From fa10441981c89deec914ba243360b40c5aede6ed Mon Sep 17 00:00:00 2001
From: Matt Valentine-House <matt@eightbitraptor.com>
Date: Tue, 8 Oct 2024 12:16:14 +0100
Subject: Expose GC.config[:implementation], to query the currently active GC

And a default and readonly key to the GC.config hash that names the
current GC implementation.

This is provided by each implementation by the API function
rb_gc_impl_active_gc_name
---
 test/ruby/test_gc.rb | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'test/ruby')

diff --git a/test/ruby/test_gc.rb b/test/ruby/test_gc.rb
index f0ab0b0c1a..1eb5451b3f 100644
--- a/test/ruby/test_gc.rb
+++ b/test/ruby/test_gc.rb
@@ -117,6 +117,21 @@ class TestGc < Test::Unit::TestCase
     GC.start
   end
 
+  def test_gc_config_implementation
+    omit unless /darwin|linux/.match(RUBY_PLATFORM)
+
+    gc_name = (ENV['RUBY_GC_LIBRARY'] || "default")
+    assert_equal gc_name, GC.config[:implementation]
+  end
+
+  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])
+  end
+
   def test_start_full_mark
     return unless use_rgengc?
     omit 'stress' if GC.stress
-- 
cgit v1.2.3