diff --git a/type-enum/tests/test_instantiation.py b/type-enum/tests/test_instantiation.py
index e6912f4..7b0fc26 100644
--- a/type-enum/tests/test_instantiation.py
+++ b/type-enum/tests/test_instantiation.py
@@ -77,6 +77,9 @@ def f(x: Maybe.T[int]) -> int:
         with self.assertRaises(TypeError):
             Maybe.Some[int, str](3)  # type: ignore[misc]
 
+        with self.assertRaises(TypeError):
+            Maybe.T[int, str]  # type: ignore[misc,type-arg]
+
     def test_generic_multi(self) -> None:
         U = TypeVar("U")
         V = TypeVar("V")
@@ -98,6 +101,13 @@ def f(x: E.T[str, int]) -> int:
         self.assertEqual(f(a), 3)
         self.assertEqual(repr(a), "E.A(3)")
 
+    def test_generic_without_base_class(self) -> None:
+        U = TypeVar("U")
+
+        class Maybe(TypeEnum):
+            Some: Type[Tuple[U]]  # type: ignore[valid-type]
+            Nothing: Type[Tuple[()]]
+
     def test_invalid_body(self) -> None:
         with self.assertRaises(TypeError):