[rubygems/rubygems] Fix weirdness of "interrupt" test command

https://github.com/rubygems/rubygems/commit/0a75590ac9

test/rubygems/rubygems/commands/interrupt_command.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+class Gem::Commands::InterruptCommand < Gem::Command
+  def initialize
+    super("interrupt", "Raises an Interrupt Exception", {})
+  end
+
+  def execute
+    raise Interrupt, "Interrupt exception"
+  end
+end

test/rubygems/rubygems_plugin.rb

@@ -2,23 +2,4 @@
 
 require "rubygems/command_manager"
 
-##
-# This is an example of exactly what NOT to do.
-#
-# DO NOT include code like this in your rubygems_plugin.rb
-
-module Gem::Commands
-  remove_const(:InterruptCommand) if defined?(InterruptCommand)
-end
-
-class Gem::Commands::InterruptCommand < Gem::Command
-  def initialize
-    super("interrupt", "Raises an Interrupt Exception", {})
-  end
-
-  def execute
-    raise Interrupt, "Interrupt exception"
-  end
-end
-
 Gem::CommandManager.instance.register_command :interrupt

test/rubygems/test_gem.rb

@@ -21,8 +21,6 @@ class TestGem < Gem::TestCase
     common_installer_setup
 
     @additional = %w[a b].map {|d| File.join @tempdir, d }
-
-    util_remove_interrupt_command
   end
 
   def test_self_finish_resolve
@@ -1524,8 +1522,6 @@ class TestGem < Gem::TestCase
       nil
     end
 
-    util_remove_interrupt_command
-
     # Should attempt to cause a StandardError
     with_plugin("standarderror") { Gem.load_env_plugins }
     begin
@@ -1534,8 +1530,6 @@ class TestGem < Gem::TestCase
       nil
     end
 
-    util_remove_interrupt_command
-
     # Should attempt to cause an Exception
     with_plugin("scripterror") { Gem.load_env_plugins }
     begin
@@ -1791,11 +1785,6 @@ class TestGem < Gem::TestCase
     spec
   end
 
-  def util_remove_interrupt_command
-    Gem::Commands.send :remove_const, :InterruptCommand if
-      Gem::Commands.const_defined? :InterruptCommand
-  end
-
   def util_cache_dir
     File.join Gem.dir, "cache"
   end

test/rubygems/test_gem_commands_help_command.rb

@@ -11,8 +11,6 @@ class TestGemCommandsHelpCommand < Gem::TestCase
     super
 
     @cmd = Gem::Commands::HelpCommand.new
-
-    load File.expand_path("rubygems_plugin.rb", __dir__) unless Gem::Commands.const_defined? :InterruptCommand
   end
 
   def test_gem_help_bad