diff --git a/docs/main/changelog.rst b/docs/main/changelog.rst
index ecc656bc..3df4dcef 100644
--- a/docs/main/changelog.rst
+++ b/docs/main/changelog.rst
@@ -7,6 +7,11 @@ that were made in every particular version.
 From version 0.7.6 *Dependency Injector* framework strictly 
 follows `Semantic versioning`_
 
+4.26.0
+------
+- Add wiring by string id.
+- Improve error message for ``Dependency`` provider missing attribute.
+
 4.25.1
 ------
 - Amend docs and add another example for ``@containers.copy()`` decorator.
diff --git a/docs/wiring.rst b/docs/wiring.rst
index 16126de6..195f469e 100644
--- a/docs/wiring.rst
+++ b/docs/wiring.rst
@@ -88,6 +88,82 @@ Also you can use ``Provide`` marker to inject a container.
    :emphasize-lines: 16-19
    :lines: 3-
 
+Strings identifiers
+-------------------
+
+You can use wiring with string identifiers. String identifier should match provider name in the container:
+
+.. literalinclude:: ../examples/wiring/example_string_id.py
+   :language: python
+   :emphasize-lines: 17
+   :lines: 3-
+
+With string identifiers you don't need to use a container to specify an injection.
+
+To specify an injection from a nested container use point ``.`` as a separator:
+
+.. code-block:: python
+
+   @inject
+   def foo(service: UserService = Provide['services.user']) -> None:
+       ...
+
+You can also use injection modifiers:
+
+.. code-block:: python
+
+   from dependency_injector.wiring import (
+       inject,
+       Provide,
+       as_int,
+       as_float,
+       as_,
+       required,
+       invariant,
+       provided,
+   )
+
+
+   @inject
+   def foo(value: int = Provide['config.option', as_int()]) -> None:
+       ...
+
+
+   @inject
+   def foo(value: float = Provide['config.option', as_float()]) -> None:
+       ...
+
+
+   @inject
+   def foo(value: Decimal = Provide['config.option', as_(Decimal)]) -> None:
+       ...
+
+   @inject
+   def foo(value: str = Provide['config.option', required()]) -> None:
+       ...
+
+   @inject
+   def foo(value: int = Provide['config.option', required().as_int()]) -> None:
+       ...
+
+
+   @inject
+   def foo(value: int = Provide['config.option', invariant('config.switch')]) -> None:
+       ...
+
+   @inject
+   def foo(value: int = Provide['service', provided().foo['bar'].call()]) -> None:
+       ...
+
+
+To inject a container use special identifier ``<container>``:
+
+.. code-block:: python
+
+   @inject
+   def foo(container: Container = Provide['<container>']) -> None:
+       ...
+
 Wiring with modules and packages
 --------------------------------
 
diff --git a/examples/wiring/example_string_id.py b/examples/wiring/example_string_id.py
new file mode 100644
index 00000000..c18fb4fb
--- /dev/null
+++ b/examples/wiring/example_string_id.py
@@ -0,0 +1,27 @@
+"""Wiring string id example."""
+
+import sys
+
+from dependency_injector import containers, providers
+from dependency_injector.wiring import inject, Provide
+
+
+class Service:
+    ...
+
+
+class Container(containers.DeclarativeContainer):
+
+    service = providers.Factory(Service)
+
+
+@inject
+def main(service: Service = Provide['service']) -> None:
+    ...
+
+
+if __name__ == '__main__':
+    container = Container()
+    container.wire(modules=[sys.modules[__name__]])
+
+    main()
diff --git a/src/dependency_injector/__init__.py b/src/dependency_injector/__init__.py
index 5e4629b5..46c5e9d0 100644
--- a/src/dependency_injector/__init__.py
+++ b/src/dependency_injector/__init__.py
@@ -1,6 +1,6 @@
 """Top-level package."""
 
-__version__ = '4.25.1'
+__version__ = '4.26.0'
 """Version number.
 
 :type: str
diff --git a/src/dependency_injector/providers.c b/src/dependency_injector/providers.c
index 37efd4fd..3afb77b9 100644
--- a/src/dependency_injector/providers.c
+++ b/src/dependency_injector/providers.c
@@ -3561,18 +3561,18 @@ static PyObject *__pyx_builtin_IndexError;
 static PyObject *__pyx_builtin_DeprecationWarning;
 static PyObject *__pyx_builtin_NotImplementedError;
 static PyObject *__pyx_builtin_TypeError;
-static PyObject *__pyx_builtin_hex;
 static PyObject *__pyx_builtin_AttributeError;
+static PyObject *__pyx_builtin_hex;
 static PyObject *__pyx_builtin_filter;
 static PyObject *__pyx_builtin_IOError;
 static PyObject *__pyx_builtin_ValueError;
 static PyObject *__pyx_builtin_KeyError;
 static PyObject *__pyx_builtin_StopIteration;
 static const char __pyx_k__2[] = "_";
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-static const char __pyx_k__6[] = ".";
-static const char __pyx_k__7[] = "(";
-static const char __pyx_k__8[] = "\"";
+static const char __pyx_k__5[] = "\"";
+static const char __pyx_k__6[] = "<";
+static const char __pyx_k__7[] = ".";
+static const char __pyx_k__8[] = "(";
 static const char __pyx_k__9[] = ">";
 static const char __pyx_k_at[] = ") at ";
 static const char __pyx_k_id[] = "id";
@@ -3694,7 +3694,6 @@ static const char __pyx_k_default[] = "default";
 static const char __pyx_k_environ[] = "environ";
 static const char __pyx_k_factory[] = "factory";
 static const char __pyx_k_genexpr[] = "genexpr";
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 static const char __pyx_k_im_func[] = "im_func";
 static const char __pyx_k_im_self[] = "im_self";
 static const char __pyx_k_inspect[] = "inspect";
@@ -3708,7 +3707,7 @@ static const char __pyx_k_visited[] = "visited";
 static const char __pyx_k_Callable[] = "Callable";
 static const char __pyx_k_Delegate[] = "Delegate";
 static const char __pyx_k_KeyError[] = "KeyError";
-static const char __pyx_k_Provider[] = "Provider";
+static const char __pyx_k_Provider[] = "Provider \"";
 static const char __pyx_k_Resource[] = "Resource";
 static const char __pyx_k_Selector[] = "Selector";
 static const char __pyx_k_StringIO[] = "StringIO";
@@ -3771,6 +3770,7 @@ static const char __pyx_k_IndexError[] = "IndexError";
 static const char __pyx_k_ItemGetter[] = "ItemGetter";
 static const char __pyx_k_List___get[] = "List.__get__";
 static const char __pyx_k_MethodType[] = "MethodType";
+static const char __pyx_k_Provider_2[] = "Provider";
 static const char __pyx_k_SafeLoader[] = "SafeLoader";
 static const char __pyx_k_ValueError[] = "ValueError";
 static const char __pyx_k_YamlLoader[] = "YamlLoader";
@@ -3878,6 +3878,7 @@ static const char __pyx_k_ProvidedInstance[] = "ProvidedInstance";
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 static const char __pyx_k_clear_attributes[] = "clear_attributes";
 static const char __pyx_k_copy_overridings[] = "_copy_overridings";
+static const char __pyx_k_has_no_attribute[] = "\" has no attribute \"";
 static const char __pyx_k_AbstractCoroutine[] = "AbstractCoroutine";
 static const char __pyx_k_AbstractSingleton[] = "AbstractSingleton";
 static const char __pyx_k_CoroutineDelegate[] = "CoroutineDelegate";
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 static PyObject *__pyx_n_s_PositionalInjection;
 static PyObject *__pyx_n_s_ProvidedInstance;
 static PyObject *__pyx_n_s_ProvidedInstance___get;
-static PyObject *__pyx_n_s_Provider;
+static PyObject *__pyx_kp_u_Provider;
 static PyObject *__pyx_kp_s_Provider_0_could_not_be_overridd;
 static PyObject *__pyx_kp_s_Provider_0_expected_to_get_calla;
 static PyObject *__pyx_kp_s_Provider_0_expected_to_get_corou;
 static PyObject *__pyx_kp_s_Provider_0_is_not_overridden;
+static PyObject *__pyx_n_s_Provider_2;
 static PyObject *__pyx_n_s_Provider___get;
 static PyObject *__pyx_n_s_Pyx_CFunc_object____object;
 static PyObject *__pyx_n_s_Pyx_CFunc_void____object____ob;
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 static PyObject *__pyx_n_s_get_self_name_locals_genexpr;
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 static PyObject *__pyx_n_s_getstate;
+static PyObject *__pyx_kp_u_has_no_attribute;
 static PyObject *__pyx_n_s_hex;
 static PyObject *__pyx_n_s_id;
 static PyObject *__pyx_n_s_im_class;
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   PyObject *__pyx_t_3 = NULL;
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  *         elif self.__default is not UNDEFINED:             # <<<<<<<<<<<<<<
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- *         return super().__getattr__(name)
+ *         raise AttributeError(f'Provider "{self.__class__.__name__}" has no attribute "{name}"')
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  *         elif self.__default is not UNDEFINED:
  *             return getattr(self.__default, name)             # <<<<<<<<<<<<<<
- *         return super().__getattr__(name)
+ *         raise AttributeError(f'Provider "{self.__class__.__name__}" has no attribute "{name}"')
  * 
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  *         elif self.__default is not UNDEFINED:             # <<<<<<<<<<<<<<
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- *         return super().__getattr__(name)
+ *         raise AttributeError(f'Provider "{self.__class__.__name__}" has no attribute "{name}"')
  */
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- *         return super().__getattr__(name)             # <<<<<<<<<<<<<<
+ *         raise AttributeError(f'Provider "{self.__class__.__name__}" has no attribute "{name}"')             # <<<<<<<<<<<<<<
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-    __Pyx_GIVEREF(__pyx_kp_u__8);
-    PyTuple_SET_ITEM(__pyx_t_2, 2, __pyx_kp_u__8);
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   PyTuple_SET_ITEM(__pyx_t_1, 0, __pyx_t_4);
   __pyx_t_4 = 0;
-  __Pyx_INCREF(__pyx_kp_u__7);
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@@ -83721,7 +83737,7 @@ static PyObject *__pyx_f_19dependency_injector_9providers_represent_provider(PyO
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@@ -121363,11 +121379,12 @@ static __Pyx_StringTabEntry __pyx_string_tab[] = {
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   {&__pyx_n_s_ProvidedInstance___get, __pyx_k_ProvidedInstance___get, sizeof(__pyx_k_ProvidedInstance___get), 0, 0, 1, 1},
-  {&__pyx_n_s_Provider, __pyx_k_Provider, sizeof(__pyx_k_Provider), 0, 0, 1, 1},
+  {&__pyx_kp_u_Provider, __pyx_k_Provider, sizeof(__pyx_k_Provider), 0, 1, 0, 0},
   {&__pyx_kp_s_Provider_0_could_not_be_overridd, __pyx_k_Provider_0_could_not_be_overridd, sizeof(__pyx_k_Provider_0_could_not_be_overridd), 0, 0, 1, 0},
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   {&__pyx_kp_s_Provider_0_expected_to_get_corou, __pyx_k_Provider_0_expected_to_get_corou, sizeof(__pyx_k_Provider_0_expected_to_get_corou), 0, 0, 1, 0},
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+  {&__pyx_n_s_Provider_2, __pyx_k_Provider_2, sizeof(__pyx_k_Provider_2), 0, 0, 1, 1},
   {&__pyx_n_s_Provider___get, __pyx_k_Provider___get, sizeof(__pyx_k_Provider___get), 0, 0, 1, 1},
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   {&__pyx_kp_u__5, __pyx_k__5, sizeof(__pyx_k__5), 0, 1, 0, 0},
-  {&__pyx_kp_s__6, __pyx_k__6, sizeof(__pyx_k__6), 0, 0, 1, 0},
   {&__pyx_kp_u__6, __pyx_k__6, sizeof(__pyx_k__6), 0, 1, 0, 0},
+  {&__pyx_kp_s__7, __pyx_k__7, sizeof(__pyx_k__7), 0, 0, 1, 0},
   {&__pyx_kp_u__7, __pyx_k__7, sizeof(__pyx_k__7), 0, 1, 0, 0},
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@@ -121515,8 +121532,8 @@ static __Pyx_StringTabEntry __pyx_string_tab[] = {
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-  {&__pyx_n_s_getattr, __pyx_k_getattr, sizeof(__pyx_k_getattr), 0, 0, 1, 1},
   {&__pyx_n_s_getstate, __pyx_k_getstate, sizeof(__pyx_k_getstate), 0, 0, 1, 1},
+  {&__pyx_kp_u_has_no_attribute, __pyx_k_has_no_attribute, sizeof(__pyx_k_has_no_attribute), 0, 1, 0, 0},
   {&__pyx_n_s_hex, __pyx_k_hex, sizeof(__pyx_k_hex), 0, 0, 1, 1},
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   {&__pyx_n_s_im_class, __pyx_k_im_class, sizeof(__pyx_k_im_class), 0, 0, 1, 1},
@@ -121740,8 +121757,8 @@ static CYTHON_SMALL_CODE int __Pyx_InitCachedBuiltins(void) {
   __pyx_builtin_DeprecationWarning = __Pyx_GetBuiltinName(__pyx_n_s_DeprecationWarning); if (!__pyx_builtin_DeprecationWarning) __PYX_ERR(1, 325, __pyx_L1_error)
   __pyx_builtin_NotImplementedError = __Pyx_GetBuiltinName(__pyx_n_s_NotImplementedError); if (!__pyx_builtin_NotImplementedError) __PYX_ERR(1, 385, __pyx_L1_error)
   __pyx_builtin_TypeError = __Pyx_GetBuiltinName(__pyx_n_s_TypeError); if (!__pyx_builtin_TypeError) __PYX_ERR(1, 608, __pyx_L1_error)
+  __pyx_builtin_AttributeError = __Pyx_GetBuiltinName(__pyx_n_s_AttributeError); if (!__pyx_builtin_AttributeError) __PYX_ERR(1, 688, __pyx_L1_error)
   __pyx_builtin_hex = __Pyx_GetBuiltinName(__pyx_n_s_hex); if (!__pyx_builtin_hex) __PYX_ERR(1, 696, __pyx_L1_error)
-  __pyx_builtin_AttributeError = __Pyx_GetBuiltinName(__pyx_n_s_AttributeError); if (!__pyx_builtin_AttributeError) __PYX_ERR(1, 880, __pyx_L1_error)
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@@ -122356,7 +122373,7 @@ static int __Pyx_modinit_type_init_code(void) {
   }
   #endif
   if (__Pyx_SetVtable(__pyx_type_19dependency_injector_9providers_Provider.tp_dict, __pyx_vtabptr_19dependency_injector_9providers_Provider) < 0) __PYX_ERR(1, 119, __pyx_L1_error)
-  if (PyObject_SetAttr(__pyx_m, __pyx_n_s_Provider, (PyObject *)&__pyx_type_19dependency_injector_9providers_Provider) < 0) __PYX_ERR(1, 119, __pyx_L1_error)
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s_Provider_2, (PyObject *)&__pyx_type_19dependency_injector_9providers_Provider) < 0) __PYX_ERR(1, 119, __pyx_L1_error)
   if (__Pyx_setup_reduce((PyObject*)&__pyx_type_19dependency_injector_9providers_Provider) < 0) __PYX_ERR(1, 119, __pyx_L1_error)
   __pyx_ptype_19dependency_injector_9providers_Provider = &__pyx_type_19dependency_injector_9providers_Provider;
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diff --git a/src/dependency_injector/providers.pyx b/src/dependency_injector/providers.pyx
index 9b2dcee2..7e44ffd2 100644
--- a/src/dependency_injector/providers.pyx
+++ b/src/dependency_injector/providers.pyx
@@ -685,7 +685,7 @@ cdef class Dependency(Provider):
             return getattr(self.__last_overriding, name)
         elif self.__default is not UNDEFINED:
             return getattr(self.__default, name)
-        return super().__getattr__(name)
+        raise AttributeError(f'Provider "{self.__class__.__name__}" has no attribute "{name}"')
 
     def __str__(self):
         """Return string representation of provider.
diff --git a/src/dependency_injector/wiring.py b/src/dependency_injector/wiring.py
index 205eee04..c7debfdf 100644
--- a/src/dependency_injector/wiring.py
+++ b/src/dependency_injector/wiring.py
@@ -50,6 +50,12 @@ __all__ = (
     'wire',
     'unwire',
     'inject',
+    'as_int',
+    'as_float',
+    'as_',
+    'required',
+    'invariant',
+    'provided',
     'Provide',
     'Provider',
     'Closing',
@@ -85,16 +91,23 @@ _patched_registry = Registry()
 
 class ProvidersMap:
 
+    CONTAINER_STRING_ID = '<container>'
+
     def __init__(self, container):
         self._container = container
         self._map = self._create_providers_map(
             current_container=container,
-            original_container=container.declarative_parent,
+            original_container=(
+                container.declarative_parent
+                if container.declarative_parent
+                else container
+            ),
         )
 
     def resolve_provider(
             self,
-            provider: providers.Provider,
+            provider: Union[providers.Provider, str],
+            modifier: Optional['Modifier'] = None,
     ) -> Optional[providers.Provider]:
         if isinstance(provider, providers.Delegate):
             return self._resolve_delegate(provider)
@@ -109,14 +122,29 @@ class ProvidersMap:
             return self._resolve_config_option(provider)
         elif isinstance(provider, providers.TypedConfigurationOption):
             return self._resolve_config_option(provider.option, as_=provider.provides)
+        elif isinstance(provider, str):
+            return self._resolve_string_id(provider, modifier)
         else:
             return self._resolve_provider(provider)
 
-    def _resolve_delegate(
+    def _resolve_string_id(
             self,
-            original: providers.Delegate,
+            id: str,
+            modifier: Optional['Modifier'] = None,
     ) -> Optional[providers.Provider]:
-        return self._resolve_provider(original.provides)
+        if id == self.CONTAINER_STRING_ID:
+            return self._container.__self__
+
+        provider = self._container
+        for segment in id.split('.'):
+            try:
+                provider = getattr(provider, segment)
+            except AttributeError:
+                return None
+
+        if modifier:
+            provider = modifier.modify(provider, providers_map=self)
+        return provider
 
     def _resolve_provided_instance(
             self,
@@ -151,6 +179,12 @@ class ProvidersMap:
 
         return new
 
+    def _resolve_delegate(
+            self,
+            original: providers.Delegate,
+    ) -> Optional[providers.Provider]:
+        return self._resolve_provider(original.provides)
+
     def _resolve_config_option(
             self,
             original: providers.ConfigurationOption,
@@ -184,7 +218,7 @@ class ProvidersMap:
         try:
             return self._map[original]
         except KeyError:
-            pass
+            return None
 
     @classmethod
     def _create_providers_map(
@@ -381,7 +415,7 @@ def _fetch_reference_injections(
 
 def _bind_injections(fn: Callable[..., Any], providers_map: ProvidersMap) -> None:
     for injection, marker in fn.__reference_injections__.items():
-        provider = providers_map.resolve_provider(marker.provider)
+        provider = providers_map.resolve_provider(marker.provider, marker.modifier)
 
         if provider is None:
             continue
@@ -516,20 +550,161 @@ def _is_declarative_container(instance: Any) -> bool:
             and getattr(instance, 'declarative_parent', None) is None)
 
 
+class Modifier:
+
+    def modify(
+            self,
+            provider: providers.ConfigurationOption,
+            providers_map: ProvidersMap,
+    ) -> providers.Provider:
+        ...
+
+
+class TypeModifier(Modifier):
+
+    def __init__(self, type_: Type):
+        self.type_ = type_
+
+    def modify(
+            self,
+            provider: providers.ConfigurationOption,
+            providers_map: ProvidersMap,
+    ) -> providers.Provider:
+        return provider.as_(self.type_)
+
+
+def as_int() -> TypeModifier:
+    """Return int type modifier."""
+    return TypeModifier(int)
+
+
+def as_float() -> TypeModifier:
+    """Return float type modifier."""
+    return TypeModifier(float)
+
+
+def as_(type_: Type) -> TypeModifier:
+    """Return custom type modifier."""
+    return TypeModifier(type_)
+
+
+class RequiredModifier(Modifier):
+
+    def __init__(self):
+        self.type_modifier = None
+
+    def as_int(self) -> 'RequiredModifier':
+        self.type_modifier = TypeModifier(int)
+        return self
+
+    def as_float(self) -> 'RequiredModifier':
+        self.type_modifier = TypeModifier(float)
+        return self
+
+    def as_(self, type_: Type) -> 'RequiredModifier':
+        self.type_modifier = TypeModifier(type_)
+        return self
+
+    def modify(
+            self,
+            provider: providers.ConfigurationOption,
+            providers_map: ProvidersMap,
+    ) -> providers.Provider:
+        provider = provider.required()
+        if self.type_modifier:
+            provider = provider.as_(self.type_modifier.type_)
+        return provider
+
+
+def required() -> RequiredModifier:
+    """Return required modifier."""
+    return RequiredModifier()
+
+
+class InvariantModifier(Modifier):
+
+    def __init__(self, id: str) -> None:
+        self.id = id
+
+    def modify(
+            self,
+            provider: providers.ConfigurationOption,
+            providers_map: ProvidersMap,
+    ) -> providers.Provider:
+        invariant_segment = providers_map.resolve_provider(self.id)
+        return provider[invariant_segment]
+
+
+def invariant(id: str) -> InvariantModifier:
+    """Return invariant modifier."""
+    return InvariantModifier(id)
+
+
+class ProvidedInstance(Modifier):
+
+    TYPE_ATTRIBUTE = 'attr'
+    TYPE_ITEM = 'item'
+    TYPE_CALL = 'call'
+
+    def __init__(self):
+        self.segments = []
+
+    def __getattr__(self, item):
+        self.segments.append((self.TYPE_ATTRIBUTE, item))
+        return self
+
+    def __getitem__(self, item):
+        self.segments.append((self.TYPE_ITEM, item))
+        return self
+
+    def call(self):
+        self.segments.append((self.TYPE_CALL, None))
+        return self
+
+    def modify(
+            self,
+            provider: providers.ConfigurationOption,
+            providers_map: ProvidersMap,
+    ) -> providers.Provider:
+        provider = provider.provided
+        for type_, value in self.segments:
+            if type_ == ProvidedInstance.TYPE_ATTRIBUTE:
+                provider = getattr(provider, value)
+            elif type_ == ProvidedInstance.TYPE_ITEM:
+                provider = provider[value]
+            elif type_ == ProvidedInstance.TYPE_CALL:
+                provider = provider.call()
+        return provider
+
+
+def provided() -> ProvidedInstance:
+    """Return provided instance modifier."""
+    return ProvidedInstance()
+
+
 class ClassGetItemMeta(GenericMeta):
     def __getitem__(cls, item):
         # Spike for Python 3.6
+        if isinstance(item, tuple):
+            return cls(*item)
         return cls(item)
 
 
 class _Marker(Generic[T], metaclass=ClassGetItemMeta):
 
-    def __init__(self, provider: Union[providers.Provider, Container]) -> None:
+    def __init__(
+            self,
+            provider: Union[providers.Provider, Container, str],
+            modifier: Optional[Modifier] = None,
+    ) -> None:
         if _is_declarative_container(provider):
             provider = provider.__self__
-        self.provider: providers.Provider = provider
+        self.provider = provider
+        self.modifier = modifier
 
     def __class_getitem__(cls, item) -> T:
+        if isinstance(item, tuple):
+            return cls(*item)
         return cls(item)
 
     def __call__(self) -> T:
diff --git a/tests/unit/samples/wiringstringidssamples/__init__.py b/tests/unit/samples/wiringstringidssamples/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/unit/samples/wiringstringidssamples/asyncinjections.py b/tests/unit/samples/wiringstringidssamples/asyncinjections.py
new file mode 100644
index 00000000..6ea88eb2
--- /dev/null
+++ b/tests/unit/samples/wiringstringidssamples/asyncinjections.py
@@ -0,0 +1,50 @@
+import asyncio
+
+from dependency_injector import containers, providers
+from dependency_injector.wiring import inject, Provide, Closing
+
+
+class TestResource:
+    def __init__(self):
+        self.init_counter = 0
+        self.shutdown_counter = 0
+
+    def reset_counters(self):
+        self.init_counter = 0
+        self.shutdown_counter = 0
+
+
+resource1 = TestResource()
+resource2 = TestResource()
+
+
+async def async_resource(resource):
+    await asyncio.sleep(0.001)
+    resource.init_counter += 1
+
+    yield resource
+
+    await asyncio.sleep(0.001)
+    resource.shutdown_counter += 1
+
+
+class Container(containers.DeclarativeContainer):
+
+    resource1 = providers.Resource(async_resource, providers.Object(resource1))
+    resource2 = providers.Resource(async_resource, providers.Object(resource2))
+
+
+@inject
+async def async_injection(
+        resource1: object = Provide['resource1'],
+        resource2: object = Provide['resource2'],
+):
+    return resource1, resource2
+
+
+@inject
+async def async_injection_with_closing(
+        resource1: object = Closing[Provide['resource1']],
+        resource2: object = Closing[Provide['resource2']],
+):
+    return resource1, resource2
diff --git a/tests/unit/samples/wiringstringidssamples/container.py b/tests/unit/samples/wiringstringidssamples/container.py
new file mode 100644
index 00000000..95681dbf
--- /dev/null
+++ b/tests/unit/samples/wiringstringidssamples/container.py
@@ -0,0 +1,17 @@
+from dependency_injector import containers, providers
+
+from .service import Service
+
+
+class SubContainer(containers.DeclarativeContainer):
+
+    int_object = providers.Object(1)
+
+
+class Container(containers.DeclarativeContainer):
+
+    config = providers.Configuration()
+
+    service = providers.Factory(Service)
+
+    sub = providers.Container(SubContainer)
diff --git a/tests/unit/samples/wiringstringidssamples/module.py b/tests/unit/samples/wiringstringidssamples/module.py
new file mode 100644
index 00000000..f83a0a27
--- /dev/null
+++ b/tests/unit/samples/wiringstringidssamples/module.py
@@ -0,0 +1,116 @@
+"""Test module for wiring."""
+
+from decimal import Decimal
+from typing import Callable
+
+from dependency_injector.wiring import inject, Provide, Provider, as_int, as_, required, invariant, provided
+
+from .container import Container
+from .service import Service
+
+
+class TestClass:
+
+    @inject
+    def __init__(self, service: Service = Provide['service']):
+        self.service = service
+
+    @inject
+    def method(self, service: Service = Provide['service']):
+        return service
+
+    @classmethod
+    @inject
+    def class_method(cls, service: Service = Provide['service']):
+        return service
+
+    @staticmethod
+    @inject
+    def static_method(service: Service = Provide['service']):
+        return service
+
+
+@inject
+def test_function(service: Service = Provide['service']):
+    return service
+
+
+@inject
+def test_function_provider(service_provider: Callable[..., Service] = Provider['service']):
+    service = service_provider()
+    return service
+
+
+@inject
+def test_config_value(
+        value_int: int = Provide['config.a.b.c', as_int()],
+        value_str: str = Provide['config.a.b.c', as_(str)],
+        value_decimal: Decimal = Provide['config.a.b.c', as_(Decimal)],
+        value_required: str = Provide['config.a.b.c', required()],
+        value_required_int: int = Provide['config.a.b.c', required().as_int()],
+        value_required_str: str = Provide['config.a.b.c', required().as_(str)],
+        value_required_decimal: str = Provide['config.a.b.c', required().as_(Decimal)],
+):
+    return (
+        value_int,
+        value_str,
+        value_decimal,
+        value_required,
+        value_required_int,
+        value_required_str,
+        value_required_decimal,
+    )
+
+
+@inject
+def test_config_value_required_undefined(
+        value_required: int = Provide['config.a.b.c', required()],
+):
+    return value_required
+
+
+@inject
+def test_provide_provider(service_provider: Callable[..., Service] = Provide['service.provider']):
+    service = service_provider()
+    return service
+
+
+@inject
+def test_provided_instance(some_value: int = Provide['service', provided().foo['bar'].call()]):
+    return some_value
+
+
+@inject
+def test_subcontainer_provider(some_value: int = Provide['sub.int_object']):
+    return some_value
+
+
+@inject
+def test_config_invariant(some_value: int = Provide['config.option', invariant('config.switch')]):
+    return some_value
+
+
+@inject
+def test_provide_from_different_containers(
+        service: Service = Provide['service'],
+        some_value: int = Provide['int_object'],
+):
+    return service, some_value
+
+
+class ClassDecorator:
+    def __init__(self, fn):
+        self._fn = fn
+
+    def __call__(self, *args, **kwargs):
+        return self._fn(*args, **kwargs)
+
+
+@ClassDecorator
+@inject
+def test_class_decorator(service: Service = Provide['service']):
+    return service
+
+
+def test_container(container: Container = Provide['<container>']):
+    return container.service()
diff --git a/tests/unit/samples/wiringstringidssamples/package/__init__.py b/tests/unit/samples/wiringstringidssamples/package/__init__.py
new file mode 100644
index 00000000..bdc34ed2
--- /dev/null
+++ b/tests/unit/samples/wiringstringidssamples/package/__init__.py
@@ -0,0 +1,11 @@
+import sys
+
+if sys.version_info >= (3, 6):
+    from dependency_injector.wiring import Provide
+
+    from ..container import Container
+    from ..service import Service
+
+
+    def test_package_function(service: Service = Provide[Container.service]):
+        return service
diff --git a/tests/unit/samples/wiringstringidssamples/package/subpackage/__init__.py b/tests/unit/samples/wiringstringidssamples/package/subpackage/__init__.py
new file mode 100644
index 00000000..b2d3278b
--- /dev/null
+++ b/tests/unit/samples/wiringstringidssamples/package/subpackage/__init__.py
@@ -0,0 +1,11 @@
+import sys
+
+if sys.version_info >= (3, 6):
+    from dependency_injector.wiring import Provide
+
+    from ...container import Container
+    from ...service import Service
+
+
+    def test_package_function(service: Service = Provide[Container.service]):
+        return service
diff --git a/tests/unit/samples/wiringstringidssamples/package/subpackage/submodule.py b/tests/unit/samples/wiringstringidssamples/package/subpackage/submodule.py
new file mode 100644
index 00000000..5723eb4a
--- /dev/null
+++ b/tests/unit/samples/wiringstringidssamples/package/subpackage/submodule.py
@@ -0,0 +1,8 @@
+from dependency_injector.wiring import inject, Provide
+
+from ...service import Service
+
+
+@inject
+def test_function(service: Service = Provide['service']):
+    return service
diff --git a/tests/unit/samples/wiringstringidssamples/resourceclosing.py b/tests/unit/samples/wiringstringidssamples/resourceclosing.py
new file mode 100644
index 00000000..b8984665
--- /dev/null
+++ b/tests/unit/samples/wiringstringidssamples/resourceclosing.py
@@ -0,0 +1,37 @@
+from dependency_injector import containers, providers
+from dependency_injector.wiring import inject, Provide, Closing
+
+
+class Service:
+    init_counter: int = 0
+    shutdown_counter: int = 0
+
+    @classmethod
+    def reset_counter(cls):
+        cls.init_counter = 0
+        cls.shutdown_counter = 0
+
+    @classmethod
+    def init(cls):
+        cls.init_counter += 1
+
+    @classmethod
+    def shutdown(cls):
+        cls.shutdown_counter += 1
+
+
+def init_service():
+    service = Service()
+    service.init()
+    yield service
+    service.shutdown()
+
+
+class Container(containers.DeclarativeContainer):
+
+    service = providers.Resource(init_service)
+
+
+@inject
+def test_function(service: Service = Closing[Provide['service']]):
+    return service
diff --git a/tests/unit/samples/wiringstringidssamples/service.py b/tests/unit/samples/wiringstringidssamples/service.py
new file mode 100644
index 00000000..4151b94f
--- /dev/null
+++ b/tests/unit/samples/wiringstringidssamples/service.py
@@ -0,0 +1,2 @@
+class Service:
+    service_attr: int
diff --git a/tests/unit/wiring/test_wiring_py36.py b/tests/unit/wiring/test_wiring_py36.py
index 25f4b9f2..064aed9b 100644
--- a/tests/unit/wiring/test_wiring_py36.py
+++ b/tests/unit/wiring/test_wiring_py36.py
@@ -169,6 +169,9 @@ class WiringTest(unittest.TestCase):
         }
         self.container.config.from_dict(config)
 
+        value_default = module.test_config_invariant()
+        self.assertEqual(value_default, 1)
+
         with self.container.config.switch.override('a'):
             value_a = module.test_config_invariant()
         self.assertEqual(value_a, 1)
diff --git a/tests/unit/wiring/test_wiring_string_ids_py36.py b/tests/unit/wiring/test_wiring_string_ids_py36.py
new file mode 100644
index 00000000..b4d41b3b
--- /dev/null
+++ b/tests/unit/wiring/test_wiring_string_ids_py36.py
@@ -0,0 +1,391 @@
+import contextlib
+from decimal import Decimal
+import importlib
+import unittest
+
+from dependency_injector.wiring import (
+    wire,
+    Provide,
+    Closing,
+    register_loader_containers,
+    unregister_loader_containers,
+)
+from dependency_injector import errors
+
+# Runtime import to avoid syntax errors in samples on Python < 3.5
+import os
+_TOP_DIR = os.path.abspath(
+    os.path.sep.join((
+        os.path.dirname(__file__),
+        '../',
+    )),
+)
+_SAMPLES_DIR = os.path.abspath(
+    os.path.sep.join((
+        os.path.dirname(__file__),
+        '../samples/',
+    )),
+)
+import sys
+sys.path.append(_TOP_DIR)
+sys.path.append(_SAMPLES_DIR)
+
+from asyncutils import AsyncTestCase
+
+from wiringstringidssamples import module, package
+from wiringstringidssamples.service import Service
+from wiringstringidssamples.container import Container, SubContainer
+
+
+class WiringTest(unittest.TestCase):
+
+    container: Container
+
+    def setUp(self) -> None:
+        self.container = Container(config={'a': {'b': {'c': 10}}})
+        self.container.wire(
+            modules=[module],
+            packages=[package],
+        )
+        self.addCleanup(self.container.unwire)
+
+    def test_package_lookup(self):
+        from wiringstringidssamples.package import test_package_function
+        service = test_package_function()
+        self.assertIsInstance(service, Service)
+
+    def test_package_subpackage_lookup(self):
+        from wiringstringidssamples.package.subpackage import test_package_function
+        service = test_package_function()
+        self.assertIsInstance(service, Service)
+
+    def test_package_submodule_lookup(self):
+        from wiringstringidssamples.package.subpackage.submodule import test_function
+        service = test_function()
+        self.assertIsInstance(service, Service)
+
+    def test_class_wiring(self):
+        test_class_object = module.TestClass()
+        self.assertIsInstance(test_class_object.service, Service)
+
+    def test_class_wiring_context_arg(self):
+        test_service = self.container.service()
+
+        test_class_object = module.TestClass(service=test_service)
+        self.assertIs(test_class_object.service, test_service)
+
+    def test_class_method_wiring(self):
+        test_class_object = module.TestClass()
+        service = test_class_object.method()
+        self.assertIsInstance(service, Service)
+
+    def test_class_classmethod_wiring(self):
+        service = module.TestClass.class_method()
+        self.assertIsInstance(service, Service)
+
+    def test_instance_classmethod_wiring(self):
+        instance = module.TestClass()
+        service = instance.class_method()
+        self.assertIsInstance(service, Service)
+
+    def test_class_staticmethod_wiring(self):
+        service = module.TestClass.static_method()
+        self.assertIsInstance(service, Service)
+
+    def test_instance_staticmethod_wiring(self):
+        instance = module.TestClass()
+        service = instance.static_method()
+        self.assertIsInstance(service, Service)
+
+    def test_function_wiring(self):
+        service = module.test_function()
+        self.assertIsInstance(service, Service)
+
+    def test_function_wiring_context_arg(self):
+        test_service = self.container.service()
+
+        service = module.test_function(service=test_service)
+        self.assertIs(service, test_service)
+
+    def test_function_wiring_provider(self):
+        service = module.test_function_provider()
+        self.assertIsInstance(service, Service)
+
+    def test_function_wiring_provider_context_arg(self):
+        test_service = self.container.service()
+
+        service = module.test_function_provider(service_provider=lambda: test_service)
+        self.assertIs(service, test_service)
+
+    def test_configuration_option(self):
+        (
+            value_int,
+            value_str,
+            value_decimal,
+            value_required,
+            value_required_int,
+            value_required_str,
+            value_required_decimal,
+        ) = module.test_config_value()
+
+        self.assertEqual(value_int, 10)
+        self.assertEqual(value_str, '10')
+        self.assertEqual(value_decimal, Decimal(10))
+        self.assertEqual(value_required, 10)
+        self.assertEqual(value_required_int, 10)
+        self.assertEqual(value_required_str, '10')
+        self.assertEqual(value_required_decimal, Decimal(10))
+
+    def test_configuration_option_required_undefined(self):
+        self.container.config.reset_override()
+        with self.assertRaisesRegex(errors.Error, 'Undefined configuration option "config.a.b.c"'):
+            module.test_config_value_required_undefined()
+
+    def test_provide_provider(self):
+        service = module.test_provide_provider()
+        self.assertIsInstance(service, Service)
+
+    def test_provided_instance(self):
+        class TestService:
+            foo = {
+                'bar': lambda: 10,
+            }
+
+        with self.container.service.override(TestService()):
+            some_value = module.test_provided_instance()
+        self.assertEqual(some_value, 10)
+
+    def test_subcontainer(self):
+        some_value = module.test_subcontainer_provider()
+        self.assertEqual(some_value, 1)
+
+    def test_config_invariant(self):
+        config = {
+            'option': {
+                'a': 1,
+                'b': 2,
+            },
+            'switch': 'a',
+        }
+        self.container.config.from_dict(config)
+
+        value_default = module.test_config_invariant()
+        self.assertEqual(value_default, 1)
+
+        with self.container.config.switch.override('a'):
+            value_a = module.test_config_invariant()
+        self.assertEqual(value_a, 1)
+
+        with self.container.config.switch.override('b'):
+            value_b = module.test_config_invariant()
+        self.assertEqual(value_b, 2)
+
+    def test_wire_with_class_error(self):
+        with self.assertRaises(Exception):
+            wire(
+                container=Container,
+                modules=[module],
+            )
+
+    def test_unwire_function(self):
+        self.container.unwire()
+        self.assertIsInstance(module.test_function(), Provide)
+
+    def test_unwire_class(self):
+        self.container.unwire()
+        test_class_object = module.TestClass()
+        self.assertIsInstance(test_class_object.service, Provide)
+
+    def test_unwire_class_method(self):
+        self.container.unwire()
+        test_class_object = module.TestClass()
+        self.assertIsInstance(test_class_object.method(), Provide)
+
+    def test_unwire_package_function(self):
+        self.container.unwire()
+        from wiringstringidssamples.package.subpackage.submodule import test_function
+        self.assertIsInstance(test_function(), Provide)
+
+    def test_unwire_package_function_by_reference(self):
+        from wiringstringidssamples.package.subpackage import submodule
+        self.container.unwire()
+        self.assertIsInstance(submodule.test_function(), Provide)
+
+    def test_wire_multiple_containers(self):
+        sub_container = SubContainer()
+        sub_container.wire(
+            modules=[module],
+            packages=[package],
+        )
+        self.addCleanup(sub_container.unwire)
+
+        service, some_value = module.test_provide_from_different_containers()
+
+        self.assertIsInstance(service, Service)
+        self.assertEqual(some_value, 1)
+
+    def test_closing_resource(self):
+        from wiringstringidssamples import resourceclosing
+
+        resourceclosing.Service.reset_counter()
+
+        container = resourceclosing.Container()
+        container.wire(modules=[resourceclosing])
+        self.addCleanup(container.unwire)
+
+        result_1 = resourceclosing.test_function()
+        self.assertIsInstance(result_1, resourceclosing.Service)
+        self.assertEqual(result_1.init_counter, 1)
+        self.assertEqual(result_1.shutdown_counter, 1)
+
+        result_2 = resourceclosing.test_function()
+        self.assertIsInstance(result_2, resourceclosing.Service)
+        self.assertEqual(result_2.init_counter, 2)
+        self.assertEqual(result_2.shutdown_counter, 2)
+
+        self.assertIsNot(result_1, result_2)
+
+    def test_closing_resource_context(self):
+        from wiringstringidssamples import resourceclosing
+
+        resourceclosing.Service.reset_counter()
+        service = resourceclosing.Service()
+
+        container = resourceclosing.Container()
+        container.wire(modules=[resourceclosing])
+        self.addCleanup(container.unwire)
+
+        result_1 = resourceclosing.test_function(service=service)
+        self.assertIs(result_1, service)
+        self.assertEqual(result_1.init_counter, 0)
+        self.assertEqual(result_1.shutdown_counter, 0)
+
+        result_2 = resourceclosing.test_function(service=service)
+        self.assertIs(result_2, service)
+        self.assertEqual(result_2.init_counter, 0)
+        self.assertEqual(result_2.shutdown_counter, 0)
+
+    def test_class_decorator(self):
+        service = module.test_class_decorator()
+        self.assertIsInstance(service, Service)
+
+    def test_container(self):
+        service = module.test_container()
+        self.assertIsInstance(service, Service)
+
+
+class WiringAndFastAPITest(unittest.TestCase):
+
+    container: Container
+
+    def test_bypass_marker_injection(self):
+        container = Container()
+        container.wire(modules=[module])
+        self.addCleanup(container.unwire)
+
+        service = module.test_function(service=Provide[Container.service])
+        self.assertIsInstance(service, Service)
+
+    def test_closing_resource_bypass_marker_injection(self):
+        from wiringstringidssamples import resourceclosing
+
+        resourceclosing.Service.reset_counter()
+
+        container = resourceclosing.Container()
+        container.wire(modules=[resourceclosing])
+        self.addCleanup(container.unwire)
+
+        result_1 = resourceclosing.test_function(
+            service=Closing[Provide[resourceclosing.Container.service]],
+        )
+        self.assertIsInstance(result_1, resourceclosing.Service)
+        self.assertEqual(result_1.init_counter, 1)
+        self.assertEqual(result_1.shutdown_counter, 1)
+
+        result_2 = resourceclosing.test_function(
+            service=Closing[Provide[resourceclosing.Container.service]],
+        )
+        self.assertIsInstance(result_2, resourceclosing.Service)
+        self.assertEqual(result_2.init_counter, 2)
+        self.assertEqual(result_2.shutdown_counter, 2)
+
+        self.assertIsNot(result_1, result_2)
+
+
+class WiringAsyncInjectionsTest(AsyncTestCase):
+
+    def test_async_injections(self):
+        from wiringstringidssamples import asyncinjections
+
+        container = asyncinjections.Container()
+        container.wire(modules=[asyncinjections])
+        self.addCleanup(container.unwire)
+
+        asyncinjections.resource1.reset_counters()
+        asyncinjections.resource2.reset_counters()
+
+        resource1, resource2 = self._run(asyncinjections.async_injection())
+
+        self.assertIs(resource1, asyncinjections.resource1)
+        self.assertEqual(asyncinjections.resource1.init_counter, 1)
+        self.assertEqual(asyncinjections.resource1.shutdown_counter, 0)
+
+        self.assertIs(resource2, asyncinjections.resource2)
+        self.assertEqual(asyncinjections.resource2.init_counter, 1)
+        self.assertEqual(asyncinjections.resource2.shutdown_counter, 0)
+
+    def test_async_injections_with_closing(self):
+        from wiringstringidssamples import asyncinjections
+
+        container = asyncinjections.Container()
+        container.wire(modules=[asyncinjections])
+        self.addCleanup(container.unwire)
+
+        asyncinjections.resource1.reset_counters()
+        asyncinjections.resource2.reset_counters()
+
+        resource1, resource2 = self._run(asyncinjections.async_injection_with_closing())
+
+        self.assertIs(resource1, asyncinjections.resource1)
+        self.assertEqual(asyncinjections.resource1.init_counter, 1)
+        self.assertEqual(asyncinjections.resource1.shutdown_counter, 1)
+
+        self.assertIs(resource2, asyncinjections.resource2)
+        self.assertEqual(asyncinjections.resource2.init_counter, 1)
+        self.assertEqual(asyncinjections.resource2.shutdown_counter, 1)
+
+        resource1, resource2 = self._run(asyncinjections.async_injection_with_closing())
+
+        self.assertIs(resource1, asyncinjections.resource1)
+        self.assertEqual(asyncinjections.resource1.init_counter, 2)
+        self.assertEqual(asyncinjections.resource1.shutdown_counter, 2)
+
+        self.assertIs(resource2, asyncinjections.resource2)
+        self.assertEqual(asyncinjections.resource2.init_counter, 2)
+        self.assertEqual(asyncinjections.resource2.shutdown_counter, 2)
+
+
+# class AutoLoaderTest(unittest.TestCase):
+#
+#     container: Container
+#
+#     def setUp(self) -> None:
+#         self.container = Container(config={'a': {'b': {'c': 10}}})
+#         importlib.reload(module)
+#
+#     def tearDown(self) -> None:
+#         with contextlib.suppress(ValueError):
+#             unregister_loader_containers(self.container)
+#
+#         self.container.unwire()
+#
+#     @classmethod
+#     def tearDownClass(cls) -> None:
+#         importlib.reload(module)
+#
+#     def test_register_container(self):
+#         register_loader_containers(self.container)
+#         importlib.reload(module)
+#
+#         service = module.test_function()
+#         self.assertIsInstance(service, Service)