Port test_warn_bundled_gems.rb to RSpec example

lib/bundled_gems.rb

@@ -52,7 +52,11 @@ module Gem::BUNDLED_GEMS
   WARNED = {}                   # unfrozen
 
   conf = ::RbConfig::CONFIG
-  LIBDIR = (conf["rubylibdir"] + "/").freeze
+  if !File.exist?(conf["rubylibdir"])
+    LIBDIR = (File.expand_path(File.join(__dir__, "..", "lib")) + "/").freeze
+  else
+    LIBDIR = (conf["rubylibdir"] + "/").freeze
+  end
   ARCHDIR = (conf["rubyarchdir"] + "/").freeze
   dlext = [conf["DLEXT"], "so"].uniq
   DLEXT = /\.#{Regexp.union(dlext)}\z/

spec/bundler/bundled_gems_spec.rb

@@ -0,0 +1,25 @@
+require "bundled_gems"
+
+RSpec.describe "bundled_gems.rb" do
+  def script(code, options = {})
+    options[:artifice] ||= "compact_index"
+    ruby("require 'bundler/inline'\n\n" + code, options)
+  end
+
+  it "Show warning require and LoadError" do
+    script <<-RUBY
+      gemfile do
+        source "https://rubygems.org"
+      end
+
+      begin
+        require "csv"
+      rescue LoadError
+      end
+      require "ostruct"
+    RUBY
+
+    expect(err).to include(/csv was loaded from (.*) from Ruby 3.4.0/)
+    expect(err).to include(/ostruct was loaded from (.*) from Ruby 3.5.0/)
+  end
+end

tool/test_for_warn_bundled_gems/test.sh

@@ -1,9 +1,5 @@
 #!/bin/bash
 
-echo "* Show warning require and LoadError"
-ruby test_warn_bundled_gems.rb
-echo
-
 echo "* Show warning when bundled gems called as dependency"
 ruby test_warn_dependency.rb
 echo

tool/test_for_warn_bundled_gems/test_warn_bundled_gems.rb

@@ -1,13 +0,0 @@
-require "bundler"
-Bundler::Definition.no_lock = true
-
-require "bundler/inline"
-
-gemfile do
-  source "https://rubygems.org"
-end
-
-Object.send(:remove_const, :Bundler)
-
-require "mutex_m"
-require "rss"