old_contents: import unittest
  
  from nymms import registry
  from nymms.resources import Command, MonitoringGroup
  from weakref import WeakValueDictionary
  
  
  class TestRegistry(unittest.TestCase):
      def tearDown(self):
          # Ensure we have a fresh registry after every test
          Command.registry.clear()
  
      def test_empty_registry(self):
          self.assertEqual(Command.registry, WeakValueDictionary())
  
      def test_register_object(self):
          # First test it's empty
          self.assertEqual(Command.registry, WeakValueDictionary())
          # Add a command
          command = Command('test_command', '/bin/true')
          # verify that there is only a single command in the registry
          self.assertEqual(len(Command.registry), 1)
          # Verify that the registered command is the same as command
          self.assertIs(Command.registry[command.name], command)
  
      def test_duplicate_register(self):
          # add a command
          Command('test_command', '/bin/true')
          with self.assertRaises(registry.DuplicateEntryError):
              Command('test_command', '/bin/true')
  
      def test_invalid_resource_register(self):
          with self.assertRaises(TypeError):
              Command.registry['test'] = MonitoringGroup('test_group')
  
new_contents: import unittest
  
  from nymms import registry
  from nymms.resources import Command, MonitoringGroup
  from weakref import WeakValueDictionary
  
  
  class TestRegistry(unittest.TestCase):
      def setUp(self):
          # Ensure we have a fresh registry before every test
          Command.registry.clear()
  
      def test_empty_registry(self):
          self.assertEqual(Command.registry, WeakValueDictionary())
  
      def test_register_object(self):
          # First test it's empty
          self.assertEqual(Command.registry, WeakValueDictionary())
          # Add a command
          command = Command('test_command', '/bin/true')
          # verify that there is only a single command in the registry
          self.assertEqual(len(Command.registry), 1)
          # Verify that the registered command is the same as command
          self.assertIs(Command.registry[command.name], command)
  
      def test_duplicate_register(self):
          # add a command
          print Command.registry
          Command('test_command', '/bin/true')
          with self.assertRaises(registry.DuplicateEntryError):
              Command('test_command', '/bin/true')
  
      def test_invalid_resource_register(self):
          with self.assertRaises(TypeError):
              Command.registry['test'] = MonitoringGroup('test_group')
  
subject: Clear command registry BEFORE each test.