diff --git a/dependency_injector/__init__.py b/dependency_injector/__init__.py
index 56b6ac35..927246f5 100644
--- a/dependency_injector/__init__.py
+++ b/dependency_injector/__init__.py
@@ -8,15 +8,18 @@ from .catalogs import override
 
 from .providers import Provider
 from .providers import Delegate
+from .providers import Callable
+from .providers import DelegatedCallable
 from .providers import Factory
+from .providers import DelegatedFactory
 from .providers import Singleton
+from .providers import DelegatedSingleton
 from .providers import ExternalDependency
 from .providers import StaticProvider
 from .providers import Class
 from .providers import Object
 from .providers import Function
 from .providers import Value
-from .providers import Callable
 from .providers import Config
 
 from .injections import Injection
@@ -28,6 +31,7 @@ from .injections import inject
 
 from .utils import is_provider
 from .utils import ensure_is_provider
+from .utils import is_delegated_provider
 from .utils import is_injection
 from .utils import ensure_is_injection
 from .utils import is_arg_injection
@@ -65,15 +69,18 @@ __all__ = (
     # Providers
     'Provider',
     'Delegate',
+    'Callable',
+    'DelegatedCallable',
     'Factory',
+    'DelegatedFactory',
     'Singleton',
+    'DelegatedSingleton',
     'ExternalDependency',
     'StaticProvider',
     'Class',
     'Object',
     'Function',
     'Value',
-    'Callable',
     'Config',
 
     # Injections
@@ -87,6 +94,7 @@ __all__ = (
     # Utils
     'is_provider',
     'ensure_is_provider',
+    'is_delegated_provider',
     'is_injection',
     'ensure_is_injection',
     'is_arg_injection',
diff --git a/dependency_injector/injections.py b/dependency_injector/injections.py
index f2309479..3d71af48 100644
--- a/dependency_injector/injections.py
+++ b/dependency_injector/injections.py
@@ -6,6 +6,7 @@ import itertools
 import six
 
 from .utils import is_provider
+from .utils import is_delegated_provider
 from .utils import is_injection
 from .utils import is_arg_injection
 from .utils import is_kwarg_injection
@@ -32,15 +33,17 @@ class Injection(object):
 
         :type: object | :py:class:`dependency_injector.providers.Provider`
 
-    .. py:attribute:: injectable_is_provider
+    .. py:attribute:: call_injectable
 
-        Flag that is set to ``True`` if injectable value is provider.
+        Flag that is set to ``True`` if it is needed to call injectable.
+
+        Injectable needs to be called if it is not delegated provider.
 
         :type: bool
     """
 
     __IS_INJECTION__ = True
-    __slots__ = ('injectable', 'injectable_is_provider')
+    __slots__ = ('injectable', 'call_injectable')
 
     def __init__(self, injectable):
         """Initializer.
@@ -51,20 +54,21 @@ class Injection(object):
                           :py:class:`dependency_injector.providers.Provider`
         """
         self.injectable = injectable
-        self.injectable_is_provider = is_provider(injectable)
+        self.call_injectable = (is_provider(injectable) and
+                                not is_delegated_provider(injectable))
         super(Injection, self).__init__()
 
     @property
     def value(self):
         """Read-only property that represents injectable value.
 
-        Injectable values are provided "as is", except of providers
-        (subclasses of :py:class:`dependency_injector.providers.Provider`).
-        Providers will be called every time, when injection needs to be done.
+        Injectable values and delegated providers are provided "as is".
+        Other providers will be called every time, when injection needs to
+        be done.
 
         :rtype: object
         """
-        if self.injectable_is_provider:
+        if self.call_injectable:
             return self.injectable()
         return self.injectable
 
diff --git a/dependency_injector/providers.py b/dependency_injector/providers.py
index 73440d5d..46a5f14e 100644
--- a/dependency_injector/providers.py
+++ b/dependency_injector/providers.py
@@ -319,6 +319,34 @@ class Callable(Provider):
     __repr__ = __str__
 
 
+class DelegatedCallable(Callable):
+    """:py:class:`DelegatedCallable` is a delegated :py:class:`Callable`.
+
+    :py:class:`DelegatedCallable` is a :py:class:`Callable`, that is injected
+    "as is".
+
+    .. py:attribute:: provides
+
+        Provided callable.
+
+        :type: callable
+
+    .. py:attribute:: args
+
+        Tuple of positional argument injections.
+
+        :type: tuple[:py:class:`dependency_injector.injections.Arg`]
+
+    .. py:attribute:: kwargs
+
+        Tuple of keyword argument injections.
+
+        :type: tuple[:py:class:`dependency_injector.injections.KwArg`]
+    """
+
+    __IS_DELEGATED__ = True
+
+
 class Factory(Callable):
     """:py:class:`Factory` provider creates new instance on every call.
 
@@ -448,6 +476,54 @@ class Factory(Callable):
         return instance
 
 
+class DelegatedFactory(Factory):
+    """:py:class:`DelegatedFactory` is a delegated :py:class:`Factory`.
+
+    :py:class:`DelegatedFactory` is a :py:class:`Factory`, that is injected
+    "as is".
+
+    .. py:attribute:: provided_type
+
+        If provided type is defined, :py:class:`Factory` checks that
+        :py:attr:`Factory.provides` is subclass of
+        :py:attr:`Factory.provided_type`.
+
+        :type: type | None
+
+    .. py:attribute:: provides
+
+        Class or other callable that provides object.
+
+        :type: type | callable
+
+    .. py:attribute:: args
+
+        Tuple of positional argument injections.
+
+        :type: tuple[:py:class:`dependency_injector.injections.Arg`]
+
+    .. py:attribute:: kwargs
+
+        Tuple of keyword argument injections.
+
+        :type: tuple[:py:class:`dependency_injector.injections.KwArg`]
+
+    .. py:attribute:: attributes
+
+        Tuple of attribute injections.
+
+        :type: tuple[:py:class:`dependency_injector.injections.Attribute`]
+
+    .. py:attribute:: methods
+
+        Tuple of method injections.
+
+        :type: tuple[:py:class:`dependency_injector.injections.Method`]
+    """
+
+    __IS_DELEGATED__ = True
+
+
 class Singleton(Factory):
     """:py:class:`Singleton` provider returns same instance on every call.
 
@@ -556,6 +632,60 @@ class Singleton(Factory):
         return self.instance
 
 
+class DelegatedSingleton(Singleton):
+    """:py:class:`DelegatedSingleton` is a delegated :py:class:`Singleton`.
+
+    :py:class:`DelegatedSingleton` is a :py:class:`Singleton`, that is injected
+    "as is".
+
+    .. py:attribute:: provided_type
+
+        If provided type is defined, :py:class:`Factory` checks that
+        :py:attr:`Factory.provides` is subclass of
+        :py:attr:`Factory.provided_type`.
+
+        :type: type | None
+
+    .. py:attribute:: instance
+
+        Read-only reference to singleton's instance.
+
+        :type: object
+
+    .. py:attribute:: provides
+
+        Class or other callable that provides object.
+
+        :type: type | callable
+
+    .. py:attribute:: args
+
+        Tuple of positional argument injections.
+
+        :type: tuple[:py:class:`dependency_injector.injections.Arg`]
+
+    .. py:attribute:: kwargs
+
+        Tuple of keyword argument injections.
+
+        :type: tuple[:py:class:`dependency_injector.injections.KwArg`]
+
+    .. py:attribute:: attributes
+
+        Tuple of attribute injections.
+
+        :type: tuple[:py:class:`dependency_injector.injections.Attribute`]
+
+    .. py:attribute:: methods
+
+        Tuple of method injections.
+
+        :type: tuple[:py:class:`dependency_injector.injections.Method`]
+    """
+
+    __IS_DELEGATED__ = True
+
+
 @six.python_2_unicode_compatible
 class ExternalDependency(Provider):
     """:py:class:`ExternalDependency` provider describes dependency interface.
diff --git a/dependency_injector/utils.py b/dependency_injector/utils.py
index 01bb957d..569fcf71 100644
--- a/dependency_injector/utils.py
+++ b/dependency_injector/utils.py
@@ -44,6 +44,19 @@ def ensure_is_provider(instance):
     return instance
 
 
+def is_delegated_provider(instance):
+    """Check if instance is delegated provider instance.
+
+    :param instance: Instance to be checked.
+    :type instance: object
+
+    :rtype: bool
+    """
+    return (is_provider(instance) and
+            hasattr(instance, '__IS_DELEGATED__') and
+            getattr(instance, '__IS_DELEGATED__') is True)
+
+
 def is_injection(instance):
     """Check if instance is injection instance.
 
diff --git a/docs/main/changelog.rst b/docs/main/changelog.rst
index 680eb421..bd2fb032 100644
--- a/docs/main/changelog.rst
+++ b/docs/main/changelog.rst
@@ -9,7 +9,9 @@ follows `Semantic versioning`_
 
 Development version
 -------------------
-- No features.
+- Add ``DelegatedCallable`` provider.
+- Add ``DelegatedFactory`` provider.
+- Add ``DelegatedSingleton`` provider.
 
 1.12.0
 ------
diff --git a/docs/providers/callable.rst b/docs/providers/callable.rst
index 7bc6227d..0a813640 100644
--- a/docs/providers/callable.rst
+++ b/docs/providers/callable.rst
@@ -16,12 +16,17 @@ arguments that are used as decorated callable injections. Every time, when
 would be passed as an callable arguments.
 
 Such behaviour is very similar to the standard Python ``functools.partial`` 
-object, except of one thing: all injectable values are provided 
-*"as is"*, except of providers (subclasses of :py:class:`Provider`). Providers 
-will be called every time, when injection needs to be done. For example, 
-if injectable value of injection is a :py:class:`Factory`, it will provide 
-new one instance (as a result of its call) every time, when injection needs 
-to be done.
+object with several more things: 
+
++ All providers (instances of :py:class:`Provider`) are called every time 
+  when injection needs to be done.
++ Providers could be injected "as is" (delegated), if it is defined obviously.
+  Check out `Callable providers delegation`_.
++ All other injectable values are provided *"as is"*
+  
+For example, if injectable value of injection is a :py:class:`Factory`, it 
+will provide new one instance (as a result of its call) every time, when 
+injection needs to be done.
 
 :py:class:`Callable` behaviour with context positional and keyword arguments 
 is very like a standard Python ``functools.partial``:
@@ -47,6 +52,8 @@ injections:
 .. literalinclude:: ../../examples/providers/callable_kwargs.py
    :language: python
 
+.. _callable_delegation:
+
 Callable providers delegation
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -62,3 +69,12 @@ Example:
 
 .. literalinclude:: ../../examples/providers/callable_delegation.py
    :language: python
+
+Alternative way of doing :py:class:`Callable` delegation is an usage of 
+:py:class:`DelegatedCallable`. :py:class:`DelegatedCallable` is a 
+:py:class:`Callable` that is always injected "as is".
+
+Example:
+
+.. literalinclude:: ../../examples/providers/delegated_callable.py
+   :language: python
diff --git a/docs/providers/factory.rst b/docs/providers/factory.rst
index b5e250d1..818cbf1b 100644
--- a/docs/providers/factory.rst
+++ b/docs/providers/factory.rst
@@ -24,12 +24,17 @@ that are used as ``__init__()`` injections. Every time, when
 argument injections would be passed as an instance's arguments.
 
 Such behaviour is very similar to the standard Python ``functools.partial`` 
-object, except of one thing: all injectable values are provided 
-*"as is"*, except of providers (subclasses of :py:class:`Provider`). Providers 
-will be called every time, when injection needs to be done. For example, 
-if injectable value of injection is a :py:class:`Factory`, it will provide 
-new one instance (as a result of its call) every time, when injection needs 
-to be done.
+object with several more things: 
+
++ All providers (instances of :py:class:`Provider`) are called every time 
+  when injection needs to be done.
++ Providers could be injected "as is" (delegated), if it is defined obviously.
+  Check out `Factory providers delegation`_.
++ All other injectable values are provided *"as is"*
+  
+For example, if injectable value of injection is a :py:class:`Factory`, it 
+will provide new one instance (as a result of its call) every time, when 
+injection needs to be done.
 
 Example below is a little bit more complicated. It shows how to create 
 :py:class:`Factory` of particular class with ``__init__()`` argument 
@@ -175,6 +180,15 @@ Example:
 .. literalinclude:: ../../examples/providers/factory_delegation.py
    :language: python
 
+Alternative way of doing :py:class:`Factory` delegation is an usage of 
+:py:class:`DelegatedFactory`. :py:class:`DelegatedFactory` is a 
+:py:class:`Factory` that is always injected "as is".
+
+Example:
+
+.. literalinclude:: ../../examples/providers/delegated_factory.py
+   :language: python
+
 Factory providers specialization
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/docs/providers/index.rst b/docs/providers/index.rst
index 1f6a5514..0d57268a 100644
--- a/docs/providers/index.rst
+++ b/docs/providers/index.rst
@@ -24,8 +24,8 @@ Providers module API docs - :py:mod:`dependency_injector.providers`
 
     factory
     singleton
-    static
     callable
     external_dependency
+    static
     overriding
     custom
diff --git a/docs/providers/singleton.rst b/docs/providers/singleton.rst
index b005a379..db24ccfd 100644
--- a/docs/providers/singleton.rst
+++ b/docs/providers/singleton.rst
@@ -36,9 +36,10 @@ provider.
     during the first call). Be aware that such behaviour was made with opened 
     eyes and is not a bug.
 
-    By the way, in such case, :py:class:`Delegate` provider can be useful. It 
-    makes possible to inject providers *as is*. Please check out full example 
-    in *Providers delegation* section.
+    By the way, in such case, :py:class:`Delegate` or 
+    :py:class:`DelegatedSingleton` provider can be useful 
+    . It makes possible to inject providers *as is*. Please check out 
+    `Singleton providers delegation`_ section.
 
 Singleton providers resetting
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -70,6 +71,15 @@ Example:
 .. literalinclude:: ../../examples/providers/singleton_delegation.py
    :language: python
 
+Alternative way of doing :py:class:`Singleton` delegation is an usage of 
+:py:class:`DelegatedSingleton`. :py:class:`DelegatedSingleton` is a 
+:py:class:`Singleton` that is always injected "as is".
+
+Example:
+
+.. literalinclude:: ../../examples/providers/delegated_singleton.py
+   :language: python
+
 Singleton providers specialization
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/examples/providers/delegated_callable.py b/examples/providers/delegated_callable.py
new file mode 100644
index 00000000..c4ee9546
--- /dev/null
+++ b/examples/providers/delegated_callable.py
@@ -0,0 +1,22 @@
+"""`DelegatedCallable` providers example."""
+
+from dependency_injector import providers
+
+
+def command1(config):
+    """Some example command."""
+    return config['some_value'] * 5
+
+
+def command2(command1):
+    """Some example command."""
+    return command1() / 2
+
+# Creating callable providers for commands:
+command1_provider = providers.DelegatedCallable(command1,
+                                                config={'some_value': 4})
+command2_provider = providers.DelegatedCallable(command2,
+                                                command1=command1_provider)
+
+# Making some asserts:
+assert command2_provider() == 10
diff --git a/examples/providers/delegated_factory.py b/examples/providers/delegated_factory.py
new file mode 100644
index 00000000..03f6801f
--- /dev/null
+++ b/examples/providers/delegated_factory.py
@@ -0,0 +1,46 @@
+"""`DelegatedFactory` providers example."""
+
+from dependency_injector import providers
+
+
+class User(object):
+    """Example class User."""
+
+    def __init__(self, photos_factory):
+        """Initializer.
+
+        :param photos_factory: providers.Factory -> Photo
+        """
+        self.photos_factory = photos_factory
+        self._main_photo = None
+        super(User, self).__init__()
+
+    @property
+    def main_photo(self):
+        """Return user's main photo."""
+        if not self._main_photo:
+            self._main_photo = self.photos_factory()
+        return self._main_photo
+
+
+class Photo(object):
+    """Example class Photo."""
+
+# User and Photo factories:
+photos_factory = providers.DelegatedFactory(Photo)
+users_factory = providers.DelegatedFactory(User,
+                                           photos_factory=photos_factory)
+
+# Creating several User objects:
+user1 = users_factory()
+user2 = users_factory()
+
+# Making some asserts:
+assert isinstance(user1, User)
+assert isinstance(user1.main_photo, Photo)
+
+assert isinstance(user2, User)
+assert isinstance(user2.main_photo, Photo)
+
+assert user1 is not user2
+assert user1.main_photo is not user2.main_photo
diff --git a/examples/providers/delegated_singleton.py b/examples/providers/delegated_singleton.py
new file mode 100644
index 00000000..5e7a5d74
--- /dev/null
+++ b/examples/providers/delegated_singleton.py
@@ -0,0 +1,18 @@
+"""`DelegatedSingleton` providers example."""
+
+from dependency_injector import providers
+
+
+# Some delegated singleton provider:
+singleton_provider = providers.DelegatedSingleton(object)
+registry = providers.DelegatedSingleton(dict,
+                                        object1=singleton_provider,
+                                        object2=singleton_provider)
+
+# Getting several references to singleton object:
+registry = registry()
+singleton_object1 = registry['object1']()
+singleton_object2 = registry['object2']()
+
+# Making some asserts:
+assert singleton_object1 is singleton_object2
diff --git a/tests/test_providers.py b/tests/test_providers.py
index e29c2a3c..82761606 100644
--- a/tests/test_providers.py
+++ b/tests/test_providers.py
@@ -165,6 +165,136 @@ class DelegateTests(unittest.TestCase):
                              hex(id(self.delegate))))
 
 
+class CallableTests(unittest.TestCase):
+    """Callable test cases."""
+
+    def example(self, arg1, arg2, arg3, arg4):
+        """Example callback."""
+        return arg1, arg2, arg3, arg4
+
+    def test_init_with_callable(self):
+        """Test creation of provider with a callable."""
+        self.assertTrue(providers.Callable(self.example))
+
+    def test_init_with_not_callable(self):
+        """Test creation of provider with not a callable."""
+        self.assertRaises(errors.Error, providers.Callable, 123)
+
+    def test_call(self):
+        """Test call."""
+        provider = providers.Callable(lambda: True)
+        self.assertTrue(provider())
+
+    def test_call_with_positional_args(self):
+        """Test call with positional args.
+
+        New simplified syntax.
+        """
+        provider = providers.Callable(self.example, 1, 2, 3, 4)
+        self.assertTupleEqual(provider(), (1, 2, 3, 4))
+
+    def test_call_with_keyword_args(self):
+        """Test call with keyword args.
+
+        New simplified syntax.
+        """
+        provider = providers.Callable(self.example,
+                                      arg1=1,
+                                      arg2=2,
+                                      arg3=3,
+                                      arg4=4)
+        self.assertTupleEqual(provider(), (1, 2, 3, 4))
+
+    def test_call_with_positional_and_keyword_args(self):
+        """Test call with positional and keyword args.
+
+        Simplified syntax of positional and keyword arg injections.
+        """
+        provider = providers.Callable(self.example, 1, 2, arg3=3, arg4=4)
+        self.assertTupleEqual(provider(), (1, 2, 3, 4))
+
+    def test_call_with_positional_and_keyword_args_extended_syntax(self):
+        """Test call with positional and keyword args.
+
+        Extended syntax of positional and keyword arg injections.
+        """
+        provider = providers.Callable(self.example,
+                                      injections.Arg(1),
+                                      injections.Arg(2),
+                                      injections.KwArg('arg3', 3),
+                                      injections.KwArg('arg4', 4))
+        self.assertTupleEqual(provider(), (1, 2, 3, 4))
+
+    def test_call_with_context_args(self):
+        """Test call with context args."""
+        provider = providers.Callable(self.example, 1, 2)
+        self.assertTupleEqual(provider(3, 4), (1, 2, 3, 4))
+
+    def test_call_with_context_kwargs(self):
+        """Test call with context kwargs."""
+        provider = providers.Callable(self.example,
+                                      injections.KwArg('arg1', 1))
+        self.assertTupleEqual(provider(arg2=2, arg3=3, arg4=4), (1, 2, 3, 4))
+
+    def test_call_with_context_args_and_kwargs(self):
+        """Test call with context args and kwargs."""
+        provider = providers.Callable(self.example, 1)
+        self.assertTupleEqual(provider(2, arg3=3, arg4=4), (1, 2, 3, 4))
+
+    def test_call_overridden(self):
+        """Test creation of new instances on overridden provider."""
+        provider = providers.Callable(self.example)
+        provider.override(providers.Value((4, 3, 2, 1)))
+        provider.override(providers.Value((1, 2, 3, 4)))
+
+        self.assertTupleEqual(provider(), (1, 2, 3, 4))
+
+    def test_injections(self):
+        """Test getting a full list of injections using injections property."""
+        provider = providers.Callable(self.example, 1, 2, arg3=3, arg4=4)
+        self.assertEquals(len(provider.injections), 4)
+
+    def test_repr(self):
+        """Test representation of provider."""
+        provider = providers.Callable(self.example,
+                                      injections.KwArg(
+                                          'arg1',
+                                          providers.Factory(dict)),
+                                      injections.KwArg(
+                                          'arg2',
+                                          providers.Factory(list)),
+                                      injections.KwArg(
+                                          'arg3',
+                                          providers.Factory(set)),
+                                      injections.KwArg(
+                                          'arg4',
+                                          providers.Factory(tuple)))
+        self.assertEqual(repr(provider),
+                         '<dependency_injector.providers.'
+                         'Callable({0}) at {1}>'.format(
+                             repr(self.example),
+                             hex(id(provider))))
+
+
+class DelegatedCallableTests(unittest.TestCase):
+    """DelegatedCallable test cases."""
+
+    def test_inheritance(self):
+        """Test inheritance."""
+        self.assertIsInstance(providers.DelegatedCallable(len),
+                              providers.Callable)
+
+    def test_is_provider(self):
+        """Test is_provider."""
+        self.assertTrue(utils.is_provider(providers.DelegatedCallable(len)))
+
+    def test_is_delegated_provider(self):
+        """Test is_delegated_provider."""
+        self.assertTrue(utils.is_delegated_provider(
+            providers.DelegatedCallable(len)))
+        self.assertFalse(utils.is_delegated_provider(providers.Callable(len)))
+
+
 class FactoryTests(unittest.TestCase):
     """Factory test cases."""
 
@@ -419,6 +549,26 @@ class FactoryTests(unittest.TestCase):
                              hex(id(provider))))
 
 
+class DelegatedFactoryTests(unittest.TestCase):
+    """DelegatedFactory test cases."""
+
+    def test_inheritance(self):
+        """Test inheritance."""
+        self.assertIsInstance(providers.DelegatedFactory(object),
+                              providers.Factory)
+
+    def test_is_provider(self):
+        """Test is_provider."""
+        self.assertTrue(utils.is_provider(providers.DelegatedFactory(object)))
+
+    def test_is_delegated_provider(self):
+        """Test is_delegated_provider."""
+        self.assertTrue(utils.is_delegated_provider(
+            providers.DelegatedFactory(object)))
+        self.assertFalse(utils.is_delegated_provider(
+            providers.Factory(object)))
+
+
 class SingletonTests(unittest.TestCase):
     """Singleton test cases."""
 
@@ -719,115 +869,25 @@ class SingletonTests(unittest.TestCase):
                              hex(id(provider))))
 
 
-class CallableTests(unittest.TestCase):
-    """Callable test cases."""
+class DelegatedSingletonTests(unittest.TestCase):
+    """DelegatedSingleton test cases."""
 
-    def example(self, arg1, arg2, arg3, arg4):
-        """Example callback."""
-        return arg1, arg2, arg3, arg4
+    def test_inheritance(self):
+        """Test inheritance."""
+        self.assertIsInstance(providers.DelegatedSingleton(object),
+                              providers.Singleton)
 
-    def test_init_with_callable(self):
-        """Test creation of provider with a callable."""
-        self.assertTrue(providers.Callable(self.example))
+    def test_is_provider(self):
+        """Test is_provider."""
+        self.assertTrue(utils.is_provider(
+            providers.DelegatedSingleton(object)))
 
-    def test_init_with_not_callable(self):
-        """Test creation of provider with not a callable."""
-        self.assertRaises(errors.Error, providers.Callable, 123)
-
-    def test_call(self):
-        """Test call."""
-        provider = providers.Callable(lambda: True)
-        self.assertTrue(provider())
-
-    def test_call_with_positional_args(self):
-        """Test call with positional args.
-
-        New simplified syntax.
-        """
-        provider = providers.Callable(self.example, 1, 2, 3, 4)
-        self.assertTupleEqual(provider(), (1, 2, 3, 4))
-
-    def test_call_with_keyword_args(self):
-        """Test call with keyword args.
-
-        New simplified syntax.
-        """
-        provider = providers.Callable(self.example,
-                                      arg1=1,
-                                      arg2=2,
-                                      arg3=3,
-                                      arg4=4)
-        self.assertTupleEqual(provider(), (1, 2, 3, 4))
-
-    def test_call_with_positional_and_keyword_args(self):
-        """Test call with positional and keyword args.
-
-        Simplified syntax of positional and keyword arg injections.
-        """
-        provider = providers.Callable(self.example, 1, 2, arg3=3, arg4=4)
-        self.assertTupleEqual(provider(), (1, 2, 3, 4))
-
-    def test_call_with_positional_and_keyword_args_extended_syntax(self):
-        """Test call with positional and keyword args.
-
-        Extended syntax of positional and keyword arg injections.
-        """
-        provider = providers.Callable(self.example,
-                                      injections.Arg(1),
-                                      injections.Arg(2),
-                                      injections.KwArg('arg3', 3),
-                                      injections.KwArg('arg4', 4))
-        self.assertTupleEqual(provider(), (1, 2, 3, 4))
-
-    def test_call_with_context_args(self):
-        """Test call with context args."""
-        provider = providers.Callable(self.example, 1, 2)
-        self.assertTupleEqual(provider(3, 4), (1, 2, 3, 4))
-
-    def test_call_with_context_kwargs(self):
-        """Test call with context kwargs."""
-        provider = providers.Callable(self.example,
-                                      injections.KwArg('arg1', 1))
-        self.assertTupleEqual(provider(arg2=2, arg3=3, arg4=4), (1, 2, 3, 4))
-
-    def test_call_with_context_args_and_kwargs(self):
-        """Test call with context args and kwargs."""
-        provider = providers.Callable(self.example, 1)
-        self.assertTupleEqual(provider(2, arg3=3, arg4=4), (1, 2, 3, 4))
-
-    def test_call_overridden(self):
-        """Test creation of new instances on overridden provider."""
-        provider = providers.Callable(self.example)
-        provider.override(providers.Value((4, 3, 2, 1)))
-        provider.override(providers.Value((1, 2, 3, 4)))
-
-        self.assertTupleEqual(provider(), (1, 2, 3, 4))
-
-    def test_injections(self):
-        """Test getting a full list of injections using injections property."""
-        provider = providers.Callable(self.example, 1, 2, arg3=3, arg4=4)
-        self.assertEquals(len(provider.injections), 4)
-
-    def test_repr(self):
-        """Test representation of provider."""
-        provider = providers.Callable(self.example,
-                                      injections.KwArg(
-                                          'arg1',
-                                          providers.Factory(dict)),
-                                      injections.KwArg(
-                                          'arg2',
-                                          providers.Factory(list)),
-                                      injections.KwArg(
-                                          'arg3',
-                                          providers.Factory(set)),
-                                      injections.KwArg(
-                                          'arg4',
-                                          providers.Factory(tuple)))
-        self.assertEqual(repr(provider),
-                         '<dependency_injector.providers.'
-                         'Callable({0}) at {1}>'.format(
-                             repr(self.example),
-                             hex(id(provider))))
+    def test_is_delegated_provider(self):
+        """Test is_delegated_provider."""
+        self.assertTrue(utils.is_delegated_provider(
+            providers.DelegatedSingleton(object)))
+        self.assertFalse(utils.is_delegated_provider(
+            providers.Singleton(object)))
 
 
 class ExternalDependencyTests(unittest.TestCase):