old_contents: import unittest
  import os
  from vultr import Vultr, VultrError
  
  
  class UnauthenticateTests(unittest.TestCase):
  
      def setUp(self):
          self.vultr = Vultr('')
  
      def test_plans_list(self):
          response = self.vultr.plans_list()
  
      def test_regions_list(self):
          response = self.vultr.regions_list()
  
      def test_os_list(self):
          response = self.vultr.os_list()
  
      def test_app_list(self):
          response = self.vultr.app_list()
  
  
  class AuthenticatedTests(unittest.TestCase):
  
      def setUp(self):
          if os.environ.get('VULTR_KEY') is None:
              raise Exception(
                  'AuthenticatedTests Require the VULTR_KEY environment varaible to be set.')
          self.vultr = Vultr(os.environ['VULTR_KEY'])
  
      def test_get_api_key(self):
          response = self.vultr.iso_list()
  
      def test_post_api_key(self):
          try:
              response = self.vultr.server_label_set('', '')
          except VultrError as e:
              msg = e.message
              self.assertEqual(msg, "Request failed. Check the response body" +
                                    " for a more detailed description. Body:" +
                                    " \nInvalid server.  Check SUBID value and" +
                                    " ensure your API key matches the server's" +
                                    " account")
  
  
  if __name__ == '__main__':
      unittest.main()
  
new_contents: import unittest
  import os
  from vultr import Vultr, VultrError
  
  
  class UnauthenticateTests(unittest.TestCase):
  
      def setUp(self):
          self.vultr = Vultr('')
  
      def test_plans_list(self):
          response = self.vultr.plans_list()
  
      def test_regions_list(self):
          response = self.vultr.regions_list()
  
      def test_os_list(self):
          response = self.vultr.os_list()
  
      def test_app_list(self):
          response = self.vultr.app_list()
  
  
  class AuthenticatedTests(unittest.TestCase):
  
      def setUp(self):
          if os.environ.get('VULTR_KEY') is None:
              raise Exception(
                  'AuthenticatedTests Require the VULTR_KEY environment' +
                  ' varaible to be set.')
          self.vultr = Vultr(os.environ['VULTR_KEY'])
  
      def test_get_api_key(self):
          response = self.vultr.iso_list()
  
      def test_post_api_key(self):
          try:
              response = self.vultr.server_label_set('', '')
          except VultrError as e:
              msg = e.message
              self.assertEqual(msg, "Request failed. Check the response body" +
                                    " for a more detailed description. Body:" +
                                    " \nInvalid server.  Check SUBID value and" +
                                    " ensure your API key matches the server's" +
                                    " account")
  
  
  if __name__ == '__main__':
      unittest.main()
  
subject: Fix pep8 style.