Fix async keyword overrides in add_kwargs

src/dependency_injector/providers.pyx

@@ -1311,9 +1311,9 @@ cdef class Callable(Provider):
 
         :return: Reference ``self``
         """
-        self._kwargs += parse_named_injections(kwargs)
-        self._kwargs_len = len(self._kwargs)
-        return self
+        existing_kwargs = self.kwargs
+        existing_kwargs.update(kwargs)
+        return self.set_kwargs(**existing_kwargs)
 
     def set_kwargs(self, **kwargs):
         """Set keyword argument injections.

tests/unit/providers/async/test_factory_py36.py

@@ -421,3 +421,30 @@ class ContainerWithAttributes(BaseContainer):
     assert service2.client.resource2 is RESOURCE2
 
     assert service1.client is not service2.client
+
+
+@mark.asyncio
+@mark.parametrize("provider_type", [providers.Callable, providers.Factory, providers.Singleton])
+@mark.parametrize("call_kwargs, expected", [({}, 20), ({"extra": 3}, 20), ({"value": 30}, 30)])
+async def test_add_kwargs_replaces_async_dependency(provider_type, call_kwargs, expected):
+    calls = []
+
+    async def original():
+        calls.append("original")
+        return 1
+
+    async def other():
+        return 2
+
+    provider = provider_type(
+        dict, value=providers.Callable(original), other=providers.Callable(other)
+    )
+    provider.add_kwargs(value=20)
+
+    result = await provider(**call_kwargs)
+
+    assert result["value"] == expected
+    assert result["other"] == 2
+    if "extra" in call_kwargs:
+        assert result["extra"] == 3
+    assert calls == []

tests/unit/providers/callables/test_callable_py2_py3.py

@@ -223,3 +223,13 @@ def test_repr():
         "<dependency_injector.providers."
         "Callable({0}) at {1}>".format(repr(example), hex(id(provider)))
     )
+
+
+def test_add_kwargs_replaces_dependency():
+    calls = []
+    original = providers.Callable(lambda: calls.append("original"))
+    provider = providers.Callable(dict, value=original, other=2)
+    provider.add_kwargs(value=20)
+
+    assert provider() == {"value": 20, "other": 2}
+    assert calls == []