From 7d32830b8ce14cc130d052a4aa67495a34ed55dc Mon Sep 17 00:00:00 2001
From: Ellen Marie Dash <me@duckie.co>
Date: Thu, 30 Nov 2023 20:20:38 -0500
Subject: [rubygems/rubygems] Make --build-root disable auto-user-install.

https://github.com/rubygems/rubygems/commit/6a06b0763f
---
 test/rubygems/test_gem_installer.rb | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'test')

diff --git a/test/rubygems/test_gem_installer.rb b/test/rubygems/test_gem_installer.rb
index 03903ff9d3..d0f213fb8d 100644
--- a/test/rubygems/test_gem_installer.rb
+++ b/test/rubygems/test_gem_installer.rb
@@ -1285,6 +1285,26 @@ end
     assert_equal @spec, installer.install
   end
 
+  def test_install_build_root_when_gem_home_not_writable_does_not_fallback_to_user_install_inside_build_root
+    build_root = File.join(@tempdir, "build_root")
+
+    orig_gem_home = ENV.delete("GEM_HOME")
+
+    @gem = setup_base_gem
+
+    FileUtils.chmod "-w", @gemhome
+
+    installer = Gem::Installer.at @gem, :build_root => build_root
+
+    assert_equal @spec, installer.install
+
+    build_root_path = File.join(build_root, @gemhome.gsub(/^[a-zA-Z]:/, ""))
+    assert File.exist?(build_root_path), "gem not written to build_root"
+  ensure
+    FileUtils.chmod "+w", @gemhome
+    ENV["GEM_HOME"] = orig_gem_home
+  end
+
   def test_install_missing_dirs
     installer = setup_base_installer
 
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