text: """Dependency injector singleton providers unit tests."""
  
  import sys
  
  import unittest
  
  from dependency_injector import (
      providers,
      errors,
  )
  
  
  class Example(object):
  
      def __init__(self, init_arg1=None, init_arg2=None, init_arg3=None,
                   init_arg4=None):
          self.init_arg1 = init_arg1
          self.init_arg2 = init_arg2
          self.init_arg3 = init_arg3
          self.init_arg4 = init_arg4
  
          self.attribute1 = None
          self.attribute2 = None
  
  
  class _BaseSingletonTestCase(object):
  
      singleton_cls = None
  
      def test_is_provider(self):
          self.assertTrue(providers.is_provider(self.singleton_cls(Example)))
  
      def test_init_with_callable(self):
          self.assertTrue(self.singleton_cls(credits))
  
      def test_init_with_not_callable(self):
          self.assertRaises(errors.Error, self.singleton_cls, 123)
  
      def test_init_optional_provides(self):
          provider = self.singleton_cls()
          provider.set_provides(object)
          self.assertIs(provider.provides, object)
          self.assertIsInstance(provider(), object)
  
      def test_set_provides_returns_self(self):
          provider = self.singleton_cls()
          self.assertIs(provider.set_provides(object), provider)
  
      def test_init_with_valid_provided_type(self):
          class ExampleProvider(self.singleton_cls):
              provided_type = Example
  
          example_provider = ExampleProvider(Example, 1, 2)
  
          self.assertIsInstance(example_provider(), Example)
  
      def test_init_with_valid_provided_subtype(self):
          class ExampleProvider(self.singleton_cls):
              provided_type = Example
  
          class NewExampe(Example):
              pass
  
          example_provider = ExampleProvider(NewExampe, 1, 2)
  
          self.assertIsInstance(example_provider(), NewExampe)
  
      def test_init_with_invalid_provided_type(self):
          class ExampleProvider(self.singleton_cls):
              provided_type = Example
  
          with self.assertRaises(errors.Error):
              ExampleProvider(list)
  
      def test_provided_instance_provider(self):
          provider = providers.Singleton(Example)
          self.assertIsInstance(provider.provided, providers.ProvidedInstance)
  
      def test_call(self):
          provider = self.singleton_cls(Example)
  
          instance1 = provider()
          instance2 = provider()
  
          self.assertIs(instance1, instance2)
          self.assertIsInstance(instance1, Example)
          self.assertIsInstance(instance2, Example)
  
      def test_call_with_init_positional_args(self):
          provider = self.singleton_cls(Example, 'i1', 'i2')
  
          instance1 = provider()
          instance2 = provider()
  
          self.assertEqual(instance1.init_arg1, 'i1')
          self.assertEqual(instance1.init_arg2, 'i2')
  
          self.assertEqual(instance2.init_arg1, 'i1')
          self.assertEqual(instance2.init_arg2, 'i2')
  
          self.assertIs(instance1, instance2)
          self.assertIsInstance(instance1, Example)
          self.assertIsInstance(instance2, Example)
  
      def test_call_with_init_keyword_args(self):
          provider = self.singleton_cls(Example, init_arg1='i1', init_arg2='i2')
  
          instance1 = provider()
          instance2 = provider()
  
          self.assertEqual(instance1.init_arg1, 'i1')
          self.assertEqual(instance1.init_arg2, 'i2')
  
          self.assertEqual(instance2.init_arg1, 'i1')
          self.assertEqual(instance2.init_arg2, 'i2')
  
          self.assertIs(instance1, instance2)
          self.assertIsInstance(instance1, Example)
          self.assertIsInstance(instance2, Example)
  
      def test_call_with_init_positional_and_keyword_args(self):
          provider = self.singleton_cls(Example, 'i1', init_arg2='i2')
  
          instance1 = provider()
          instance2 = provider()
  
          self.assertEqual(instance1.init_arg1, 'i1')
          self.assertEqual(instance1.init_arg2, 'i2')
  
          self.assertEqual(instance2.init_arg1, 'i1')
          self.assertEqual(instance2.init_arg2, 'i2')
  
          self.assertIs(instance1, instance2)
          self.assertIsInstance(instance1, Example)
          self.assertIsInstance(instance2, Example)
  
      def test_call_with_attributes(self):
          provider = self.singleton_cls(Example)
          provider.add_attributes(attribute1='a1', attribute2='a2')
  
          instance1 = provider()
          instance2 = provider()
  
          self.assertEqual(instance1.attribute1, 'a1')
          self.assertEqual(instance1.attribute2, 'a2')
  
          self.assertEqual(instance2.attribute1, 'a1')
          self.assertEqual(instance2.attribute2, 'a2')
  
          self.assertIs(instance1, instance2)
          self.assertIsInstance(instance1, Example)
          self.assertIsInstance(instance2, Example)
  
      def test_call_with_context_args(self):
          provider = self.singleton_cls(Example)
  
          instance = provider(11, 22)
  
          self.assertEqual(instance.init_arg1, 11)
          self.assertEqual(instance.init_arg2, 22)
  
      def test_call_with_context_kwargs(self):
          provider = self.singleton_cls(Example, init_arg1=1)
  
          instance1 = provider(init_arg2=22)
          self.assertEqual(instance1.init_arg1, 1)
          self.assertEqual(instance1.init_arg2, 22)
  
          # Instance is created earlier
          instance1 = provider(init_arg1=11, init_arg2=22)
          self.assertEqual(instance1.init_arg1, 1)
          self.assertEqual(instance1.init_arg2, 22)
  
      def test_call_with_context_args_and_kwargs(self):
          provider = self.singleton_cls(Example, 11)
  
          instance = provider(22, init_arg3=33, init_arg4=44)
  
          self.assertEqual(instance.init_arg1, 11)
          self.assertEqual(instance.init_arg2, 22)
          self.assertEqual(instance.init_arg3, 33)
          self.assertEqual(instance.init_arg4, 44)
  
      def test_fluent_interface(self):
          provider = self.singleton_cls(Example) \
              .add_args(1, 2) \
              .add_kwargs(init_arg3=3, init_arg4=4) \
              .add_attributes(attribute1=5, attribute2=6)
  
          instance = provider()
  
          self.assertEqual(instance.init_arg1, 1)
          self.assertEqual(instance.init_arg2, 2)
          self.assertEqual(instance.init_arg3, 3)
          self.assertEqual(instance.init_arg4, 4)
          self.assertEqual(instance.attribute1, 5)
          self.assertEqual(instance.attribute2, 6)
  
      def test_set_args(self):
          provider = self.singleton_cls(Example) \
              .add_args(1, 2) \
              .set_args(3, 4)
          self.assertEqual(provider.args, (3, 4))
  
      def test_set_kwargs(self):
          provider = self.singleton_cls(Example) \
              .add_kwargs(init_arg3=3, init_arg4=4) \
              .set_kwargs(init_arg3=4, init_arg4=5)
          self.assertEqual(provider.kwargs, dict(init_arg3=4, init_arg4=5))
  
      def test_set_attributes(self):
          provider = self.singleton_cls(Example) \
              .add_attributes(attribute1=5, attribute2=6) \
              .set_attributes(attribute1=6, attribute2=7)
          self.assertEqual(provider.attributes, dict(attribute1=6, attribute2=7))
  
      def test_clear_args(self):
          provider = self.singleton_cls(Example) \
              .add_args(1, 2) \
              .clear_args()
          self.assertEqual(provider.args, tuple())
  
      def test_clear_kwargs(self):
          provider = self.singleton_cls(Example) \
              .add_kwargs(init_arg3=3, init_arg4=4) \
              .clear_kwargs()
          self.assertEqual(provider.kwargs, dict())
  
      def test_clear_attributes(self):
          provider = self.singleton_cls(Example) \
              .add_attributes(attribute1=5, attribute2=6) \
              .clear_attributes()
          self.assertEqual(provider.attributes, dict())
  
      def test_call_overridden(self):
          provider = self.singleton_cls(Example)
          overriding_provider1 = self.singleton_cls(dict)
          overriding_provider2 = self.singleton_cls(list)
  
          provider.override(overriding_provider1)
          provider.override(overriding_provider2)
  
          instance1 = provider()
          instance2 = provider()
  
          self.assertIs(instance1, instance2)
          self.assertIsInstance(instance1, list)
          self.assertIsInstance(instance2, list)
  
      def test_deepcopy(self):
          provider = self.singleton_cls(Example)
  
          provider_copy = providers.deepcopy(provider)
  
          self.assertIsNot(provider, provider_copy)
          self.assertIs(provider.cls, provider_copy.cls)
          self.assertIsInstance(provider, self.singleton_cls)
  
      def test_deepcopy_from_memo(self):
          provider = self.singleton_cls(Example)
          provider_copy_memo = self.singleton_cls(Example)
  
          provider_copy = providers.deepcopy(
              provider, memo={id(provider): provider_copy_memo})
  
          self.assertIs(provider_copy, provider_copy_memo)
  
      def test_deepcopy_args(self):
          provider = self.singleton_cls(Example)
          dependent_provider1 = self.singleton_cls(list)
          dependent_provider2 = self.singleton_cls(dict)
  
          provider.add_args(dependent_provider1, dependent_provider2)
  
          provider_copy = providers.deepcopy(provider)
          dependent_provider_copy1 = provider_copy.args[0]
          dependent_provider_copy2 = provider_copy.args[1]
  
          self.assertNotEqual(provider.args, provider_copy.args)
  
          self.assertIs(dependent_provider1.cls, dependent_provider_copy1.cls)
          self.assertIsNot(dependent_provider1, dependent_provider_copy1)
  
          self.assertIs(dependent_provider2.cls, dependent_provider_copy2.cls)
          self.assertIsNot(dependent_provider2, dependent_provider_copy2)
  
      def test_deepcopy_kwargs(self):
          provider = self.singleton_cls(Example)
          dependent_provider1 = self.singleton_cls(list)
          dependent_provider2 = self.singleton_cls(dict)
  
          provider.add_kwargs(a1=dependent_provider1, a2=dependent_provider2)
  
          provider_copy = providers.deepcopy(provider)
          dependent_provider_copy1 = provider_copy.kwargs['a1']
          dependent_provider_copy2 = provider_copy.kwargs['a2']
  
          self.assertNotEqual(provider.kwargs, provider_copy.kwargs)
  
          self.assertIs(dependent_provider1.cls, dependent_provider_copy1.cls)
          self.assertIsNot(dependent_provider1, dependent_provider_copy1)
  
          self.assertIs(dependent_provider2.cls, dependent_provider_copy2.cls)
          self.assertIsNot(dependent_provider2, dependent_provider_copy2)
  
      def test_deepcopy_attributes(self):
          provider = self.singleton_cls(Example)
          dependent_provider1 = self.singleton_cls(list)
          dependent_provider2 = self.singleton_cls(dict)
  
          provider.add_attributes(a1=dependent_provider1, a2=dependent_provider2)
  
          provider_copy = providers.deepcopy(provider)
          dependent_provider_copy1 = provider_copy.attributes['a1']
          dependent_provider_copy2 = provider_copy.attributes['a2']
  
          self.assertNotEqual(provider.attributes, provider_copy.attributes)
  
          self.assertIs(dependent_provider1.cls, dependent_provider_copy1.cls)
          self.assertIsNot(dependent_provider1, dependent_provider_copy1)
  
          self.assertIs(dependent_provider2.cls, dependent_provider_copy2.cls)
          self.assertIsNot(dependent_provider2, dependent_provider_copy2)
  
      def test_deepcopy_overridden(self):
          provider = self.singleton_cls(Example)
          object_provider = providers.Object(object())
  
          provider.override(object_provider)
  
          provider_copy = providers.deepcopy(provider)
          object_provider_copy = provider_copy.overridden[0]
  
          self.assertIsNot(provider, provider_copy)
          self.assertIs(provider.cls, provider_copy.cls)
          self.assertIsInstance(provider, self.singleton_cls)
  
          self.assertIsNot(object_provider, object_provider_copy)
          self.assertIsInstance(object_provider_copy, providers.Object)
  
      def test_deepcopy_with_sys_streams(self):
          provider = providers.Singleton(Example)
          provider.add_args(sys.stdin)
          provider.add_kwargs(a2=sys.stdout)
          provider.add_attributes(a3=sys.stderr)
  
          provider_copy = providers.deepcopy(provider)
  
          self.assertIsNot(provider, provider_copy)
          self.assertIsInstance(provider_copy, providers.Singleton)
          self.assertIs(provider.args[0], sys.stdin)
          self.assertIs(provider.kwargs['a2'], sys.stdout)
          self.assertIs(provider.attributes['a3'], sys.stderr)
  
      def test_reset(self):
          provider = self.singleton_cls(object)
  
          instance1 = provider()
          self.assertIsInstance(instance1, object)
  
          provider.reset()
  
          instance2 = provider()
          self.assertIsInstance(instance2, object)
  
          self.assertIsNot(instance1, instance2)
  
      def test_reset_with_singleton(self):
          dependent_singleton = providers.Singleton(object)
          provider = self.singleton_cls(dict, dependency=dependent_singleton)
  
          dependent_instance = dependent_singleton()
          instance1 = provider()
          self.assertIs(instance1['dependency'], dependent_instance)
  
          provider.reset()
  
          instance2 = provider()
          self.assertIs(instance1['dependency'], dependent_instance)
  
          self.assertIsNot(instance1, instance2)
  
      def test_reset_context_manager(self):
          singleton = self.singleton_cls(object)
  
          instance1 = singleton()
          with singleton.reset():
              instance2 = singleton()
          instance3 = singleton()
          self.assertEqual(len({instance1, instance2, instance3}), 3)
  
      def test_reset_context_manager_as_attribute(self):
          singleton = self.singleton_cls(object)
  
          with singleton.reset() as alias:
              pass
  
          self.assertIs(singleton, alias)
  
      def test_full_reset(self):
          dependent_singleton = providers.Singleton(object)
          provider = self.singleton_cls(dict, dependency=dependent_singleton)
  
          dependent_instance1 = dependent_singleton()
          instance1 = provider()
          self.assertIs(instance1['dependency'], dependent_instance1)
  
          provider.full_reset()
  
          dependent_instance2 = dependent_singleton()
          instance2 = provider()
          self.assertIsNot(instance2['dependency'], dependent_instance1)
          self.assertIsNot(dependent_instance1, dependent_instance2)
          self.assertIsNot(instance1, instance2)
  
      def test_full_reset_context_manager(self):
          class Item:
              def __init__(self, dependency):
                  self.dependency = dependency
  
          dependent_singleton = providers.Singleton(object)
          singleton = self.singleton_cls(Item, dependency=dependent_singleton)
  
          instance1 = singleton()
          with singleton.full_reset():
              instance2 = singleton()
          instance3 = singleton()
  
          self.assertEqual(len({instance1, instance2, instance3}), 3)
          self.assertEqual(
              len({instance1.dependency, instance2.dependency, instance3.dependency}),
              3,
          )
  
      def test_full_reset_context_manager_as_attribute(self):
          singleton = self.singleton_cls(object)
  
          with singleton.full_reset() as alias:
              pass
  
          self.assertIs(singleton, alias)
  
  
  class SingletonTests(_BaseSingletonTestCase, unittest.TestCase):
  
      singleton_cls = providers.Singleton
  
      def test_repr(self):
          provider = self.singleton_cls(Example)
  
          self.assertEqual(repr(provider),
                           '<dependency_injector.providers.'
                           'Singleton({0}) at {1}>'.format(
                               repr(Example),
                               hex(id(provider))))
  
  
  class DelegatedSingletonTests(_BaseSingletonTestCase, unittest.TestCase):
  
      singleton_cls = providers.DelegatedSingleton
  
      def test_is_delegated_provider(self):
          provider = self.singleton_cls(object)
          self.assertTrue(providers.is_delegated(provider))
  
      def test_repr(self):
          provider = self.singleton_cls(Example)
  
          self.assertEqual(repr(provider),
                           '<dependency_injector.providers.'
                           'DelegatedSingleton({0}) at {1}>'.format(
                               repr(Example),
                               hex(id(provider))))
  
  
  class ThreadLocalSingletonTests(_BaseSingletonTestCase, unittest.TestCase):
  
      singleton_cls = providers.ThreadLocalSingleton
  
      def test_repr(self):
          provider = providers.ThreadLocalSingleton(Example)
  
          self.assertEqual(repr(provider),
                           '<dependency_injector.providers.'
                           'ThreadLocalSingleton({0}) at {1}>'.format(
                               repr(Example),
                               hex(id(provider))))
  
      def test_reset(self):
          provider = providers.ThreadLocalSingleton(Example)
  
          instance1 = provider()
          self.assertIsInstance(instance1, Example)
  
          provider.reset()
  
          instance2 = provider()
          self.assertIsInstance(instance2, Example)
  
          self.assertIsNot(instance1, instance2)
  
      def test_reset_clean(self):
          provider = providers.ThreadLocalSingleton(Example)
          instance1 = provider()
  
          provider.reset()
          provider.reset()
  
          instance2 = provider()
          self.assertIsNot(instance1, instance2)
  
  
  class DelegatedThreadLocalSingletonTests(_BaseSingletonTestCase,
                                           unittest.TestCase):
  
      singleton_cls = providers.DelegatedThreadLocalSingleton
  
      def test_is_delegated_provider(self):
          provider = self.singleton_cls(object)
          self.assertTrue(providers.is_delegated(provider))
  
      def test_repr(self):
          provider = self.singleton_cls(Example)
  
          self.assertEqual(repr(provider),
                           '<dependency_injector.providers.'
                           'DelegatedThreadLocalSingleton({0}) at {1}>'.format(
                               repr(Example),
                               hex(id(provider))))
  
  
  class ThreadSafeSingletonTests(_BaseSingletonTestCase, unittest.TestCase):
  
      singleton_cls = providers.ThreadSafeSingleton
  
      def test_repr(self):
          provider = self.singleton_cls(Example)
  
          self.assertEqual(repr(provider),
                           '<dependency_injector.providers.'
                           'ThreadSafeSingleton({0}) at {1}>'.format(
                               repr(Example),
                               hex(id(provider))))
  
  
  class DelegatedThreadSafeSingletonTests(_BaseSingletonTestCase,
                                          unittest.TestCase):
  
      singleton_cls = providers.DelegatedThreadSafeSingleton
  
      def test_is_delegated_provider(self):
          provider = self.singleton_cls(object)
          self.assertTrue(providers.is_delegated(provider))
  
      def test_repr(self):
          provider = self.singleton_cls(Example)
  
          self.assertEqual(repr(provider),
                           '<dependency_injector.providers.'
                           'DelegatedThreadSafeSingleton({0}) at {1}>'.format(
                               repr(Example),
                               hex(id(provider))))
  
  
  class AbstractSingletonTests(unittest.TestCase):
  
      def test_inheritance(self):
          self.assertIsInstance(providers.AbstractSingleton(Example),
                                providers.BaseSingleton)
  
      def test_call_overridden_by_singleton(self):
          provider = providers.AbstractSingleton(object)
          provider.override(providers.Singleton(Example))
  
          self.assertIsInstance(provider(), Example)
  
      def test_call_overridden_by_delegated_singleton(self):
          provider = providers.AbstractSingleton(object)
          provider.override(providers.DelegatedSingleton(Example))
  
          self.assertIsInstance(provider(), Example)
  
      def test_call_not_overridden(self):
          provider = providers.AbstractSingleton(object)
  
          with self.assertRaises(errors.Error):
              provider()
  
      def test_reset_overridden(self):
          provider = providers.AbstractSingleton(object)
          provider.override(providers.Singleton(Example))
  
          instance1 = provider()
  
          provider.reset()
  
          instance2 = provider()
  
          self.assertIsNot(instance1, instance2)
          self.assertIsInstance(instance1, Example)
          self.assertIsInstance(instance2, Example)
  
      def test_reset_not_overridden(self):
          provider = providers.AbstractSingleton(object)
  
          with self.assertRaises(errors.Error):
              provider.reset()
  
      def test_override_by_not_singleton(self):
          provider = providers.AbstractSingleton(object)
  
          with self.assertRaises(errors.Error):
              provider.override(providers.Factory(object))
  
      def test_repr(self):
          provider = providers.AbstractSingleton(Example)
  
          self.assertEqual(repr(provider),
                           '<dependency_injector.providers.'
                           'AbstractSingleton({0}) at {1}>'.format(
                               repr(Example),
                               hex(id(provider))))
  
  
  class SingletonDelegateTests(unittest.TestCase):
  
      def setUp(self):
          self.delegated = providers.Singleton(Example)
          self.delegate = providers.SingletonDelegate(self.delegated)
  
      def test_is_delegate(self):
          self.assertIsInstance(self.delegate, providers.Delegate)
  
      def test_init_with_not_singleton(self):
          self.assertRaises(errors.Error,
                            providers.SingletonDelegate,
                            providers.Object(object()))
  