Add rest of test case

mypy/stubgenc.py

@@ -11,6 +11,7 @@
 import inspect
 import keyword
 import os.path
+from contextlib import suppress
 from types import FunctionType, ModuleType
 from typing import Any, Callable, Mapping
 
@@ -497,6 +498,8 @@ def is_skipped_attribute(self, attr: str) -> bool:
                 "__firstlineno__",
                 "__static_attributes__",
                 "__annotate__",
+                "__orig_bases__",
+                "__parameters__",
             )
             or attr in self.IGNORED_DUNDERS
             or is_pybind_skipped_attribute(attr)  # For pickling
@@ -875,6 +878,10 @@ def generate_class_stub(self, class_name: str, cls: type, output: list[str]) ->
         self.dedent()
 
         bases = self.get_base_types(cls)
+        if inline_generic != "":
+            # Removes typing.Generic form bases if it exists for python3.12 inline generics
+            with suppress(ValueError):
+                bases.remove("typing.Generic")
         if bases:
             bases_str = "(%s)" % ", ".join(bases)
         else:

mypy/test/teststubgen.py

@@ -948,6 +948,14 @@ class TestClass:
     def test_generic_class(self) -> None:
         exec("class Test[A]: ...")
 
+        class TestClass[A]: ...
+
+        output: list[str] = []
+        mod = ModuleType("module", "")
+        gen = InspectionStubGenerator(mod.__name__, known_modules=[mod.__name__], module=mod)
+        gen.generate_class_stub("C", TestClass, output)
+        assert_equal(output, ["class C[A]: ..."])
+
     @unittest.skipIf(sys.version_info < (3, 12), "Inline Generics not supported before Python3.12")
     def test_inline_generic_function(self) -> None: