Added test script for bundled_gems.rb with zeitwerk

tool/test_for_warn_bundled_gems/test.sh

@@ -24,6 +24,9 @@ ruby test_no_warn_dependency.rb
 echo "* Don't show warning with bootsnap"
 ruby test_no_warn_bootsnap.rb
 
+echo "* Don't show warning with zeitwerk"
+ruby test_no_warn_zeitwerk.rb
+
 echo "* Don't show warning with net/smtp when net-smtp on Gemfile"
 ruby test_no_warn_dash_gem.rb
 

tool/test_for_warn_bundled_gems/test_no_warn_zeitwerk.rb

@@ -0,0 +1,12 @@
+require "bundler/inline"
+
+gemfile do
+  source "https://rubygems.org"
+  gem "zeitwerk", require: false
+end
+
+require "zeitwerk"
+loader = Zeitwerk::Loader.for_gem(warn_on_extra_files: false)
+loader.setup
+
+require 'csv'