test_builtin.py: test_type_qualname fix

Lib/test/test_builtin.py

@@ -2441,8 +2441,6 @@ class TestType(unittest.TestCase):
             A.__name__ = b'A'
         self.assertEqual(A.__name__, 'C')
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_type_qualname(self):
         A = type('A', (), {'__qualname__': 'B.C'})
         self.assertEqual(A.__name__, 'A')

vm/src/builtins/type.rs

@@ -206,6 +206,15 @@ impl PyType {
             slots.flags |= PyTypeFlags::HAS_DICT
         }
 
+        if let Some(qualname) = attrs.get(identifier!(ctx, __qualname__)) {
+            if !qualname.fast_isinstance(ctx.types.str_type) {
+                return Err(format!(
+                    "type __qualname__ must be a str, not {}",
+                    qualname.class().name()
+                ));
+            }
+        }
+
         let new_type = PyRef::new_ref(
             PyType {
                 base: Some(base),