Port test_warn_sub_feature.rb to RSpec example

Merged: https://github.com/ruby/ruby/pull/12096

lib/bundled_gems.rb

@@ -55,10 +55,11 @@ module Gem::BUNDLED_GEMS
   conf = ::RbConfig::CONFIG
   if ENV["TEST_BUNDLED_GEMS"]
     LIBDIR = (File.expand_path(File.join(__dir__, "..", "lib")) + "/").freeze
+    ARCHDIR = (File.expand_path(File.join(__dir__, "..", ".ext/common")) + "/").freeze
   else
     LIBDIR = (conf["rubylibdir"] + "/").freeze
+    ARCHDIR = (conf["rubyarchdir"] + "/").freeze
   end
-  ARCHDIR = (conf["rubyarchdir"] + "/").freeze
   dlext = [conf["DLEXT"], "so"].uniq
   DLEXT = /\.#{Regexp.union(dlext)}\z/
   LIBEXT = /\.#{Regexp.union("rb", *dlext)}\z/
@@ -122,7 +123,7 @@ module Gem::BUNDLED_GEMS
     if !path
       return
     elsif path.start_with?(ARCHDIR)
-      n = path.delete_prefix(ARCHDIR).sub(DLEXT, "")
+      n = path.delete_prefix(ARCHDIR).sub(DLEXT, "").chomp(".rb")
     elsif path.start_with?(LIBDIR)
       n = path.delete_prefix(LIBDIR).chomp(".rb")
     else

spec/bundler/bundled_gems_spec.rb

@@ -62,6 +62,18 @@ RSpec.describe "bundled_gems.rb" do
     expect(err).to include("You can add net-smtp")
   end
 
+  it "Show warning sub-feature like fiddle/import" do
+    script <<-RUBY
+      gemfile do
+        source "https://rubygems.org"
+      end
+
+      require "fiddle/import"
+    RUBY
+
+    expect(err).to include(/fiddle was loaded from (.*) from Ruby 3.5.0/)
+  end
+
   it "Show warning when bundle exec with ruby and script" do
     code = <<-RUBY
       require "ostruct"

tool/test_for_warn_bundled_gems/test.sh

@@ -1,9 +1,5 @@
 #!/bin/bash
 
-echo "* Show warning sub-feature like bigdecimal/util"
-ruby test_warn_sub_feature.rb
-echo
-
 echo "* Show warning with bootsnap"
 ruby test_warn_bootsnap.rb
 echo

tool/test_for_warn_bundled_gems/test_warn_sub_feature.rb

@@ -1,10 +0,0 @@
-require "bundler"
-Bundler::Definition.no_lock = true
-
-require "bundler/inline"
-
-gemfile do
-  source "https://rubygems.org"
-end
-
-require "bigdecimal/util"