
  from boto3.session import Session
  session = Session(region_name="eu-west-1")
  
  
  @pytest.yield_fixture(scope='function')
  def elb_instances():
      """ELB mock service"""
      mock = mock_elb()
      mock.start()
      client = session.client('elb')
      zones = ['eu-west-1a', 'eu-west-1b']
      listeners = [{
              'Protocol': 'string',
              'LoadBalancerPort': 123,
              'InstanceProtocol': 'string',
              'InstancePort': 123,
              'SSLCertificateId': 'string'}]
      client.create_load_balancer(LoadBalancerName='my-lb', AvailabilityZones=zones, Listeners=listeners)
      yield client.describe_load_balancers()
      mock.stop()
  
  
  config = Config(cli_args={'--region': 'eu-west-1',
                            '--access_key_id': 'AKIAIOSFODNN7EXAMPLE',
                            '--secret_access_key': 'wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY'})
  
  
  def test_elb_list_service(elb_instances):
      with pytest.raises(SystemExit):
          assert elb_list(aws_config=config)
  
  
  def test_elb_info_service(elb_instances):
      with pytest.raises(SystemExit):
          assert elb_info(aws_config=config, elb_name='my-lb')
  
  # def test_elb_info_service(ec2_instances):
  #    with pytest.raises(SystemExit):
  #        assert elb_info(aws_config=config, elb_name=list(ec2_instances)[0].id)
  
  
subject: add test for elb info output.