Add implementation, typing stubs, and tests

Author: rmk135

src/dependency_injector/containers.c

@@ -45,6 +45,7 @@ class Container:
  def shutdown_resources(self) -> Optional[Awaitable]: ...
  def apply_container_providers_overridings(self) -> None: ...
  def reset_singletons(self) -> None: ...
+ def check_dependencies(self) -> None: ...
  @overload
  def resolve_provider_name(self, provider: Provider) -> str: ...
  @classmethod

src/dependency_injector/containers.pyi

@@ -305,6 +305,30 @@ class DynamicContainer(Container):
  for provider in self.traverse(types=[providers.BaseSingleton]):
  provider.reset()
 
+ def check_dependencies(self):
+ """Check if container dependencies are defined.
+
+ If any dependency is undefined, raises an error.
+ """
+ undefined = [
+ dependency
+ for dependency in self.traverse(types=[providers.Dependency])
+ if not dependency.is_defined
+ ]
+
+ if not undefined:
+ return
+
+ container_name = self.parent_name if self.parent_name else self.__class__.__name__
+ undefined_names = [
+ f'"{dependency.parent_name if dependency.parent_name else dependency}"'
+ for dependency in undefined
+ ]
+ raise errors.Error(
+ f'Container "{container_name}" has undefined dependencies: '
+ f'{", ".join(undefined_names)}',
+ )
+
  def resolve_provider_name(self, provider):
  """Try to resolve provider name."""
  for provider_name, container_provider in self.providers.items():