https://git.ruby-lang.org/ruby.git/commit/?id=f2d6fa16e1

From f2d6fa16e116cbb624ccc8df4cbc57422e236d46 Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@r...>
Date: Thu, 6 May 2021 17:19:41 +0900
Subject: Use assert_ractor for separating test processes

---
 test/test_prime.rb | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/test/test_prime.rb b/test/test_prime.rb
index 8e8203e..a0e8af5 100644
--- a/test/test_prime.rb
+++ b/test/test_prime.rb
@@ -262,13 +262,12 @@ class TestPrime < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/test_prime.rb#L262
       assert_equal 861, (100_000..110_000).count(&:prime?)
     end
 
-=begin
-  # now Ractor should not use in test-all process
     def test_prime_in_ractor
-      # Test usage of private constant...
-      assert_equal false, Ractor.new { ((2**13-1) * (2**17-1)).prime? }.take
+      assert_ractor(<<~RUBY, require: 'prime')
+        # Test usage of private constant...
+        assert_equal false, Ractor.new { ((2**13-1) * (2**17-1)).prime? }.take
+      RUBY
     end if defined?(Ractor)
-=end
   end
 
   def test_eratosthenes_works_fine_after_timeout
-- 
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