python-dependency-injector/tests/typing/dependency.py

from typing import Type

from dependency_injector import providers


class Animal:
    ...


class Cat(Animal):

    def __init__(self, *_, **__): ...


# Test 1: to check the return type
provider1 = providers.Dependency(instance_of=Animal)
provider1.override(providers.Factory(Cat))
var1: Animal = provider1()

# Test 2: to check the return type
provider2 = providers.Dependency(instance_of=Animal)
var2: Type[Animal] = provider2.instance_of

# Test 3: to check the return type with await
provider3 = providers.Dependency(instance_of=Animal)
async def _async3() -> None:
    var1: Animal = await provider3()  # type: ignore
    var2: Animal = await provider3.async_()