From ba748d9b045b74fc1b1aa0ebe7f79dcb4f1925b7 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Tue, 20 Jan 2026 23:00:08 +0900
Subject: [PATCH] Remove excessive check of message

The order of "unexpected" and "missing" keyword argument errors at
`Data#initialize` had not been defined strictly.

[Bug #21844](https://bugs.ruby-lang.org/issues/21844)
ruby/ruby#15910
---
 test/psych/test_data.rb | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/test/psych/test_data.rb b/test/psych/test_data.rb
index 57c34781..5e340c58 100644
--- a/test/psych/test_data.rb
+++ b/test/psych/test_data.rb
@@ -83,12 +83,11 @@ def test_members_must_be_identical
 
       # completely different members
       TestData.send :remove_const, :D
-      TestData.const_set :D, Data.define(:foo, :bar)
+      TestData.const_set :D, Data.define(:a, :c)
       e = assert_raise(ArgumentError) { Psych.unsafe_load d }
-      assert_equal 'unknown keywords: :a, :b', e.message
+      assert_include e.message, 'keyword:'
     ensure
       TestData.send :remove_const, :D
     end
   end
 end
-