Port bundle exec with shebang script to RSpec example

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

spec/bundler/bundled_gems_spec.rb

@@ -74,6 +74,20 @@ RSpec.describe "bundled_gems.rb" do
     expect(err).to include(/ostruct was loaded from (.*) from Ruby 3.5.0/)
   end
 
+  it "Show warning when bundle exec with shebang's script" do
+    code = <<-RUBY
+      #!/usr/bin/env ruby
+      require "ostruct"
+    RUBY
+    create_file("script.rb", code)
+    FileUtils.chmod(0o777, bundled_app("script.rb"))
+    create_file("Gemfile", "source 'https://rubygems.org'")
+
+    bundle "exec ./script.rb"
+
+    expect(err).to include(/ostruct was loaded from (.*) from Ruby 3.5.0/)
+  end
+
   it "Show warning when warn is not the standard one in the current scope" do
     script <<-RUBY
       module My

tool/test_for_warn_bundled_gems/test.sh

@@ -4,10 +4,6 @@ echo "* Show warning sub-feature like bigdecimal/util"
 ruby test_warn_sub_feature.rb
 echo
 
-echo "* Show warning when bundle exec with shebang's script"
-bundle exec ./test_warn_bundle_exec_shebang.rb
-echo
-
 echo "* Show warning when bundle exec with -r option"
 bundle exec ruby -rostruct -e ''
 echo

tool/test_for_warn_bundled_gems/test_warn_bundle_exec_shebang.rb

@@ -1,3 +0,0 @@
-#!/usr/bin/env ruby
-
-require "base64"