https://git.ruby-lang.org/ruby.git/commit/?id=46462200af

From 46462200afef55fd21b72ad1ff745739b085a793 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?V=C3=ADt=20Ondruch?= <vondruch@r...>
Date: Tue, 27 Aug 2019 13:16:27 +0200
Subject: [rubygems/rubygems] Test that two calls to `stub_for` returns the
 same (cached) instance.

https://github.com/rubygems/rubygems/commit/00b3f55562

diff --git a/test/rubygems/test_gem_specification.rb b/test/rubygems/test_gem_specification.rb
index f6caba8..afcdc0d 100644
--- a/test/rubygems/test_gem_specification.rb
+++ b/test/rubygems/test_gem_specification.rb
@@ -1193,6 +1193,11 @@ dependencies: [] https://github.com/ruby/ruby/blob/trunk/test/rubygems/test_gem_specification.rb#L1193
     assert_equal ['b-1'], Gem::Specification.stubs_for('b').map { |s| s.full_name }
     assert_equal 2, Gem::Specification.class_variable_get(:@@stubs_by_name).length
 
+    assert_equal(
+      Gem::Specification.stubs_for('a').map { |s| s.object_id },
+      Gem::Specification.stubs_for('a').map { |s| s.object_id }
+    )
+
     Gem.loaded_specs.delete 'a'
     Gem.loaded_specs.delete 'b'
     Gem::Specification.class_variable_set(:@@stubs, nil)
-- 
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