https://git.ruby-lang.org/ruby.git/commit/?id=ae3d0d8a20

From ae3d0d8a20c74e8163957deddc30ac81e40be353 Mon Sep 17 00:00:00 2001
From: Benoit Daloze <eregontp@g...>
Date: Sat, 9 May 2020 12:40:57 +0200
Subject: [rubygems/rubygems] Add a more comprehensive and reliable test for
 upgraded default gems

* Test that the correct version is loaded and that the default gem is
  not loaded at all.

https://github.com/rubygems/rubygems/commit/ee08508b2a

diff --git a/test/rubygems/test_require.rb b/test/rubygems/test_require.rb
index 9e66be5..7a46093 100644
--- a/test/rubygems/test_require.rb
+++ b/test/rubygems/test_require.rb
@@ -452,9 +452,31 @@ class TestGemRequire < Gem::TestCase https://github.com/ruby/ruby/blob/trunk/test/rubygems/test_require.rb#L452
       puts Gem.loaded_specs["json"]
     RUBY
     output = Gem::Util.popen(*ruby_with_rubygems_in_load_path, "-e", cmd).strip
+    assert $?.success?
     refute_empty output
   end
 
+  def test_realworld_upgraded_default_gem
+    testing_ruby_repo = !ENV["GEM_COMMAND"].nil?
+    skip "this test can't work under ruby-core setup" if testing_ruby_repo
+
+    newer_json = util_spec("json", "999.99.9", nil, ["lib/json.rb"])
+    install_gem newer_json
+
+    cmd = <<-RUBY
+      $stderr = $stdout
+      require "json"
+      puts Gem.loaded_specs["json"].version
+      puts $LOADED_FEATURES
+    RUBY
+    output = Gem::Util.popen({ 'GEM_HOME' => @gemhome }, *ruby_with_rubygems_in_load_path, "-e", cmd).strip
+    assert $?.success?
+    refute_empty output
+    assert_equal "999.99.9", output.lines[0].chomp
+    # Make sure only files from the newer json gem are loaded, and no files from the default json gem
+    assert_equal ["#{@gemhome}/gems/json-999.99.9/lib/json.rb"], output.lines.grep(%r{/gems/json-}).map(&:chomp)
+  end
+
   def test_default_gem_and_normal_gem
     default_gem_spec = new_default_spec("default", "2.0.0.0",
                                         nil, "default/gem.rb")
-- 
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