Add test with inheritance

Author: sterliakov

test-data/unit/check-functions.test

@@ -3501,4 +3501,12 @@ def key2(x: int) -> None:
 @decorator2(key2)  # E: Argument 1 has incompatible type "Callable[[Arg(int, 'y')], Coroutine[Any, Any, None]]"; expected "Callable[[Arg(int, 'x')], Awaitable[None]]"
 async def foo2(y: int) -> None:
     ...
+
+class Parent:
+    def method_without(self) -> "Parent": ...
+    def method_with(self, param: str) -> "Parent": ...
+
+class Child(Parent):
+    method_without: Callable[["Child"], "Child"]
+    method_with: Callable[["Child", str], "Child"]  # E: Incompatible types in assignment (expression has type "Callable[[str], Child]", base class "Parent" defined the type as "Callable[[Arg(str, 'param')], Parent]")
 [builtins fixtures/tuple.pyi]