Removed minitest/autorun

tool/lib/minitest/autorun.rb

@@ -1,14 +0,0 @@
-# encoding: utf-8
-# frozen_string_literal: true
-
-begin
-  require 'rubygems'
-  gem 'minitest'
-rescue Gem::LoadError
-  # do nothing
-end
-
-require 'minitest/unit'
-require 'minitest/mock'
-
-MiniTest::Unit.autorun

tool/test/minitest/metametameta.rb

@@ -3,7 +3,6 @@
 
 require 'tempfile'
 require 'stringio'
-require 'minitest/autorun'
 
 class MiniTest::Unit::TestCase
   def clean s

tool/test/minitest/test_minitest_benchmark.rb

@@ -1,7 +1,6 @@
 # encoding: utf-8
 # frozen_string_literal: false
 
-require 'minitest/autorun'
 require 'minitest/benchmark'
 
 ##

tool/test/minitest/test_minitest_mock.rb

@@ -1,7 +1,7 @@
 # encoding: utf-8
 # frozen_string_literal: false
 
-require 'minitest/autorun'
+require 'minitest/mock'
 
 class TestMiniTestMock < MiniTest::Unit::TestCase
   def setup