Test generic class as well

Author: ilevkivskyi

test-data/unit/check-classes.test

@@ -8781,8 +8781,19 @@ C().bar = "fine"
 [builtins fixtures/property.pyi]
 
 [case testCorrectConstructorTypeWithAnyFallback]
+from typing import Generic, TypeVar
+
 class B(Unknown):  # type: ignore
     def __init__(self) -> None: ...
 class C(B): ...
 
 reveal_type(C)  # N: Revealed type is "def () -> __main__.C"
+
+T = TypeVar("T")
+class BG(Generic[T], Unknown):  # type: ignore
+    def __init__(self) -> None: ...
+class CGI(BG[int]): ...
+class CGT(BG[T]): ...
+
+reveal_type(CGI)  # N: Revealed type is "def () -> __main__.CGI"
+reveal_type(CGT)  # N: Revealed type is "def [T] () -> __main__.CGT[T`1]"