Check message in tests

Author: remilapeyre

Lib/test/test_ast.py

@@ -378,8 +378,10 @@ def test_classattrs(self):
 
         self.assertRaises(TypeError, ast.Num, 1, None, 2)
         self.assertRaises(TypeError, ast.Num, 1, None, 2, lineno=0)
-        self.assertRaises(TypeError, ast.Num, 1, n=2)
-        self.assertRaises(TypeError, ast.Constant, 1, value=2)
+        with self.assertRaisesRegex(TypeError, "Num got multiple values for argument 'n'"):
+            ast.Num(1, n=2)
+        with self.assertRaisesRegex(TypeError, "Constant got multiple values for argument 'value'"):
+            ast.Constant(1, value=2)
 
         self.assertEqual(ast.Num(42).n, 42)
         self.assertEqual(ast.Num(4.25).n, 4.25)