From 42501015b4ffac67671cc5e1daedbacf5840d71b Mon Sep 17 00:00:00 2001
From: Matt Valentine-House <matt@eightbitraptor.com>
Date: Mon, 11 Nov 2024 12:04:12 +0000
Subject: rb_raise when attempting to set the GC implementation name

Instead of silently ignoring the key, we should raise to clearly tell
the user that this key is read-only.
---
 test/ruby/test_gc.rb | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

(limited to 'test/ruby')

diff --git a/test/ruby/test_gc.rb b/test/ruby/test_gc.rb
index 1eb5451b3f..72fab5c43c 100644
--- a/test/ruby/test_gc.rb
+++ b/test/ruby/test_gc.rb
@@ -127,9 +127,7 @@ class TestGc < Test::Unit::TestCase
   def test_gc_config_implementation_is_readonly
     omit unless /darwin|linux/.match(RUBY_PLATFORM)
 
-    impl = GC.config[:implementation]
-    GC.config(implementation: "somethingelse")
-    assert_equal(impl, GC.config[:implementation])
+    assert_raise(ArgumentError) { GC.config(implementation: "somethingelse") }
   end
 
   def test_start_full_mark
-- 
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