https://git.ruby-lang.org/ruby.git/commit/?id=e8274a7683

From e8274a7683645082e96ced6a00d2df9ba10942ed Mon Sep 17 00:00:00 2001
From: Ellen Marie Dash <me@d...>
Date: Thu, 30 Jul 2020 17:24:05 -0400
Subject: [rubygems/rubygems] Add test for "gem update --system --silent"

https://github.com/rubygems/rubygems/commit/c3fb0db930

diff --git a/lib/rubygems/commands/update_command.rb b/lib/rubygems/commands/update_command.rb
index 2df6a48..b7609ed 100644
--- a/lib/rubygems/commands/update_command.rb
+++ b/lib/rubygems/commands/update_command.rb
@@ -174,13 +174,13 @@ command to remove old versions. https://github.com/ruby/ruby/blob/trunk/lib/rubygems/commands/update_command.rb#L174
     update_dir = File.join Gem.dir, 'gems', "rubygems-update-#{version}"
 
     Dir.chdir update_dir do
-      say "Installing RubyGems #{version}"
+      say "Installing RubyGems #{version}" unless options[:silent]
 
       installed = preparing_gem_layout_for(version) do
         system Gem.ruby, '--disable-gems', 'setup.rb', *args
       end
 
-      say "RubyGems system software updated" if installed
+      say "RubyGems system software updated" if installed unless options[:silent]
     end
   end
 
diff --git a/test/rubygems/test_gem_commands_update_command.rb b/test/rubygems/test_gem_commands_update_command.rb
index eed799c..cacde06 100644
--- a/test/rubygems/test_gem_commands_update_command.rb
+++ b/test/rubygems/test_gem_commands_update_command.rb
@@ -276,6 +276,34 @@ class TestGemCommandsUpdateCommand < Gem::TestCase https://github.com/ruby/ruby/blob/trunk/test/rubygems/test_gem_commands_update_command.rb#L276
     Gem.disable_system_update_message = old_disable_system_update_message
   end
 
+  # The other style of `gem update --system` tests don't actually run
+  # setup.rb, so we just check that setup.rb gets the `--silent` flag.
+  def test_execute_system_silent_passed_to_setuprb
+    @cmd.options[:args] = []
+    @cmd.options[:system] = true
+    @cmd.options[:silent] = true
+
+    assert_equal true, @cmd.update_rubygems_arguments.include?('--silent')
+  end
+
+  def test_execute_system_silent
+    spec_fetcher do |fetcher|
+      fetcher.download 'rubygems-update', 9 do |s|
+        s.files = %w[setup.rb]
+      end
+    end
+
+    @cmd.options[:args]          = []
+    @cmd.options[:system]        = true
+    @cmd.options[:silent]        = true
+
+    use_ui @ui do
+      @cmd.execute
+    end
+
+    assert_empty @ui.output
+  end
+
   # before:
   #   a1 -> c1.2
   # after:
-- 
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