new_contents: # -*- coding: utf-8 -*-
  
  # Import Python libs
  from __future__ import absolute_import
  import os
  import tempfile
  
  # Import Salt Libs
  from salt.cloud.clouds import ec2
  from salt.exceptions import SaltCloudSystemExit
  
  # Import Salt Testing Libs
  from salttesting import TestCase, skipIf
  from salttesting.mock import MagicMock, NO_MOCK, NO_MOCK_REASON, patch
  from salttesting.helpers import ensure_in_syspath
  
  ensure_in_syspath('../../../')
  
  @skipIf(NO_MOCK, NO_MOCK_REASON)
  class EC2TestCase(TestCase):
      '''
      Unit TestCase for salt.cloud.clouds.ec2 module.
      '''
      def test__validate_key_path_and_mode(self):
          with tempfile.NamedTemporaryFile() as f:
              key_file = f.name
  
              os.chmod(key_file, 0o644)
              self.assertRaises(SaltCloudSystemExit,
                                ec2._validate_key_path_and_mode,
                                key_file)
              os.chmod(key_file, 0o600)
              self.assertTrue(ec2._validate_key_path_and_mode(key_file))
              os.chmod(key_file, 0o400)
              self.assertTrue(ec2._validate_key_path_and_mode(key_file))
  
          # tmp file removed
          self.assertRaises(SaltCloudSystemExit,
                            ec2._validate_key_path_and_mode,
                            key_file)
  
  if __name__ == '__main__':
      from unit import run_tests
      run_tests(EC2TestCase, needs_daemon=False)
  
subject: Add unit test for _validate_key_file_permissions in ec2 module