Add simple tests for create_builtin()

Author: dr-carlos

Lib/test/test_import/__init__.py

@@ -1253,6 +1253,28 @@ class Spec2:
                 origin = "a\x00b"
             _imp.create_dynamic(Spec2())
 
+    def test_create_builtin(self):
+        class Spec:
+            name = None
+        spec = Spec()
+
+        with self.assertRaisesRegex(
+            TypeError,
+            'name must be string, not NoneType'
+        ):
+            _imp.create_builtin(spec)
+
+        class Spec:
+            name = ""
+        spec = Spec()
+
+        # gh-142029
+        with self.assertRaisesRegex(
+            TypeError,
+            'name must not be empty'
+        ):
+            _imp.create_builtin(spec)
+
     def test_filter_syntax_warnings_by_module(self):
         module_re = r'test\.test_import\.data\.syntax_warnings\z'
         unload('test.test_import.data.syntax_warnings')