================
@@ -44,8 +46,53 @@ def test_from_id(self):
 
     def test_duplicate_ids(self):
         """Check that no two kinds have the same id"""
-        # for enum in self.enums:
         for enum in self.enums:
             num_declared_variants = len(enum._member_map_.keys())
             num_unique_variants = len(list(enum))
             self.assertEqual(num_declared_variants, num_unique_variants)
+
+    def test_all_variants(self):
+        """Check that all libclang enum values are also defined in cindex"""
+        cenum_to_pythonenum = {
+            "CX_CXXAccessSpecifier": AccessSpecifier,
+            "CXAvailabilityKind": AvailabilityKind,
+            "CXBinaryOperatorKind": BinaryOperator,
+            "CXCursorKind": CursorKind,
+            "CXCursor_ExceptionSpecificationKind": ExceptionSpecificationKind,
+            "CXLinkageKind": LinkageKind,
+            "CXRefQualifierKind": RefQualifierKind,
+            "CX_StorageClass": StorageClass,
+            "CXTemplateArgumentKind": TemplateArgumentKind,
+            "CXTLSKind": TLSKind,
+            "CXTokenKind": TokenKind,
+            "CXTypeKind": TypeKind,
+        }
+
+        indexheader = (
+            Path(__file__).parent.parent.parent.parent.parent
+            / "include/clang-c/Index.h"
+        )
+        tu = TranslationUnit.from_source(indexheader, ["-x", "c++"])
+
+        enum_variant_map = {}
+        # For all enums in self.enums, extract all enum variants defined in 
Index.h
+        for cursor in tu.cursor.walk_preorder():
+            type_class = cenum_to_pythonenum.get(cursor.type.spelling)
+            if (
+                cursor.kind == CursorKind.ENUM_CONSTANT_DECL
+                and type_class in self.enums
----------------
DeinAlptraum wrote:

> can we replace the registry of enums that contributors and reviewers are 
> prone to forget about, and inspect the module instead?

That's a great idea, and changing that made me realize we were also missing the 
`PrintingPolicyProperty`.

> This code ignores enums that are present in Index.h but not in self.enums

As for this: good idea. This already fails because for some reason, our 
`AccessSpecifier` enum has a fourth kind `NONE` that was introduced right at 
the start (see 
https://github.com/llvm/llvm-project/commit/05f9613610aba1f041e79a2efbb4dc32ebaa3e70)
 and doesn't/shouldn't be used.

https://github.com/llvm/llvm-project/pull/143264
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