new_contents: from mock import patch
  from django.utils import timezone
  from django.test import TestCase
  from breach.strategy import Strategy
  from breach.models import Target, Victim, SampleSet
  
  
  class ErrorHandlingTestCase(TestCase):
      def setUp(self):
          self.target = Target.objects.create(
              endpoint='https://di.uoa.gr/?breach=%s',
              prefix='test',
              alphabet='01',
              secretlength=5,
              recordscardinality=1,
              samplesize=2
          )
  
          self.victim = Victim.objects.create(
              target=self.target,
              sourceip='192.168.10.140',
              snifferendpoint='http://localhost/',
              recordscardinality=1
          )
  
      def tearDown(self):
          for sampleset in SampleSet.objects.all():
              sampleset.completed = timezone.now()
              sampleset.save()
  
      @patch('breach.strategy.Sniffer')
      def test_calibration(self, Sniffer):
          capture0 = {'data': 'bigbignextround', 'records': 3}
          instance = Sniffer.return_value
          instance.read.return_value = capture0
  
          for _ in range(3):
              strategy = Strategy(self.victim)
              strategy.get_work()
              res = strategy.work_completed()
              self.assertTrue(not res)
  
          self.assertEqual(self.victim.calibration_wait, 0.1)
  
      @patch('breach.strategy.Sniffer')
      def test_cardinality(self, Sniffer):
          capture = {'data': 'bigbignextround', 'records': 2}
          instance = Sniffer.return_value
          instance.read.return_value = capture
  
          strategy = Strategy(self.victim)
          strategy.get_work()
          res = strategy.work_completed()
          self.assertTrue(not res)
  
          capture = {'data': 'bigbignextround', 'records': 4}
          instance = Sniffer.return_value
          instance.read.return_value = capture
  
          for _ in range(4):
              strategy = Strategy(self.victim)
              strategy.get_work()
              res = strategy.work_completed()
              self.assertTrue(not res)
  
          self.assertEqual(self.victim.recordscardinality, 2)
          self.assertEqual(self.target.recordscardinality, 2)
  
      @patch('breach.strategy.Sniffer')
      def test_success_error(self, Sniffer):
          capture = {'data': 'bigbignextround', 'records': 2}
          instance = Sniffer.return_value
          instance.read.return_value = capture
  
          strategy = Strategy(self.victim)
          strategy.get_work()
          res = strategy.work_completed(False)
          self.assertTrue(not res)
  
subject: Add strategy error handling tests