old_contents: """
  Role tests
  """
  import pytest
  
  # To run all the tests on given docker images:
  pytestmark = pytest.mark.docker_images(
      'infopen/ubuntu-trusty-ssh:0.1.0',
      'infopen/ubuntu-xenial-ssh-py27:0.2.0'
  )
  
  
  def test_packages(SystemInfo, Package):
  
      assert Package('ntp').is_installed
  
new_contents: """
  Role tests
  """
  import pytest
  
  # To run all the tests on given docker images:
  pytestmark = pytest.mark.docker_images(
      'infopen/ubuntu-trusty-ssh:0.1.0',
      'infopen/ubuntu-xenial-ssh-py27:develop'
  )
  
  
  def test_packages(SystemInfo, Package):
  
      assert Package('ntp').is_installed
  
subject: Add Updated docker image with iproute2 package