setup

# File lib/rubygems/test_case.rb, line 220
  def setup
    super

    @orig_gem_home   = ENV['GEM_HOME']
    @orig_gem_path   = ENV['GEM_PATH']
    @orig_gem_vendor = ENV['GEM_VENDOR']
    @orig_gem_spec_cache = ENV['GEM_SPEC_CACHE']
    @orig_rubygems_gemdeps = ENV['RUBYGEMS_GEMDEPS']
    @orig_bundle_gemfile   = ENV['BUNDLE_GEMFILE']
    @orig_rubygems_host = ENV['RUBYGEMS_HOST']
    ENV.keys.find_all { |k| k.start_with?('GEM_REQUIREMENT_') }.each do |k|
      ENV.delete k
    end
    @orig_gem_env_requirements = ENV.to_hash

    ENV['GEM_VENDOR'] = nil

    @current_dir = Dir.pwd
    @fetcher     = nil

    if Gem::USE_BUNDLER_FOR_GEMDEPS
      Bundler.ui                     = Bundler::UI::Silent.new
    end
    @back_ui                       = Gem::DefaultUserInteraction.ui
    @ui                            = Gem::MockGemUi.new
    # This needs to be a new instance since we call use_ui(@ui) when we want to
    # capture output
    Gem::DefaultUserInteraction.ui = Gem::MockGemUi.new

    tmpdir = File.expand_path Dir.tmpdir
    tmpdir.untaint

    if ENV['KEEP_FILES'] then
      @tempdir = File.join(tmpdir, "test_rubygems_#{$$}.#{Time.now.to_i}")
    else
      @tempdir = File.join(tmpdir, "test_rubygems_#{$$}")
    end
    @tempdir.untaint

    FileUtils.mkdir_p @tempdir

    # This makes the tempdir consistent on OS X.
    # File.expand_path Dir.tmpdir                      #=> "/var/..."
    # Dir.chdir Dir.tmpdir do File.expand_path '.' end #=> "/private/var/..."
    # TODO use File#realpath above instead of #expand_path once 1.8 support is
    # dropped.
    Dir.chdir @tempdir do
      @tempdir = File.expand_path '.'
      @tempdir.untaint
    end

    # This makes the tempdir consistent on Windows.
    # Dir.tmpdir may return short path name, but Dir[Dir.tmpdir] returns long
    # path name. https://bugs.ruby-lang.org/issues/10819
    # File.expand_path or File.realpath doesn't convert path name to long path
    # name. Only Dir[] (= Dir.glob) works.
    # Short and long path name is specific to Windows filesystem.
    if win_platform?
      @tempdir = Dir[@tempdir][0]
      @tempdir.untaint
    end

    @gemhome  = File.join @tempdir, 'gemhome'
    @userhome = File.join @tempdir, 'userhome'
    ENV["GEM_SPEC_CACHE"] = File.join @tempdir, 'spec_cache'

    @orig_ruby = if ENV['RUBY'] then
                   ruby = Gem.ruby
                   Gem.ruby = ENV['RUBY']
                   ruby
                 end

    @git = ENV['GIT'] || 'git'

    Gem.ensure_gem_subdirectories @gemhome

    @orig_LOAD_PATH = $LOAD_PATH.dup
    $LOAD_PATH.map! { |s|
      (expand_path = File.expand_path(s)) == s ? s : expand_path.untaint
    }

    Dir.chdir @tempdir

    @orig_ENV_HOME = ENV['HOME']
    ENV['HOME'] = @userhome
    Gem.instance_variable_set :@user_home, nil
    Gem.instance_variable_set :@gemdeps, nil
    Gem.instance_variable_set :@env_requirements_by_name, nil
    Gem.send :remove_instance_variable, :@ruby_version if
      Gem.instance_variables.include? :@ruby_version

    FileUtils.mkdir_p @gemhome
    FileUtils.mkdir_p @userhome

    @orig_gem_private_key_passphrase = ENV['GEM_PRIVATE_KEY_PASSPHRASE']
    ENV['GEM_PRIVATE_KEY_PASSPHRASE'] = PRIVATE_KEY_PASSPHRASE

    @default_dir = File.join @tempdir, 'default'
    @default_spec_dir = File.join @default_dir, "specifications", "default"
    Gem.instance_variable_set :@default_dir, @default_dir
    FileUtils.mkdir_p @default_spec_dir

    # We use Gem::Specification.reset the first time only so that if there
    # are unresolved deps that leak into the whole test suite, they're at least
    # reported once.
    if @@initial_reset
      Gem::Specification.unresolved_deps.clear # done to avoid cross-test warnings
    else
      @@initial_reset = true
      Gem::Specification.reset
    end
    Gem.use_paths(@gemhome)

    Gem::Security.reset

    Gem.loaded_specs.clear
    Gem.clear_default_specs
    Gem::Specification.unresolved_deps.clear
    if Gem::USE_BUNDLER_FOR_GEMDEPS
      Bundler.reset!
    end

    Gem.configuration.verbose = true
    Gem.configuration.update_sources = true

    Gem::RemoteFetcher.fetcher = Gem::FakeFetcher.new

    @gem_repo = "http://gems.example.com/"
    @uri = URI.parse @gem_repo
    Gem.sources.replace [@gem_repo]

    Gem.searcher = nil
    Gem::SpecFetcher.fetcher = nil
    @orig_BASERUBY = RbConfig::CONFIG['BASERUBY']
    RbConfig::CONFIG['BASERUBY'] = RbConfig::CONFIG['ruby_install_name']

    @orig_arch = RbConfig::CONFIG['arch']

    if win_platform?
      util_set_arch 'i386-mswin32'
    else
      util_set_arch 'i686-darwin8.10.1'
    end

    @marshal_version = "#{Marshal::MAJOR_VERSION}.#{Marshal::MINOR_VERSION}"
    @orig_LOADED_FEATURES = $LOADED_FEATURES.dup
  end