text: 
  from django.utils.timezone import now as timezone_now
  
  from zerver.lib.actions import do_create_user, do_deactivate_user, \
      do_activate_user, do_reactivate_user, do_change_password, \
      do_change_user_email, do_change_avatar_fields, do_change_bot_owner, \
      do_regenerate_api_key, do_change_full_name, do_change_tos_version, \
      bulk_add_subscriptions, bulk_remove_subscriptions
  from zerver.lib.test_classes import ZulipTestCase
  from zerver.models import RealmAuditLog, get_realm
  
  from datetime import timedelta
  from django.contrib.auth.password_validation import validate_password
  
  import ujson
  
  class TestRealmAuditLog(ZulipTestCase):
      def test_user_activation(self):
          # type: () -> None
          realm = get_realm('zulip')
          now = timezone_now()
          user = do_create_user('email', 'password', realm, 'full_name', 'short_name')
          do_deactivate_user(user)
          do_activate_user(user)
          do_deactivate_user(user)
          do_reactivate_user(user)
          self.assertEqual(RealmAuditLog.objects.filter(event_time__gte=now).count(), 5)
          event_types = list(RealmAuditLog.objects.filter(
              realm=realm, acting_user=None, modified_user=user, modified_stream=None,
              event_time__gte=now, event_time__lte=now+timedelta(minutes=60))
              .order_by('event_time').values_list('event_type', flat=True))
          self.assertEqual(event_types, ['user_created', 'user_deactivated', 'user_activated',
                                         'user_deactivated', 'user_reactivated'])
  
      def test_change_password(self):
          # type: () -> None
          now = timezone_now()
          user = self.example_user('hamlet')
          password = 'test1'
          do_change_password(user, password)
          self.assertEqual(RealmAuditLog.objects.filter(event_type='user_change_password',
                                                        event_time__gte=now).count(), 1)
          self.assertIsNone(validate_password(password, user))
  
      def test_change_email(self):
          # type: () -> None
          now = timezone_now()
          user = self.example_user('hamlet')
          email = 'test@example.com'
          do_change_user_email(user, email)
          self.assertEqual(RealmAuditLog.objects.filter(event_type='user_email_changed',
                                                        event_time__gte=now).count(), 1)
          self.assertEqual(email, user.email)
  
      def test_change_avatar_source(self):
          # type: () -> None
          now = timezone_now()
          user = self.example_user('hamlet')
          avatar_source = u'G'
          do_change_avatar_fields(user, avatar_source)
          self.assertEqual(RealmAuditLog.objects.filter(event_type='user_change_avatar_source',
                                                        event_time__gte=now).count(), 1)
          self.assertEqual(avatar_source, user.avatar_source)
  
      def test_change_full_name(self):
          # type: () -> None
          start = timezone_now()
          new_name = 'George Hamletovich'
          self.login(self.example_email("iago"))
          req = dict(full_name=ujson.dumps(new_name))
          result = self.client_patch('/json/users/hamlet@zulip.com', req)
          self.assertTrue(result.status_code == 200)
          query = RealmAuditLog.objects.filter(event_type='user_full_name_changed',
                                               event_time__gte=start)
          self.assertEqual(query.count(), 1)
  
      def test_change_tos_version(self):
          # type: () -> None
          now = timezone_now()
          user = self.example_user("hamlet")
          tos_version = 'android'
          do_change_tos_version(user, tos_version)
          self.assertEqual(RealmAuditLog.objects.filter(event_type='user_tos_version_changed',
                                                        event_time__gte=now).count(), 1)
          self.assertEqual(tos_version, user.tos_version)
  
      def test_change_bot_owner(self):
          # type: () -> None
          now = timezone_now()
          admin = self.example_user('iago')
          bot = self.notification_bot()
          bot_owner = self.example_user('hamlet')
          do_change_bot_owner(bot, bot_owner, admin)
          self.assertEqual(RealmAuditLog.objects.filter(event_type='bot_owner_changed',
                                                        event_time__gte=now).count(), 1)
          self.assertEqual(bot_owner, bot.bot_owner)
  
      def test_regenerate_api_key(self):
          # type: () -> None
          now = timezone_now()
          user = self.example_user('hamlet')
          do_regenerate_api_key(user, user)
          self.assertEqual(RealmAuditLog.objects.filter(event_type='user_api_key_changed',
                                                        event_time__gte=now).count(), 1)
          self.assertTrue(user.api_key)
  
      def test_subscriptions(self):
          # type: () -> None
          now = timezone_now()
          user = [self.example_user('hamlet')]
          stream = [self.make_stream('test_stream')]
  
          bulk_add_subscriptions(stream, user)
          subscription_creation_logs = RealmAuditLog.objects.filter(event_type='subscription_created',
                                                                    event_time__gte=now)
          self.assertEqual(subscription_creation_logs.count(), 1)
          self.assertEqual(subscription_creation_logs[0].modified_stream, stream[0])
          self.assertEqual(subscription_creation_logs[0].modified_user, user[0])
  
          bulk_remove_subscriptions(user, stream)
          subscription_deactivation_logs = RealmAuditLog.objects.filter(event_type='subscription_deactivated',
                                                                        event_time__gte=now)
          self.assertEqual(subscription_deactivation_logs.count(), 1)
          self.assertEqual(subscription_deactivation_logs[0].modified_stream, stream[0])
          self.assertEqual(subscription_deactivation_logs[0].modified_user, user[0])
  