https://git.ruby-lang.org/ruby.git/commit/?id=67e062b523

From 67e062b523e1a1bdf597a500027c916c16cd07a1 Mon Sep 17 00:00:00 2001
From: Marc-Andre Lafortune <github@m...>
Date: Sat, 19 Dec 2020 12:17:47 -0500
Subject: [ruby/matrix] Add Ractor test

This reverts commit cacdf2681dcc7c431973f33a18979b10566ec2f9.

diff --git a/test/matrix/test_matrix.rb b/test/matrix/test_matrix.rb
index 873e118..04e8a5b 100644
--- a/test/matrix/test_matrix.rb
+++ b/test/matrix/test_matrix.rb
@@ -819,14 +819,14 @@ class TestMatrix < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/matrix/test_matrix.rb#L819
     assert_equal(Matrix.empty(0,2), @e1.adjoint)
   end
 
-=begin
   def test_ractor
-    obj1 = @m1.freeze
-
-    obj2 = Ractor.new obj1 do |obj|
-      obj
-    end.take
-    assert_same obj1, obj2
-  end if defined?(Ractor)
-=end
+    assert_ractor(<<~RUBY, require: 'matrix')
+      obj1 = Matrix[[1, 2], [3, 4]].freeze
+
+      obj2 = Ractor.new obj1 do |obj|
+        obj
+      end.take
+      assert_same obj1, obj2
+    RUBY
+  end
 end
-- 
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