old_contents: from twisted.trial.unittest import TestCase
  
  from go_metrics.metrics.dummy import Fixtures, DummyMetrics, DummyBackend
  DummyBackend, DummyMetrics
  
  
  class TestFixtures(TestCase):
      def test_add(self):
          fixtures = Fixtures()
          fixtures.add(foo='bar', result={'baz': 'quux'})
          self.assertEqual(fixtures.items, [{
              'foo': 'bar',
              'result': {'baz': 'quux'}
          }])
  
      def test_add_no_result(self):
          fixtures = Fixtures()
          fixtures.add(foo='bar')
          self.assertEqual(fixtures.items, [{
              'foo': 'bar',
              'result': {}
          }])
  
      def test_match(self):
          fixtures = Fixtures()
          fixtures.add(foo='bar', result={'baz': 'quux'})
          fixtures.add(corge='grault', result={'garply': 'waldo'})
          self.assertEqual(fixtures.match(foo='bar'), {'baz': 'quux'})
          self.assertEqual(fixtures.match(corge='grault'), {'garply': 'waldo'})
          self.assertEqual(fixtures.match(fred='xzyy'), {})
  
  
  class TestDummyMetrics(TestCase):
      def test_get(self):
          backend = DummyBackend()
          metrics = DummyMetrics(backend, 'owner-1')
          backend.fixtures.add(foo='bar', result={'baz': 'quux'})
          self.assertEqual(metrics.get(foo='bar'), {'baz': 'quux'})
  
  
  class TestDummyBackend(TestCase):
      pass
  
new_contents: from twisted.trial.unittest import TestCase
  
  from go_metrics.metrics.dummy import Fixtures, DummyMetrics, DummyBackend
  
  
  class TestFixtures(TestCase):
      def test_add(self):
          fixtures = Fixtures()
          fixtures.add(foo='bar', result={'baz': 'quux'})
          self.assertEqual(fixtures.items, [{
              'foo': 'bar',
              'result': {'baz': 'quux'}
          }])
  
      def test_add_no_result(self):
          fixtures = Fixtures()
          fixtures.add(foo='bar')
          self.assertEqual(fixtures.items, [{
              'foo': 'bar',
              'result': {}
          }])
  
      def test_match(self):
          fixtures = Fixtures()
          fixtures.add(foo='bar', result={'baz': 'quux'})
          fixtures.add(corge='grault', result={'garply': 'waldo'})
          self.assertEqual(fixtures.match(foo='bar'), {'baz': 'quux'})
          self.assertEqual(fixtures.match(corge='grault'), {'garply': 'waldo'})
          self.assertEqual(fixtures.match(fred='xzyy'), {})
  
  
  class TestDummyMetrics(TestCase):
      def test_get(self):
          backend = DummyBackend()
          metrics = DummyMetrics(backend, 'owner-1')
          backend.fixtures.add(foo='bar', result={'baz': 'quux'})
          self.assertEqual(metrics.get(foo='bar'), {'baz': 'quux'})
  
  
  class TestDummyBackend(TestCase):
      pass
  
subject: Remove no longer needed references for keeping pep8 happy