1 files changed, 1576 insertions, 0 deletions
diff --git a/jni/ruby/test/rubygems/test_gem.rb b/jni/ruby/test/rubygems/test_gem.rb
new file mode 100644
index 0000000..47f57ab
--- /dev/null
+++ b/jni/ruby/test/rubygems/test_gem.rb
@@ -0,0 +1,1576 @@
+# coding: US-ASCII
+require 'rubygems/test_case'
+require 'rubygems'
+require 'rubygems/command'
+require 'rubygems/installer'
+require 'pathname'
+require 'tmpdir'
+
+# TODO: push this up to test_case.rb once battle tested
+$SAFE=1
+$LOAD_PATH.map! do |path|
+  path.dup.untaint
+end
+
+class TestGem < Gem::TestCase
+
+  PLUGINS_LOADED = []
+
+  def setup
+    super
+
+    PLUGINS_LOADED.clear
+
+    common_installer_setup
+
+    ENV.delete 'RUBYGEMS_GEMDEPS'
+    @additional = %w[a b].map { |d| File.join @tempdir, d }
+
+    util_remove_interrupt_command
+  end
+
+  def test_self_finish_resolve
+    save_loaded_features do
+      a1 = new_spec "a", "1", "b" => "> 0"
+      b1 = new_spec "b", "1", "c" => ">= 1"
+      b2 = new_spec "b", "2", "c" => ">= 2"
+      c1 = new_spec "c", "1"
+      c2 = new_spec "c", "2"
+
+      install_specs a1, b1, b2, c1, c2
+
+      a1.activate
+
+      assert_equal %w(a-1), loaded_spec_names
+      assert_equal ["b (> 0)"], unresolved_names
+
+      Gem.finish_resolve
+
+      assert_equal %w(a-1 b-2 c-2), loaded_spec_names
+      assert_equal [], unresolved_names
+    end
+  end
+
+  def test_self_finish_resolve_wtf
+    save_loaded_features do
+      a1 = new_spec "a", "1", "b" => "> 0", "d" => "> 0"    # this
+      b1 = new_spec "b", "1", { "c" => ">= 1" }, "lib/b.rb" # this
+      b2 = new_spec "b", "2", { "c" => ">= 2" }, "lib/b.rb"
+      c1 = new_spec "c", "1"                                # this
+      c2 = new_spec "c", "2"
+      d1 = new_spec "d", "1", { "c" => "< 2" },  "lib/d.rb"
+      d2 = new_spec "d", "2", { "c" => "< 2" },  "lib/d.rb" # this
+
+      install_specs a1, b1, b2, c1, c2, d1, d2
+
+      a1.activate
+
+      assert_equal %w(a-1), loaded_spec_names
+      assert_equal ["b (> 0)", "d (> 0)"], unresolved_names
+
+      Gem.finish_resolve
+
+      assert_equal %w(a-1 b-1 c-1 d-2), loaded_spec_names
+      assert_equal [], unresolved_names
+    end
+  end
+
+  def test_self_install
+    spec_fetcher do |f|
+      f.gem  'a', 1
+      f.spec 'a', 2
+    end
+
+    gemhome2 = "#{@gemhome}2"
+
+    installed = Gem.install 'a', '= 1', :install_dir => gemhome2
+
+    assert_equal %w[a-1], installed.map { |spec| spec.full_name }
+
+    assert_path_exists File.join(gemhome2, 'gems', 'a-1')
+  end
+
+  def test_require_missing
+    save_loaded_features do
+      assert_raises ::LoadError do
+        require "q"
+      end
+    end
+  end
+
+  def test_require_does_not_glob
+    save_loaded_features do
+      a1 = new_spec "a", "1", nil, "lib/a1.rb"
+
+      install_specs a1
+
+      assert_raises ::LoadError do
+        require "a*"
+      end
+
+      assert_equal [], loaded_spec_names
+    end
+  end
+
+  def test_self_bin_path_active
+    a1 = util_spec 'a', '1' do |s|
+      s.executables = ['exec']
+    end
+
+    util_spec 'a', '2' do |s|
+      s.executables = ['exec']
+    end
+
+    a1.activate
+
+    assert_match 'a-1/bin/exec', Gem.bin_path('a', 'exec', '>= 0')
+  end
+
+  def test_self_bin_path_no_exec_name
+    e = assert_raises ArgumentError do
+      Gem.bin_path 'a'
+    end
+
+    assert_equal 'you must supply exec_name', e.message
+  end
+
+  def test_self_bin_path_bin_name
+    util_exec_gem
+    assert_equal @abin_path, Gem.bin_path('a', 'abin')
+  end
+
+  def test_self_bin_path_bin_name_version
+    util_exec_gem
+    assert_equal @abin_path, Gem.bin_path('a', 'abin', '4')
+  end
+
+  def test_self_bin_path_nonexistent_binfile
+    util_spec 'a', '2' do |s|
+      s.executables = ['exec']
+    end
+    assert_raises(Gem::GemNotFoundException) do
+      Gem.bin_path('a', 'other', '2')
+    end
+  end
+
+  def test_self_bin_path_no_bin_file
+    util_spec 'a', '1'
+    assert_raises(ArgumentError) do
+      Gem.bin_path('a', nil, '1')
+    end
+  end
+
+  def test_self_bin_path_not_found
+    assert_raises(Gem::GemNotFoundException) do
+      Gem.bin_path('non-existent', 'blah')
+    end
+  end
+
+  def test_self_bin_path_bin_file_gone_in_latest
+    util_exec_gem
+    util_spec 'a', '10' do |s|
+      s.executables = []
+    end
+    # Should not find a-10's non-abin (bug)
+    assert_equal @abin_path, Gem.bin_path('a', 'abin')
+  end
+
+  def test_self_bindir
+    assert_equal File.join(@gemhome, 'bin'), Gem.bindir
+    assert_equal File.join(@gemhome, 'bin'), Gem.bindir(Gem.dir)
+    assert_equal File.join(@gemhome, 'bin'), Gem.bindir(Pathname.new(Gem.dir))
+  end
+
+  def test_self_bindir_default_dir
+    default = Gem.default_dir
+
+    assert_equal Gem.default_bindir, Gem.bindir(default)
+  end
+
+  def test_self_clear_paths
+    assert_match(/gemhome$/, Gem.dir)
+    assert_match(/gemhome$/, Gem.path.first)
+
+    Gem.clear_paths
+
+    assert_nil Gem::Specification.send(:class_variable_get, :@@all)
+  end
+
+  def test_self_configuration
+    expected = Gem::ConfigFile.new []
+    Gem.configuration = nil
+
+    assert_equal expected, Gem.configuration
+  end
+
+  def test_self_datadir
+    foo = nil
+
+    Dir.chdir @tempdir do
+      FileUtils.mkdir_p 'data'
+      File.open File.join('data', 'foo.txt'), 'w' do |fp|
+        fp.puts 'blah'
+      end
+
+      foo = util_spec 'foo' do |s| s.files = %w[data/foo.txt] end
+      install_gem foo
+    end
+
+    gem 'foo'
+
+    expected = File.join @gemhome, 'gems', foo.full_name, 'data', 'foo'
+
+    assert_equal expected, Gem.datadir('foo')
+  end
+
+  def test_self_datadir_nonexistent_package
+    assert_nil Gem.datadir('xyzzy')
+  end
+
+  def test_self_default_exec_format
+    ruby_install_name 'ruby' do
+      assert_equal '%s', Gem.default_exec_format
+    end
+  end
+
+  def test_self_default_exec_format_18
+    ruby_install_name 'ruby18' do
+      assert_equal '%s18', Gem.default_exec_format
+    end
+  end
+
+  def test_self_default_exec_format_jruby
+    ruby_install_name 'jruby' do
+      assert_equal 'j%s', Gem.default_exec_format
+    end
+  end
+
+  def test_default_path
+    orig_vendordir = RbConfig::CONFIG['vendordir']
+    RbConfig::CONFIG['vendordir'] = File.join @tempdir, 'vendor'
+
+    FileUtils.rm_rf Gem.user_home
+
+    expected = [Gem.default_dir]
+
+    assert_equal expected, Gem.default_path
+  ensure
+    RbConfig::CONFIG['vendordir'] = orig_vendordir
+  end
+
+  def test_default_path_missing_vendor
+    orig_vendordir = RbConfig::CONFIG['vendordir']
+    RbConfig::CONFIG.delete 'vendordir'
+
+    FileUtils.rm_rf Gem.user_home
+
+    expected = [Gem.default_dir]
+
+    assert_equal expected, Gem.default_path
+  ensure
+    RbConfig::CONFIG['vendordir'] = orig_vendordir
+  end
+
+  def test_default_path_user_home
+    orig_vendordir = RbConfig::CONFIG['vendordir']
+    RbConfig::CONFIG['vendordir'] = File.join @tempdir, 'vendor'
+
+    expected = [Gem.user_dir, Gem.default_dir]
+
+    assert_equal expected, Gem.default_path
+  ensure
+    RbConfig::CONFIG['vendordir'] = orig_vendordir
+  end
+
+  def test_default_path_vendor_dir
+    orig_vendordir = RbConfig::CONFIG['vendordir']
+    RbConfig::CONFIG['vendordir'] = File.join @tempdir, 'vendor'
+
+    FileUtils.mkdir_p Gem.vendor_dir
+
+    FileUtils.rm_rf Gem.user_home
+
+    expected = [Gem.default_dir, Gem.vendor_dir]
+
+    assert_equal expected, Gem.default_path
+  ensure
+    RbConfig::CONFIG['vendordir'] = orig_vendordir
+  end
+
+  def test_self_default_sources
+    assert_equal %w[https://rubygems.org/], Gem.default_sources
+  end
+
+  def test_self_detect_gemdeps
+    skip 'Insecure operation - chdir' if RUBY_VERSION <= "1.8.7"
+    rubygems_gemdeps, ENV['RUBYGEMS_GEMDEPS'] = ENV['RUBYGEMS_GEMDEPS'], '-'
+
+    FileUtils.mkdir_p 'detect/a/b'
+    FileUtils.mkdir_p 'detect/a/Isolate'
+
+    FileUtils.touch 'detect/Isolate'
+
+    begin
+      Dir.chdir 'detect/a/b'
+
+      assert_empty Gem.detect_gemdeps
+    ensure
+      Dir.chdir @tempdir
+    end
+  ensure
+    ENV['RUBYGEMS_GEMDEPS'] = rubygems_gemdeps
+  end
+
+  def test_self_dir
+    assert_equal @gemhome, Gem.dir
+  end
+
+  def test_self_ensure_gem_directories
+    FileUtils.rm_r @gemhome
+    Gem.use_paths @gemhome
+
+    Gem.ensure_gem_subdirectories @gemhome
+
+    assert_path_exists File.join @gemhome, 'build_info'
+    assert_path_exists File.join @gemhome, 'cache'
+    assert_path_exists File.join @gemhome, 'doc'
+    assert_path_exists File.join @gemhome, 'extensions'
+    assert_path_exists File.join @gemhome, 'gems'
+    assert_path_exists File.join @gemhome, 'specifications'
+  end
+
+  def test_self_ensure_gem_directories_permissions
+    FileUtils.rm_r @gemhome
+    Gem.use_paths @gemhome
+
+    Gem.ensure_gem_subdirectories @gemhome, 0750
+
+    assert File.directory? File.join(@gemhome, "cache")
+
+    assert_equal 0750, File::Stat.new(@gemhome).mode & 0777
+    assert_equal 0750, File::Stat.new(File.join(@gemhome, "cache")).mode & 0777
+  end unless win_platform?
+
+  def test_self_ensure_gem_directories_safe_permissions
+    FileUtils.rm_r @gemhome
+    Gem.use_paths @gemhome
+
+    old_umask = File.umask
+    File.umask 0
+    Gem.ensure_gem_subdirectories @gemhome
+
+    assert_equal 0, File::Stat.new(@gemhome).mode & 002
+    assert_equal 0, File::Stat.new(File.join(@gemhome, "cache")).mode & 002
+  ensure
+    File.umask old_umask
+  end unless win_platform?
+
+  def test_self_ensure_gem_directories_missing_parents
+    gemdir = File.join @tempdir, 'a/b/c/gemdir'
+    FileUtils.rm_rf File.join(@tempdir, 'a') rescue nil
+    refute File.exist?(File.join(@tempdir, 'a')),
+           "manually remove #{File.join @tempdir, 'a'}, tests are broken"
+    Gem.use_paths gemdir
+
+    Gem.ensure_gem_subdirectories gemdir
+
+    assert File.directory?(util_cache_dir)
+  end
+
+  unless win_platform? then # only for FS that support write protection
+    def test_self_ensure_gem_directories_write_protected
+      gemdir = File.join @tempdir, "egd"
+      FileUtils.rm_r gemdir rescue nil
+      refute File.exist?(gemdir), "manually remove #{gemdir}, tests are broken"
+      FileUtils.mkdir_p gemdir
+      FileUtils.chmod 0400, gemdir
+      Gem.use_paths gemdir
+
+      Gem.ensure_gem_subdirectories gemdir
+
+      refute File.exist?(util_cache_dir)
+    ensure
+      FileUtils.chmod 0600, gemdir
+    end
+
+    def test_self_ensure_gem_directories_write_protected_parents
+      parent = File.join(@tempdir, "egd")
+      gemdir = "#{parent}/a/b/c"
+
+      FileUtils.rm_r parent rescue nil
+      refute File.exist?(parent), "manually remove #{parent}, tests are broken"
+      FileUtils.mkdir_p parent
+      FileUtils.chmod 0400, parent
+      Gem.use_paths(gemdir)
+
+      Gem.ensure_gem_subdirectories gemdir
+
+      refute File.exist? File.join(gemdir, "gems")
+    ensure
+      FileUtils.chmod 0600, parent
+    end
+  end
+
+  def test_self_extension_dir_shared
+    enable_shared 'yes' do
+      assert_equal Gem.ruby_api_version, Gem.extension_api_version
+    end
+  end
+
+  def test_self_extension_dir_static
+    enable_shared 'no' do
+      assert_equal "#{Gem.ruby_api_version}-static", Gem.extension_api_version
+    end
+  end
+
+  def test_self_find_files
+    cwd = File.expand_path("test/rubygems", @@project_dir)
+    $LOAD_PATH.unshift cwd
+
+    discover_path = File.join 'lib', 'sff', 'discover.rb'
+
+    foo1, foo2 = %w(1 2).map { |version|
+      spec = quick_gem 'sff', version do |s|
+        s.files << discover_path
+      end
+
+      write_file(File.join 'gems', spec.full_name, discover_path) do |fp|
+        fp.puts "# #{spec.full_name}"
+      end
+
+      spec
+    }
+
+    Gem.refresh
+
+    expected = [
+      File.expand_path('test/rubygems/sff/discover.rb', @@project_dir),
+      File.join(foo2.full_gem_path, discover_path),
+      File.join(foo1.full_gem_path, discover_path),
+    ]
+
+    assert_equal expected, Gem.find_files('sff/discover')
+    assert_equal expected, Gem.find_files('sff/**.rb'), '[ruby-core:31730]'
+  ensure
+    assert_equal cwd, $LOAD_PATH.shift
+  end
+
+  def test_self_find_latest_files
+    cwd = File.expand_path("test/rubygems", @@project_dir)
+    $LOAD_PATH.unshift cwd
+
+    discover_path = File.join 'lib', 'sff', 'discover.rb'
+
+    _, foo2 = %w(1 2).map { |version|
+      spec = quick_gem 'sff', version do |s|
+        s.files << discover_path
+      end
+
+      write_file(File.join 'gems', spec.full_name, discover_path) do |fp|
+        fp.puts "# #{spec.full_name}"
+      end
+
+      spec
+    }
+
+    Gem.refresh
+
+    expected = [
+      File.expand_path('test/rubygems/sff/discover.rb', @@project_dir),
+      File.join(foo2.full_gem_path, discover_path),
+    ]
+
+    assert_equal expected, Gem.find_latest_files('sff/discover')
+    assert_equal expected, Gem.find_latest_files('sff/**.rb'), '[ruby-core:31730]'
+  ensure
+    assert_equal cwd, $LOAD_PATH.shift
+  end
+
+  def test_self_latest_spec_for
+    gems = spec_fetcher do |fetcher|
+      fetcher.spec 'a', 1
+      fetcher.spec 'a', '3.a'
+      fetcher.spec 'a', 2
+    end
+
+    spec = Gem.latest_spec_for 'a'
+
+    assert_equal gems['a-2'], spec
+  end
+
+  def test_self_latest_rubygems_version
+    spec_fetcher do |fetcher|
+      fetcher.spec 'rubygems-update', '1.8.23'
+      fetcher.spec 'rubygems-update', '1.8.24'
+      fetcher.spec 'rubygems-update', '2.0.0.preview3'
+    end
+
+    version = Gem.latest_rubygems_version
+
+    assert_equal Gem::Version.new('1.8.24'), version
+  end
+
+  def test_self_latest_version_for
+    spec_fetcher do |fetcher|
+      fetcher.spec 'a', 1
+      fetcher.spec 'a', 2
+      fetcher.spec 'a', '3.a'
+    end
+
+    version = Gem.latest_version_for 'a'
+
+    assert_equal Gem::Version.new(2), version
+  end
+
+  def test_self_loaded_specs
+    foo = util_spec 'foo'
+    install_gem foo
+
+    foo.activate
+
+    assert_equal true, Gem.loaded_specs.keys.include?('foo')
+  end
+
+  def util_path
+    ENV.delete "GEM_HOME"
+    ENV.delete "GEM_PATH"
+  end
+
+  def test_self_path
+    assert_equal [Gem.dir], Gem.path
+  end
+
+  def test_self_path_default
+    util_path
+
+    if defined?(APPLE_GEM_HOME)
+      orig_APPLE_GEM_HOME = APPLE_GEM_HOME
+      Object.send :remove_const, :APPLE_GEM_HOME
+    end
+
+    Gem.instance_variable_set :@paths, nil
+
+    assert_equal [Gem.default_path, Gem.dir].flatten.uniq, Gem.path
+  ensure
+    Object.const_set :APPLE_GEM_HOME, orig_APPLE_GEM_HOME if orig_APPLE_GEM_HOME
+  end
+
+  unless win_platform?
+    def test_self_path_APPLE_GEM_HOME
+      util_path
+
+      Gem.clear_paths
+      apple_gem_home = File.join @tempdir, 'apple_gem_home'
+
+      old, $-w = $-w, nil
+      Object.const_set :APPLE_GEM_HOME, apple_gem_home
+      $-w = old
+
+      assert_includes Gem.path, apple_gem_home
+    ensure
+      Object.send :remove_const, :APPLE_GEM_HOME
+    end
+
+    def test_self_path_APPLE_GEM_HOME_GEM_PATH
+      Gem.clear_paths
+      ENV['GEM_PATH'] = @gemhome
+      apple_gem_home = File.join @tempdir, 'apple_gem_home'
+      Gem.const_set :APPLE_GEM_HOME, apple_gem_home
+
+      refute Gem.path.include?(apple_gem_home)
+    ensure
+      Gem.send :remove_const, :APPLE_GEM_HOME
+    end
+  end
+
+  def test_self_path_ENV_PATH
+    path_count = Gem.path.size
+    Gem.clear_paths
+
+    ENV['GEM_PATH'] = @additional.join(File::PATH_SEPARATOR)
+
+    assert_equal @additional, Gem.path[0,2]
+
+    assert_equal path_count + @additional.size, Gem.path.size,
+                 "extra path components: #{Gem.path[2..-1].inspect}"
+    assert_equal Gem.dir, Gem.path.last
+  end
+
+  def test_self_path_duplicate
+    Gem.clear_paths
+    util_ensure_gem_dirs
+    dirs = @additional + [@gemhome] + [File.join(@tempdir, 'a')]
+
+    ENV['GEM_HOME'] = @gemhome
+    ENV['GEM_PATH'] = dirs.join File::PATH_SEPARATOR
+
+    assert_equal @gemhome, Gem.dir
+
+    paths = [Gem.dir]
+    assert_equal @additional + paths, Gem.path
+  end
+
+  def test_self_path_overlap
+    Gem.clear_paths
+
+    util_ensure_gem_dirs
+    ENV['GEM_HOME'] = @gemhome
+    ENV['GEM_PATH'] = @additional.join(File::PATH_SEPARATOR)
+
+    assert_equal @gemhome, Gem.dir
+
+    paths = [Gem.dir]
+    assert_equal @additional + paths, Gem.path
+  end
+
+  def test_self_platforms
+    assert_equal [Gem::Platform::RUBY, Gem::Platform.local], Gem.platforms
+  end
+
+  def test_self_prefix
+    assert_equal @@project_dir, Gem.prefix
+  end
+
+  def test_self_prefix_libdir
+    orig_libdir = RbConfig::CONFIG['libdir']
+    RbConfig::CONFIG['libdir'] = @@project_dir
+
+    assert_nil Gem.prefix
+  ensure
+    RbConfig::CONFIG['libdir'] = orig_libdir
+  end
+
+  def test_self_prefix_sitelibdir
+    orig_sitelibdir = RbConfig::CONFIG['sitelibdir']
+    RbConfig::CONFIG['sitelibdir'] = @@project_dir
+
+    assert_nil Gem.prefix
+  ensure
+    RbConfig::CONFIG['sitelibdir'] = orig_sitelibdir
+  end
+
+  def test_self_read_binary
+    open 'test', 'w' do |io|
+      io.write "\xCF\x80"
+    end
+
+    assert_equal ["\xCF", "\x80"], Gem.read_binary('test').chars.to_a
+
+    skip 'chmod not supported' if Gem.win_platform?
+
+    begin
+      File.chmod 0444, 'test'
+
+      assert_equal ["\xCF", "\x80"], Gem.read_binary('test').chars.to_a
+    ensure
+      File.chmod 0644, 'test'
+    end
+  end
+
+  def test_self_refresh
+    skip 'Insecure operation - mkdir' if RUBY_VERSION <= "1.8.7"
+    util_make_gems
+
+    a1_spec = @a1.spec_file
+    moved_path = File.join @tempdir, File.basename(a1_spec)
+
+    FileUtils.mv a1_spec, moved_path
+
+    Gem.refresh
+
+    refute_includes Gem::Specification.all_names, @a1.full_name
+
+    FileUtils.mv moved_path, a1_spec
+
+    Gem.refresh
+
+    assert_includes Gem::Specification.all_names, @a1.full_name
+  end
+
+  def test_self_refresh_keeps_loaded_specs_activated
+    skip 'Insecure operation - mkdir' if RUBY_VERSION <= "1.8.7"
+    util_make_gems
+
+    a1_spec = @a1.spec_file
+    moved_path = File.join @tempdir, File.basename(a1_spec)
+
+    FileUtils.mv a1_spec, moved_path
+
+    Gem.refresh
+
+    s = Gem::Specification.first
+    s.activate
+
+    Gem.refresh
+
+    Gem::Specification.each{|spec| assert spec.activated? if spec == s}
+
+    Gem.loaded_specs.delete(s)
+    Gem.refresh
+  end
+
+  def test_self_ruby_escaping_spaces_in_path
+    orig_ruby = Gem.ruby
+    orig_bindir = RbConfig::CONFIG['bindir']
+    orig_ruby_install_name = RbConfig::CONFIG['ruby_install_name']
+    orig_exe_ext = RbConfig::CONFIG['EXEEXT']
+
+    RbConfig::CONFIG['bindir'] = "C:/Ruby 1.8/bin"
+    RbConfig::CONFIG['ruby_install_name'] = "ruby"
+    RbConfig::CONFIG['EXEEXT'] = ".exe"
+    Gem.instance_variable_set("@ruby", nil)
+
+    assert_equal "\"C:/Ruby 1.8/bin/ruby.exe\"", Gem.ruby
+  ensure
+    Gem.instance_variable_set("@ruby", orig_ruby)
+    RbConfig::CONFIG['bindir'] = orig_bindir
+    RbConfig::CONFIG['ruby_install_name'] = orig_ruby_install_name
+    RbConfig::CONFIG['EXEEXT'] = orig_exe_ext
+  end
+
+  def test_self_ruby_path_without_spaces
+    orig_ruby = Gem.ruby
+    orig_bindir = RbConfig::CONFIG['bindir']
+    orig_ruby_install_name = RbConfig::CONFIG['ruby_install_name']
+    orig_exe_ext = RbConfig::CONFIG['EXEEXT']
+
+    RbConfig::CONFIG['bindir'] = "C:/Ruby18/bin"
+    RbConfig::CONFIG['ruby_install_name'] = "ruby"
+    RbConfig::CONFIG['EXEEXT'] = ".exe"
+    Gem.instance_variable_set("@ruby", nil)
+
+    assert_equal "C:/Ruby18/bin/ruby.exe", Gem.ruby
+  ensure
+    Gem.instance_variable_set("@ruby", orig_ruby)
+    RbConfig::CONFIG['bindir'] = orig_bindir
+    RbConfig::CONFIG['ruby_install_name'] = orig_ruby_install_name
+    RbConfig::CONFIG['EXEEXT'] = orig_exe_ext
+  end
+
+  def test_self_ruby_api_version
+    orig_ruby_version, RbConfig::CONFIG['ruby_version'] = RbConfig::CONFIG['ruby_version'], '1.2.3'
+
+    Gem.instance_variable_set :@ruby_api_version, nil
+
+    assert_equal '1.2.3', Gem.ruby_api_version
+  ensure
+    Gem.instance_variable_set :@ruby_api_version, nil
+
+    RbConfig::CONFIG['ruby_version'] = orig_ruby_version
+  end
+
+  def test_self_ruby_version_1_8_5
+    util_set_RUBY_VERSION '1.8.5'
+
+    assert_equal Gem::Version.new('1.8.5'), Gem.ruby_version
+  ensure
+    util_restore_RUBY_VERSION
+  end
+
+  def test_self_ruby_version_1_8_6p287
+    util_set_RUBY_VERSION '1.8.6', 287
+
+    assert_equal Gem::Version.new('1.8.6.287'), Gem.ruby_version
+  ensure
+    util_restore_RUBY_VERSION
+  end
+
+  def test_self_ruby_version_1_9_2dev_r23493
+    util_set_RUBY_VERSION '1.9.2', -1, 23493
+
+    assert_equal Gem::Version.new('1.9.2.dev.23493'), Gem.ruby_version
+  ensure
+    util_restore_RUBY_VERSION
+  end
+
+  def test_self_rubygems_version
+    assert_equal Gem::Version.new(Gem::VERSION), Gem.rubygems_version
+  end
+
+  def test_self_paths_eq
+    other = File.join @tempdir, 'other'
+    path = [@userhome, other].join File::PATH_SEPARATOR
+
+    #
+    # FIXME remove after fixing test_case
+    #
+    ENV["GEM_HOME"] = @gemhome
+    Gem.paths = { "GEM_PATH" => path }
+
+    assert_equal [@userhome, other, @gemhome], Gem.path
+  end
+
+  def test_self_paths_eq_nonexistent_home
+    ENV['GEM_HOME'] = @gemhome
+    Gem.clear_paths
+
+    other = File.join @tempdir, 'other'
+
+    ENV['HOME'] = other
+
+    Gem.paths = { "GEM_PATH" => other }
+
+    assert_equal [other, @gemhome], Gem.path
+  end
+
+  def test_self_post_build
+    assert_equal 1, Gem.post_build_hooks.length
+
+    Gem.post_build do |installer| end
+
+    assert_equal 2, Gem.post_build_hooks.length
+  end
+
+  def test_self_post_install
+    assert_equal 1, Gem.post_install_hooks.length
+
+    Gem.post_install do |installer| end
+
+    assert_equal 2, Gem.post_install_hooks.length
+  end
+
+  def test_self_done_installing
+    assert_empty Gem.done_installing_hooks
+
+    Gem.done_installing do |gems| end
+
+    assert_equal 1, Gem.done_installing_hooks.length
+  end
+
+  def test_self_post_reset
+    assert_empty Gem.post_reset_hooks
+
+    Gem.post_reset { }
+
+    assert_equal 1, Gem.post_reset_hooks.length
+  end
+
+  def test_self_post_uninstall
+    assert_equal 1, Gem.post_uninstall_hooks.length
+
+    Gem.post_uninstall do |installer| end
+
+    assert_equal 2, Gem.post_uninstall_hooks.length
+  end
+
+  def test_self_pre_install
+    assert_equal 1, Gem.pre_install_hooks.length
+
+    Gem.pre_install do |installer| end
+
+    assert_equal 2, Gem.pre_install_hooks.length
+  end
+
+  def test_self_pre_reset
+    assert_empty Gem.pre_reset_hooks
+
+    Gem.pre_reset { }
+
+    assert_equal 1, Gem.pre_reset_hooks.length
+  end
+
+  def test_self_pre_uninstall
+    assert_equal 1, Gem.pre_uninstall_hooks.length
+
+    Gem.pre_uninstall do |installer| end
+
+    assert_equal 2, Gem.pre_uninstall_hooks.length
+  end
+
+  def test_self_sources
+    assert_equal %w[http://gems.example.com/], Gem.sources
+  end
+
+  def test_self_try_activate_missing_dep
+    a = util_spec 'a', '1.0', 'b' => '>= 1.0'
+
+    a_file = File.join a.gem_dir, 'lib', 'a_file.rb'
+
+    write_file a_file do |io|
+      io.puts '# a_file.rb'
+    end
+
+    e = assert_raises Gem::LoadError do
+      Gem.try_activate 'a_file'
+    end
+
+    assert_match %r%Could not find 'b' %, e.message
+  end
+
+  def test_self_try_activate_missing_extensions
+    util_spec 'ext', '1' do |s|
+      s.extensions = %w[ext/extconf.rb]
+      s.mark_version
+      s.installed_by_version = v('2.2')
+    end
+
+    _, err = capture_io do
+      refute Gem.try_activate 'nonexistent'
+    end
+
+    expected = "Ignoring ext-1 because its extensions are not built.  " +
+               "Try: gem pristine ext --version 1\n"
+
+    assert_equal expected, err
+  end
+
+  def test_self_use_paths
+    util_ensure_gem_dirs
+
+    Gem.use_paths @gemhome, @additional
+
+    assert_equal @gemhome, Gem.dir
+    assert_equal @additional + [Gem.dir], Gem.path
+  end
+
+  def test_self_user_dir
+    parts = [@userhome, '.gem', Gem.ruby_engine]
+    parts << RbConfig::CONFIG['ruby_version'] unless RbConfig::CONFIG['ruby_version'].empty?
+
+    assert_equal File.join(parts), Gem.user_dir
+  end
+
+  def test_self_user_home
+    if ENV['HOME'] then
+      assert_equal ENV['HOME'], Gem.user_home
+    else
+      assert true, 'count this test'
+    end
+  end
+
+  def test_self_needs
+    util_clear_gems
+    a = util_spec "a", "1"
+    b = util_spec "b", "1", "c" => nil
+    c = util_spec "c", "2"
+
+    install_specs a, b, c
+
+    Gem.needs do |r|
+      r.gem "a"
+      r.gem "b", "= 1"
+    end
+
+    activated = Gem::Specification.map { |x| x.full_name }
+
+    assert_equal %w!a-1 b-1 c-2!, activated.sort
+  end
+
+  def test_self_needs_picks_up_unresolved_deps
+    skip 'loading from unsafe file' if RUBY_VERSION <= "1.8.7"
+    save_loaded_features do
+      util_clear_gems
+      a = util_spec "a", "1"
+      b = util_spec "b", "1", "c" => nil
+      c = util_spec "c", "2"
+      d =  new_spec "d", "1", {'e' => '= 1'}, "lib/d.rb"
+      e = util_spec "e", "1"
+
+      install_specs a, b, c, d, e
+
+      Gem.needs do |r|
+        r.gem "a"
+        r.gem "b", "= 1"
+
+        require 'd'
+      end
+
+      assert_equal %w!a-1 b-1 c-2 d-1 e-1!, loaded_spec_names
+    end
+  end
+
+  def test_self_gunzip
+    input = "\x1F\x8B\b\0\xED\xA3\x1AQ\0\x03\xCBH" +
+            "\xCD\xC9\xC9\a\0\x86\xA6\x106\x05\0\0\0"
+
+    output = Gem.gunzip input
+
+    assert_equal 'hello', output
+
+    return unless Object.const_defined? :Encoding
+
+    assert_equal Encoding::BINARY, output.encoding
+  end
+
+  def test_self_gzip
+    input = 'hello'
+
+    output = Gem.gzip input
+
+    zipped = StringIO.new output
+
+    assert_equal 'hello', Zlib::GzipReader.new(zipped).read
+
+    return unless Object.const_defined? :Encoding
+
+    assert_equal Encoding::BINARY, output.encoding
+  end
+
+  if Gem.win_platform? && '1.9' > RUBY_VERSION
+    # Ruby 1.9 properly handles ~ path expansion, so no need to run such tests.
+    def test_self_user_home_userprofile
+
+      Gem.clear_paths
+
+      # safe-keep env variables
+      orig_home, orig_user_profile = ENV['HOME'], ENV['USERPROFILE']
+
+      # prepare for the test
+      ENV.delete('HOME')
+      ENV['USERPROFILE'] = "W:\\Users\\RubyUser"
+
+      assert_equal 'W:/Users/RubyUser', Gem.user_home
+
+    ensure
+      ENV['HOME'] = orig_home
+      ENV['USERPROFILE'] = orig_user_profile
+    end
+
+    def test_self_user_home_user_drive_and_path
+      Gem.clear_paths
+
+      # safe-keep env variables
+      orig_home, orig_user_profile = ENV['HOME'], ENV['USERPROFILE']
+      orig_home_drive, orig_home_path = ENV['HOMEDRIVE'], ENV['HOMEPATH']
+
+      # prepare the environment
+      ENV.delete('HOME')
+      ENV.delete('USERPROFILE')
+      ENV['HOMEDRIVE'] = 'Z:'
+      ENV['HOMEPATH'] = "\\Users\\RubyUser"
+
+      assert_equal 'Z:/Users/RubyUser', Gem.user_home
+
+    ensure
+      ENV['HOME'] = orig_home
+      ENV['USERPROFILE'] = orig_user_profile
+      ENV['HOMEDRIVE'] = orig_home_drive
+      ENV['HOMEPATH'] = orig_home_path
+    end
+  end
+
+  def test_self_vendor_dir
+    expected =
+      File.join RbConfig::CONFIG['vendordir'], 'gems',
+                RbConfig::CONFIG['ruby_version']
+
+    assert_equal expected, Gem.vendor_dir
+  end
+
+  def test_self_vendor_dir_ENV_GEM_VENDOR
+    ENV['GEM_VENDOR'] = File.join @tempdir, 'vendor', 'gems'
+
+    assert_equal ENV['GEM_VENDOR'], Gem.vendor_dir
+    refute Gem.vendor_dir.frozen?
+  end
+
+  def test_self_vendor_dir_missing
+    orig_vendordir = RbConfig::CONFIG['vendordir']
+    RbConfig::CONFIG.delete 'vendordir'
+
+    assert_nil Gem.vendor_dir
+  ensure
+    RbConfig::CONFIG['vendordir'] = orig_vendordir
+  end
+
+  def test_load_plugins
+    skip 'Insecure operation - chdir' if RUBY_VERSION <= "1.8.7"
+    plugin_path = File.join "lib", "rubygems_plugin.rb"
+
+    Dir.chdir @tempdir do
+      FileUtils.mkdir_p 'lib'
+      File.open plugin_path, "w" do |fp|
+        fp.puts "class TestGem; PLUGINS_LOADED << 'plugin'; end"
+      end
+
+      foo1 = util_spec 'foo', '1' do |s|
+        s.files << plugin_path
+      end
+
+      install_gem foo1
+
+      foo2 = util_spec 'foo', '2' do |s|
+        s.files << plugin_path
+      end
+
+      install_gem foo2
+    end
+
+    Gem.searcher = nil
+    Gem::Specification.reset
+
+    gem 'foo'
+
+    Gem.load_plugins
+
+    assert_equal %w[plugin], PLUGINS_LOADED
+  end
+
+  def test_load_env_plugins
+    with_plugin('load') { Gem.load_env_plugins }
+    assert_equal :loaded, TEST_PLUGIN_LOAD rescue nil
+
+    util_remove_interrupt_command
+
+    # Should attempt to cause a StandardError
+    with_plugin('standarderror') { Gem.load_env_plugins }
+    assert_equal :loaded, TEST_PLUGIN_STANDARDERROR rescue nil
+
+    util_remove_interrupt_command
+
+    # Should attempt to cause an Exception
+    with_plugin('exception') { Gem.load_env_plugins }
+    assert_equal :loaded, TEST_PLUGIN_EXCEPTION rescue nil
+  end
+
+  def test_gem_path_ordering
+    refute_equal Gem.dir, Gem.user_dir
+
+    write_file File.join(@tempdir, 'lib', "g.rb") { |fp| fp.puts "" }
+    write_file File.join(@tempdir, 'lib', 'm.rb') { |fp| fp.puts "" }
+
+    g = new_spec 'g', '1', nil, "lib/g.rb"
+    m = new_spec 'm', '1', nil, "lib/m.rb"
+
+    install_gem g, :install_dir => Gem.dir
+    m0 = install_gem m, :install_dir => Gem.dir
+    m1 = install_gem m, :install_dir => Gem.user_dir
+
+    assert_equal m0.gem_dir, File.join(Gem.dir, "gems", "m-1")
+    assert_equal m1.gem_dir, File.join(Gem.user_dir, "gems", "m-1")
+
+    tests = [
+      [:dir0, [ Gem.dir, Gem.user_dir], m0],
+      [:dir1, [ Gem.user_dir, Gem.dir], m1]
+    ]
+
+    tests.each do |_name, _paths, expected|
+      Gem.paths = { 'GEM_HOME' => _paths.first, 'GEM_PATH' => _paths }
+      Gem::Specification.reset
+      Gem.searcher = nil
+
+      assert_equal Gem::Dependency.new('m','1').to_specs,
+                   Gem::Dependency.new('m','1').to_specs.sort
+
+      assert_equal \
+        [expected.gem_dir],
+        Gem::Dependency.new('m','1').to_specs.map(&:gem_dir).sort,
+        "Wrong specs for #{_name}"
+
+      spec = Gem::Dependency.new('m','1').to_spec
+
+      assert_equal \
+        File.join(_paths.first, "gems", "m-1"),
+        spec.gem_dir,
+        "Wrong spec before require for #{_name}"
+      refute spec.activated?, "dependency already activated for #{_name}"
+
+      gem "m"
+
+      spec = Gem::Dependency.new('m','1').to_spec
+      assert spec.activated?, "dependency not activated for #{_name}"
+
+      assert_equal \
+        File.join(_paths.first, "gems", "m-1"),
+        spec.gem_dir,
+        "Wrong spec after require for #{_name}"
+
+      spec.instance_variable_set :@activated, false
+      Gem.loaded_specs.delete(spec.name)
+      $:.delete(File.join(spec.gem_dir, "lib"))
+    end
+  end
+
+  def test_gem_path_ordering_short
+    write_file File.join(@tempdir, 'lib', "g.rb") { |fp| fp.puts "" }
+    write_file File.join(@tempdir, 'lib', 'm.rb') { |fp| fp.puts "" }
+
+    g = new_spec 'g', '1', nil, "lib/g.rb"
+    m = new_spec 'm', '1', nil, "lib/m.rb"
+
+    install_gem g, :install_dir => Gem.dir
+    install_gem m, :install_dir => Gem.dir
+    install_gem m, :install_dir => Gem.user_dir
+
+    Gem.paths = {
+      'GEM_HOME' => Gem.dir,
+      'GEM_PATH' => [ Gem.dir, Gem.user_dir]
+    }
+
+    assert_equal \
+      File.join(Gem.dir, "gems", "m-1"),
+      Gem::Dependency.new('m','1').to_spec.gem_dir,
+      "Wrong spec selected"
+  end
+
+  def test_auto_activation_of_specific_gemdeps_file
+    util_clear_gems
+
+    a = new_spec "a", "1", nil, "lib/a.rb"
+    b = new_spec "b", "1", nil, "lib/b.rb"
+    c = new_spec "c", "1", nil, "lib/c.rb"
+
+    install_specs a, b, c
+
+    path = File.join @tempdir, "gem.deps.rb"
+
+    File.open path, "w" do |f|
+      f.puts "gem 'a'"
+      f.puts "gem 'b'"
+      f.puts "gem 'c'"
+    end
+
+    ENV['RUBYGEMS_GEMDEPS'] = path
+
+    Gem.detect_gemdeps
+
+    assert_equal %w!a-1 b-1 c-1!, loaded_spec_names
+  end
+
+  def test_auto_activation_of_detected_gemdeps_file
+    skip 'Insecure operation - chdir' if RUBY_VERSION <= "1.8.7"
+    util_clear_gems
+
+    a = new_spec "a", "1", nil, "lib/a.rb"
+    b = new_spec "b", "1", nil, "lib/b.rb"
+    c = new_spec "c", "1", nil, "lib/c.rb"
+
+    install_specs a, b, c
+
+    path = File.join @tempdir, "gem.deps.rb"
+
+    File.open path, "w" do |f|
+      f.puts "gem 'a'"
+      f.puts "gem 'b'"
+      f.puts "gem 'c'"
+    end
+
+    ENV['RUBYGEMS_GEMDEPS'] = "-"
+
+    assert_equal [a,b,c], Gem.detect_gemdeps.sort_by { |s| s.name }
+  end
+
+  LIB_PATH = File.expand_path "../../../lib".untaint, __FILE__.untaint
+
+  def test_looks_for_gemdeps_files_automatically_on_start
+    util_clear_gems
+
+    a = new_spec "a", "1", nil, "lib/a.rb"
+    b = new_spec "b", "1", nil, "lib/b.rb"
+    c = new_spec "c", "1", nil, "lib/c.rb"
+
+    install_specs a, b, c
+
+    path = File.join @tempdir, "gem.deps.rb"
+
+    File.open path, "w" do |f|
+      f.puts "gem 'a'"
+      f.puts "gem 'b'"
+      f.puts "gem 'c'"
+    end
+
+    path = File.join(@tempdir, "gd-tmp")
+    install_gem a, :install_dir => path
+    install_gem b, :install_dir => path
+    install_gem c, :install_dir => path
+
+    ENV['GEM_PATH'] = path
+    ENV['RUBYGEMS_GEMDEPS'] = "-"
+
+    out = `#{Gem.ruby.dup.untaint} -I #{LIB_PATH.untaint} -rubygems -e "p Gem.loaded_specs.values.map(&:full_name).sort"`
+
+    assert_equal '["a-1", "b-1", "c-1"]', out.strip
+  end
+
+  def test_looks_for_gemdeps_files_automatically_on_start_in_parent_dir
+    util_clear_gems
+
+    a = new_spec "a", "1", nil, "lib/a.rb"
+    b = new_spec "b", "1", nil, "lib/b.rb"
+    c = new_spec "c", "1", nil, "lib/c.rb"
+
+    install_specs a, b, c
+
+    path = File.join @tempdir, "gem.deps.rb"
+
+    File.open path, "w" do |f|
+      f.puts "gem 'a'"
+      f.puts "gem 'b'"
+      f.puts "gem 'c'"
+    end
+
+    path = File.join(@tempdir, "gd-tmp")
+    install_gem a, :install_dir => path
+    install_gem b, :install_dir => path
+    install_gem c, :install_dir => path
+
+    ENV['GEM_PATH'] = path
+    ENV['RUBYGEMS_GEMDEPS'] = "-"
+
+    Dir.mkdir "sub1"
+    out = Dir.chdir "sub1" do
+      `#{Gem.ruby.dup.untaint} -I #{LIB_PATH.untaint} -rubygems -e "p Gem.loaded_specs.values.map(&:full_name).sort"`
+    end
+
+    Dir.rmdir "sub1"
+
+    assert_equal '["a-1", "b-1", "c-1"]', out.strip
+  end
+
+  def test_register_default_spec
+    Gem.clear_default_specs
+
+    old_style = Gem::Specification.new do |spec|
+      spec.files = ["foo.rb", "bar.rb"]
+    end
+
+    Gem.register_default_spec old_style
+
+    assert_equal old_style, Gem.find_unresolved_default_spec("foo.rb")
+    assert_equal old_style, Gem.find_unresolved_default_spec("bar.rb")
+    assert_equal nil, Gem.find_unresolved_default_spec("baz.rb")
+
+    Gem.clear_default_specs
+
+    new_style = Gem::Specification.new do |spec|
+      spec.files = ["lib/foo.rb", "ext/bar.rb", "bin/exec", "README"]
+      spec.require_paths = ["lib", "ext"]
+    end
+
+    Gem.register_default_spec new_style
+
+    assert_equal new_style, Gem.find_unresolved_default_spec("foo.rb")
+    assert_equal new_style, Gem.find_unresolved_default_spec("bar.rb")
+    assert_equal nil, Gem.find_unresolved_default_spec("exec")
+    assert_equal nil, Gem.find_unresolved_default_spec("README")
+  end
+
+  def test_default_gems_use_full_paths
+    begin
+      if defined?(RUBY_ENGINE) then
+        engine = RUBY_ENGINE
+        Object.send :remove_const, :RUBY_ENGINE
+      end
+      Object.const_set :RUBY_ENGINE, 'ruby'
+
+      refute Gem.default_gems_use_full_paths?
+    ensure
+      Object.send :remove_const, :RUBY_ENGINE
+      Object.const_set :RUBY_ENGINE, engine if engine
+    end
+
+    begin
+      if defined?(RUBY_ENGINE) then
+        engine = RUBY_ENGINE
+        Object.send :remove_const, :RUBY_ENGINE
+      end
+      Object.const_set :RUBY_ENGINE, 'jruby'
+      assert Gem.default_gems_use_full_paths?
+    ensure
+      Object.send :remove_const, :RUBY_ENGINE
+      Object.const_set :RUBY_ENGINE, engine if engine
+    end
+  end
+
+  def test_use_gemdeps
+    gem_deps_file = 'gem.deps.rb'.untaint
+    spec = util_spec 'a', 1
+
+    refute spec.activated?
+
+    open gem_deps_file, 'w' do |io|
+      io.write 'gem "a"'
+    end
+
+    Gem.use_gemdeps gem_deps_file
+
+    assert spec.activated?
+  end
+
+  def test_use_gemdeps_ENV
+    rubygems_gemdeps, ENV['RUBYGEMS_GEMDEPS'] = ENV['RUBYGEMS_GEMDEPS'], nil
+
+    spec = util_spec 'a', 1
+
+    refute spec.activated?
+
+    open 'gem.deps.rb', 'w' do |io|
+      io.write 'gem "a"'
+    end
+
+    Gem.use_gemdeps
+
+    refute spec.activated?
+  ensure
+    ENV['RUBYGEMS_GEMDEPS'] = rubygems_gemdeps
+  end
+
+  def test_use_gemdeps_argument_missing
+    e = assert_raises ArgumentError do
+      Gem.use_gemdeps 'gem.deps.rb'
+    end
+
+    assert_equal 'Unable to find gem dependencies file at gem.deps.rb',
+                 e.message
+  end
+
+  def test_use_gemdeps_argument_missing_match_ENV
+    rubygems_gemdeps, ENV['RUBYGEMS_GEMDEPS'] =
+      ENV['RUBYGEMS_GEMDEPS'], 'gem.deps.rb'
+
+    e = assert_raises ArgumentError do
+      Gem.use_gemdeps 'gem.deps.rb'
+    end
+
+    assert_equal 'Unable to find gem dependencies file at gem.deps.rb',
+                 e.message
+  ensure
+    ENV['RUBYGEMS_GEMDEPS'] = rubygems_gemdeps
+  end
+
+  def test_use_gemdeps_automatic
+    skip 'Insecure operation - chdir' if RUBY_VERSION <= "1.8.7"
+    rubygems_gemdeps, ENV['RUBYGEMS_GEMDEPS'] = ENV['RUBYGEMS_GEMDEPS'], '-'
+
+    spec = util_spec 'a', 1
+
+    refute spec.activated?
+
+    open 'Gemfile', 'w' do |io|
+      io.write 'gem "a"'
+    end
+
+    Gem.use_gemdeps
+
+    assert spec.activated?
+  ensure
+    ENV['RUBYGEMS_GEMDEPS'] = rubygems_gemdeps
+  end
+
+  def test_use_gemdeps_automatic_missing
+    skip 'Insecure operation - chdir' if RUBY_VERSION <= "1.8.7"
+    rubygems_gemdeps, ENV['RUBYGEMS_GEMDEPS'] = ENV['RUBYGEMS_GEMDEPS'], '-'
+
+    Gem.use_gemdeps
+
+    assert true # count
+  ensure
+    ENV['RUBYGEMS_GEMDEPS'] = rubygems_gemdeps
+  end
+
+  def test_use_gemdeps_disabled
+    rubygems_gemdeps, ENV['RUBYGEMS_GEMDEPS'] = ENV['RUBYGEMS_GEMDEPS'], ''
+
+    spec = util_spec 'a', 1
+
+    refute spec.activated?
+
+    open 'gem.deps.rb', 'w' do |io|
+      io.write 'gem "a"'
+    end
+
+    Gem.use_gemdeps
+
+    refute spec.activated?
+  ensure
+    ENV['RUBYGEMS_GEMDEPS'] = rubygems_gemdeps
+  end
+
+  def test_use_gemdeps_missing_gem
+    skip 'Insecure operation - read' if RUBY_VERSION <= "1.8.7"
+    rubygems_gemdeps, ENV['RUBYGEMS_GEMDEPS'] = ENV['RUBYGEMS_GEMDEPS'], 'x'
+
+    open 'x', 'w' do |io|
+      io.write 'gem "a"'
+    end
+
+    expected = <<-EXPECTED
+Unable to resolve dependency: user requested 'a (>= 0)'
+You may need to `gem install -g` to install missing gems
+
+    EXPECTED
+
+    assert_output nil, expected do
+      Gem.use_gemdeps
+    end
+  ensure
+    ENV['RUBYGEMS_GEMDEPS'] = rubygems_gemdeps
+  end
+
+  def test_use_gemdeps_specific
+    skip 'Insecure operation - read' if RUBY_VERSION <= "1.8.7"
+    rubygems_gemdeps, ENV['RUBYGEMS_GEMDEPS'] = ENV['RUBYGEMS_GEMDEPS'], 'x'
+
+    spec = util_spec 'a', 1
+
+    refute spec.activated?
+
+    open 'x', 'w' do |io|
+      io.write 'gem "a"'
+    end
+
+    Gem.use_gemdeps
+
+    assert spec.activated?
+  ensure
+    ENV['RUBYGEMS_GEMDEPS'] = rubygems_gemdeps
+  end
+
+  def ruby_install_name name
+    orig_RUBY_INSTALL_NAME = RbConfig::CONFIG['ruby_install_name']
+    RbConfig::CONFIG['ruby_install_name'] = name
+
+    yield
+  ensure
+    if orig_RUBY_INSTALL_NAME then
+      RbConfig::CONFIG['ruby_install_name'] = orig_RUBY_INSTALL_NAME
+    else
+      RbConfig::CONFIG.delete 'ruby_install_name'
+    end
+  end
+
+  def with_plugin(path)
+    test_plugin_path = File.expand_path("test/rubygems/plugin/#{path}",
+                                        @@project_dir)
+
+    # A single test plugin should get loaded once only, in order to preserve
+    # sane test semantics.
+    refute_includes $LOAD_PATH, test_plugin_path
+    $LOAD_PATH.unshift test_plugin_path
+
+    capture_io do
+      yield
+    end
+  ensure
+    $LOAD_PATH.delete test_plugin_path
+  end
+
+  def util_ensure_gem_dirs
+    Gem.ensure_gem_subdirectories @gemhome
+
+    #
+    # FIXME what does this solve precisely? -ebh
+    #
+    @additional.each do |dir|
+      Gem.ensure_gem_subdirectories @gemhome
+    end
+  end
+
+  def util_exec_gem
+    spec, _ = util_spec 'a', '4' do |s|
+      s.executables = ['exec', 'abin']
+    end
+
+    @exec_path = File.join spec.full_gem_path, spec.bindir, 'exec'
+    @abin_path = File.join spec.full_gem_path, spec.bindir, 'abin'
+  end
+
+  def util_remove_interrupt_command
+    Gem::Commands.send :remove_const, :InterruptCommand if
+      Gem::Commands.const_defined? :InterruptCommand
+  end
+
+  def util_cache_dir
+    File.join Gem.dir, "cache"
+  end
+end