From c959741695d9cccd5376775596dce643b5a500a1 Mon Sep 17 00:00:00 2001
From: Jason Lunn <jason.lunn@gmail.com>
Date: Thu, 15 Jan 2026 17:07:18 -0500
Subject: [ruby/rubygems] Add test

https://github.com/ruby/rubygems/commit/3d8140b289
---
 test/rubygems/test_gem_ext_builder.rb | 52 ++++++++++++++++++++++++++++++++++-
 1 file changed, 51 insertions(+), 1 deletion(-)

diff --git a/test/rubygems/test_gem_ext_builder.rb b/test/rubygems/test_gem_ext_builder.rb
index 34f85e6b75..4ac386c4b4 100644
--- a/test/rubygems/test_gem_ext_builder.rb
+++ b/test/rubygems/test_gem_ext_builder.rb
@@ -18,7 +18,7 @@ class TestGemExtBuilder < Gem::TestCase
 
     @spec = util_spec "a"
 
-    @builder = Gem::Ext::Builder.new @spec, ""
+    @builder = Gem::Ext::Builder.new @spec
   end
 
   def teardown
@@ -201,6 +201,56 @@ install:
     Gem.configuration.install_extension_in_lib = @orig_install_extension_in_lib
   end
 
+def test_build_multiple_extensions
+    pend "terminates on mswin" if vc_windows? && ruby_repo?
+
+    extension_in_lib do
+      @spec.extensions << "ext/Rakefile"
+      @spec.extensions << "ext/extconf.rb"
+
+      ext_dir = File.join @spec.gem_dir, "ext"
+
+      FileUtils.mkdir_p ext_dir
+
+      extconf_rb = File.join ext_dir, "extconf.rb"
+      rakefile = File.join ext_dir, "Rakefile"
+
+      File.open extconf_rb, "w" do |f|
+        f.write <<-'RUBY'
+          require 'mkmf'
+
+          create_makefile 'a'
+        RUBY
+      end
+
+      File.open rakefile, "w" do |f|
+        f.write <<-RUBY
+          task :default do
+            FileUtils.touch File.join "#{ext_dir}", 'foo'
+          end
+        RUBY
+      end
+
+      ext_lib_dir = File.join ext_dir, "lib"
+      FileUtils.mkdir ext_lib_dir
+      FileUtils.touch File.join ext_lib_dir, "a.rb"
+      FileUtils.mkdir File.join ext_lib_dir, "a"
+      FileUtils.touch File.join ext_lib_dir, "a", "b.rb"
+
+      use_ui @ui do
+        @builder.build_extensions
+      end
+
+      assert_path_exist @spec.extension_dir
+      assert_path_exist @spec.gem_build_complete_path
+      assert_path_exist File.join @spec.gem_dir, "ext", "foo"
+      assert_path_exist File.join @spec.extension_dir, "gem_make.out"
+      assert_path_exist File.join @spec.extension_dir, "a.rb"
+      assert_path_exist File.join @spec.gem_dir, "lib", "a.rb"
+      assert_path_exist File.join @spec.gem_dir, "lib", "a", "b.rb"
+    end
+  end
+  
   def test_build_extensions_none
     use_ui @ui do
       @builder.build_extensions
-- 
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