https://git.ruby-lang.org/ruby.git/commit/?id=6e80cabb90

From 6e80cabb90cec19db24cf4e19fcd4e65cdf41e70 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 8 Mar 2020 17:38:37 +0900
Subject: [rubygems/rubygems] Specify explicit separator not to be affected by
 $;

https://github.com/rubygems/rubygems/commit/1cea3d4dce

diff --git a/lib/rubygems/command.rb b/lib/rubygems/command.rb
index 9b7b41d..2fb3dab 100644
--- a/lib/rubygems/command.rb
+++ b/lib/rubygems/command.rb
@@ -77,7 +77,7 @@ class Gem::Command https://github.com/ruby/ruby/blob/trunk/lib/rubygems/command.rb#L77
     when Array
       @extra_args = value
     when String
-      @extra_args = value.split
+      @extra_args = value.split(' ')
     end
   end
 
diff --git a/test/rubygems/test_gem_command.rb b/test/rubygems/test_gem_command.rb
index c3f057f..44ec324 100644
--- a/test/rubygems/test_gem_command.rb
+++ b/test/rubygems/test_gem_command.rb
@@ -57,6 +57,27 @@ class TestGemCommand < Gem::TestCase https://github.com/ruby/ruby/blob/trunk/test/rubygems/test_gem_command.rb#L57
     assert_equal [], h
   end
 
+  def test_self_extra_args
+    verbose, $VERBOSE, separator = $VERBOSE, nil, $;
+    extra_args = Gem::Command.extra_args
+
+    Gem::Command.extra_args = %w[--all]
+    assert_equal %w[--all], Gem::Command.extra_args
+
+    Gem::Command.extra_args = "--file --help"
+    assert_equal %w[--file --help], Gem::Command.extra_args
+
+    $; = "="
+
+    Gem::Command.extra_args = "--awesome=true --verbose"
+    assert_equal %w[--awesome=true --verbose], Gem::Command.extra_args
+
+  ensure
+    Gem::Command.extra_args = extra_args
+    $; = separator
+    $VERBOSE = verbose
+  end
+
   def test_basic_accessors
     assert_equal "doit", @cmd.command
     assert_equal "gem doit", @cmd.program_name
-- 
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