Class: Gem::TestCase

# File 'lib/rubygems/test_case.rb', line 1083

def self.win_platform?
  Gem.win_platform?
end

# File 'lib/rubygems/test_case.rb', line 1411

def self.key_path key_name
  File.expand_path "../../../test/rubygems/#{key_name}_key.pem", __FILE__
end

# File 'lib/rubygems/test_case.rb', line 1373

def self.load_cert cert_name
  cert_file = cert_path cert_name

  cert = File.read cert_file

  OpenSSL::X509::Certificate.new cert
end

# File 'lib/rubygems/test_case.rb', line 1400

def self.load_key key_name, passphrase = nil
  key_file = key_path key_name

  key = File.read key_file

  OpenSSL::PKey::RSA.new key, passphrase
end

# File 'lib/rubygems/test_case.rb', line 1115

def self.make_command
  ENV["make"] || (vc_windows? ? 'nmake' : 'make')
end

# File 'lib/rubygems/test_case.rb', line 1148

def self.process_based_port
  @@process_based_port ||= 8000 + $$ % 1000
end

# File 'lib/rubygems/test_case.rb', line 1181

def self.rubybin
  ruby = ENV["RUBY"]
  return ruby if ruby
  ruby = "ruby"
  rubyexe = "#{ruby}.exe"

  3.times do
    if File.exist? ruby and File.executable? ruby and !File.directory? ruby
      return File.expand_path(ruby)
    end
    if File.exist? rubyexe and File.executable? rubyexe
      return File.expand_path(rubyexe)
    end
    ruby = File.join("..", ruby)
  end

  begin
    require "rbconfig"
    File.join(RbConfig::CONFIG["bindir"],
              RbConfig::CONFIG["ruby_install_name"] +
              RbConfig::CONFIG["EXEEXT"])
  rescue LoadError
    "ruby"
  end
end

# File 'lib/rubygems/test_case.rb', line 1131

def nmake_found?
  system('nmake /? 1>NUL 2>&1')
end

# File 'lib/rubygems/test_case.rb', line 1106

def vc_windows?
  RUBY_PLATFORM.match('mswin')
end

# File 'lib/rubygems/test_case.rb', line 1090

def win_platform?
  Gem.win_platform?
end

# File 'lib/rubygems/test_case.rb', line 568

def all_spec_names
  Gem::Specification.map(&:full_name)
end

# File 'lib/rubygems/test_case.rb', line 95

def assert_activate expected, *specs
  specs.each do |spec|
    case spec
    when String then
      Gem::Specification.find_by_name(spec).activate
    when Gem::Specification then
      spec.activate
    else
      flunk spec.inspect
    end
  end

  loaded = Gem.loaded_specs.values.map(&:full_name)

  assert_equal expected.sort, loaded.sort if expected
end

# File 'lib/rubygems/test_case.rb', line 169

def assert_contains_make_command(target, output, msg = nil)
  if output.match(/\n/)
    msg = message(msg) {
      'Expected output containing make command "%s": %s' % [
        ('%s %s' % [make_command, target]).rstrip,
        output.inspect
      ]
    }
  else
    msg = message(msg) {
      'Expected make command "%s": %s' % [
        ('%s %s' % [make_command, target]).rstrip,
        output.inspect
      ]
    }
  end

  assert scan_make_command_lines(output).any? { |line|
    make = parse_make_command_line(line)

    if make[:targets].include?(target)
      yield make, line if block_given?
      true
    else
      false
    end
  }, msg
end

# File 'lib/rubygems/test_case.rb', line 113

def assert_path_exists path, msg = nil
  msg = message(msg) { "Expected path '#{path}' to exist" }
  assert File.exist?(path), msg
end

# File 'lib/rubygems/test_case.rb', line 1162

def build_rake_in(good=true)
  gem_ruby = Gem.ruby
  Gem.ruby = @@ruby
  env_rake = ENV["rake"]
  rake = (good ? @@good_rake : @@bad_rake)
  ENV["rake"] = rake
  yield rake
ensure
  Gem.ruby = gem_ruby
  if env_rake
    ENV["rake"] = env_rake
  else
    ENV.delete("rake")
  end
end

# File 'lib/rubygems/test_case.rb', line 383

def common_installer_setup
  common_installer_teardown

  Gem.post_build do |installer|
    @post_build_hook_arg = installer
    true
  end

  Gem.post_install do |installer|
    @post_install_hook_arg = installer
  end

  Gem.post_uninstall do |uninstaller|
    @post_uninstall_hook_arg = uninstaller
  end

  Gem.pre_install do |installer|
    @pre_install_hook_arg = installer
    true
  end

  Gem.pre_uninstall do |uninstaller|
    @pre_uninstall_hook_arg = uninstaller
  end
end

# File 'lib/rubygems/test_case.rb', line 409

def common_installer_teardown
  Gem.post_build_hooks.clear
  Gem.post_install_hooks.clear
  Gem.done_installing_hooks.clear
  Gem.post_reset_hooks.clear
  Gem.post_uninstall_hooks.clear
  Gem.pre_install_hooks.clear
  Gem.pre_reset_hooks.clear
  Gem.pre_uninstall_hooks.clear
end

# File 'lib/rubygems/test_case.rb', line 519

def create_tmpdir
  tmpdir = nil
  Dir.chdir Dir.tmpdir do tmpdir = Dir.pwd end # HACK OSX /private/tmp
  tmpdir = File.join tmpdir, "test_rubygems_#{$$}"
  FileUtils.mkdir_p tmpdir
  return tmpdir
end

# File 'lib/rubygems/test_case.rb', line 1214

def dep name, *requirements
  Gem::Dependency.new name, *requirements
end

# File 'lib/rubygems/test_case.rb', line 1223

def dependency_request dep, from_name, from_version, parent = nil
  remote = Gem::Source.new @uri

  unless parent then
    parent_dep = dep from_name, from_version
    parent = Gem::Resolver::DependencyRequest.new parent_dep, nil
  end

  spec = Gem::Resolver::IndexSpecification.new \
    nil, from_name, from_version, remote, Gem::Platform::RUBY
  activation = Gem::Resolver::ActivationRequest.new spec, parent

  Gem::Resolver::DependencyRequest.new dep, activation
end

# File 'lib/rubygems/test_case.rb', line 122

def enable_shared value
  enable_shared = RbConfig::CONFIG['ENABLE_SHARED']
  RbConfig::CONFIG['ENABLE_SHARED'] = value

  yield
ensure
  if enable_shared then
    RbConfig::CONFIG['enable_shared'] = enable_shared
  else
    RbConfig::CONFIG.delete 'enable_shared'
  end
end

# File 'lib/rubygems/test_case.rb', line 426

def git_gem name = 'a', version = 1
  have_git?

  directory = File.join 'git', name
  directory = File.expand_path directory

  git_spec = Gem::Specification.new name, version do |specification|
    yield specification if block_given?
  end

  FileUtils.mkdir_p directory

  gemspec = "#{name}.gemspec"

  open File.join(directory, gemspec), 'w' do |io|
    io.write git_spec.to_ruby
  end

  head = nil

  Dir.chdir directory do
    unless File.exist? '.git' then
      system @git, 'init', '--quiet'
      system @git, 'config', 'user.name',  'RubyGems Tests'
      system @git, 'config', 'user.email', 'rubygems@example'
    end

    system @git, 'add', gemspec
    system @git, 'commit', '-a', '-m', 'a non-empty commit message', '--quiet'
    head = Gem::Util.popen('git', 'rev-parse', 'master').strip
  end

  return name, git_spec.version, directory, head
end

# File 'lib/rubygems/test_case.rb', line 669

def install_default_gems(*specs)
  install_default_specs(*specs)

  specs.each do |spec|
    open spec.loaded_from, 'w' do |io|
      io.write spec.to_ruby_for_cache
    end
  end
end

# File 'lib/rubygems/test_case.rb', line 682

def install_default_specs(*specs)
  install_specs(*specs)
  specs.each do |spec|
    Gem.register_default_spec(spec)
  end
end

# File 'lib/rubygems/test_case.rb', line 481

def install_gem spec, options = {}
  require 'rubygems/installer'

  gem = File.join @tempdir, "gems", "#{spec.full_name}.gem"

  unless File.exist? gem then
    use_ui Gem::MockGemUi.new do
      Dir.chdir @tempdir do
        Gem::Package.build spec
      end
    end

    gem = File.join(@tempdir, File.basename(spec.cache_file)).untaint
  end

  Gem::Installer.new(gem, options.merge({:wrappers => true})).install
end

# File 'lib/rubygems/test_case.rb', line 502

def install_gem_user spec
  install_gem spec, :user_install => true
end

# File 'lib/rubygems/test_case.rb', line 661

def install_specs(*specs)
  Gem::Specification.add_specs(*specs)
  Gem.searcher = nil
end

# File 'lib/rubygems/test_case.rb', line 689

def loaded_spec_names
  Gem.loaded_specs.values.map(&:full_name).sort
end

# File 'lib/rubygems/test_case.rb', line 1124

def make_command
  ENV["make"] || (vc_windows? ? 'nmake' : 'make')
end

# File 'lib/rubygems/test_case.rb', line 530

def mu_pp(obj)
  s = ''
  s = PP.pp obj, s
  s = s.force_encoding(Encoding.default_external) if defined? Encoding
  s.chomp
end

# File 'lib/rubygems/test_case.rb', line 749

def new_default_spec(name, version, deps = nil, *files)
  spec = util_spec name, version, deps

  spec.loaded_from = File.join(@default_spec_dir, spec.spec_name)
  spec.files = files

  lib_dir = File.join(@tempdir, "default_gems", "lib")
  $LOAD_PATH.unshift(lib_dir)
  files.each do |file|
    rb_path = File.join(lib_dir, file)
    FileUtils.mkdir_p(File.dirname(rb_path))
    File.open(rb_path, "w") do |rb|
      rb << "# #{file}"
    end
  end

  spec
end

# File 'lib/rubygems/test_case.rb', line 145

def parse_make_command_line(line)
  command, *args = line.shellsplit

  targets = []
  macros = {}

  args.each do |arg|
    case arg
    when /\A(\w+)=/
      macros[$1] = $'
    else
      targets << arg
    end
  end

  targets << '' if targets.empty?

  {
    :command => command,
    :targets => targets,
    :macros => macros,
  }
end

# File 'lib/rubygems/test_case.rb', line 1155

def process_based_port
  self.class.process_based_port
end

# File 'lib/rubygems/test_case.rb', line 582

def quick_gem(name, version='2')
  require 'rubygems/specification'

  spec = Gem::Specification.new do |s|
    s.platform    = Gem::Platform::RUBY
    s.name        = name
    s.version     = version
    s.author      = 'A User'
    s.email       = 'example@example.com'
    s.homepage    = 'http://example.com'
    s.summary     = "this is a summary"
    s.description = "This is a test description"

    yield(s) if block_given?
  end

  Gem::Specification.map # HACK: force specs to (re-)load before we write

  written_path = write_file spec.spec_file do |io|
    io.write spec.to_ruby_for_cache
  end

  spec.loaded_from = spec.loaded_from = written_path

  Gem::Specification.add_spec spec.for_cache

  return spec
end

# File 'lib/rubygems/test_case.rb', line 549

def read_binary(path)
  Gem.read_binary path
end

# File 'lib/rubygems/test_case.rb', line 540

def read_cache(path)
  open path.dup.untaint, 'rb' do |io|
    Marshal.load io.read
  end
end

# File 'lib/rubygems/test_case.rb', line 136

def refute_path_exists path, msg = nil
  msg = message(msg) { "Expected path '#{path}' to not exist" }
  refute File.exist?(path), msg
end

# File 'lib/rubygems/test_case.rb', line 1241

def req *requirements
  return requirements.first if Gem::Requirement === requirements.first
  Gem::Requirement.create requirements
end

# File 'lib/rubygems/test_case.rb', line 697

def save_loaded_features
  old_loaded_features = $LOADED_FEATURES.dup
  yield
ensure
  $LOADED_FEATURES.replace old_loaded_features
end

# File 'lib/rubygems/test_case.rb', line 141

def scan_make_command_lines(output)
  output.scan(/^#{Regexp.escape make_command}(?:[[:blank:]].*)?$/)
end

# File 'lib/rubygems/test_case.rb', line 218

def setup
  super

  @orig_gem_home   = ENV['GEM_HOME']
  @orig_gem_path   = ENV['GEM_PATH']
  @orig_gem_vendor = ENV['GEM_VENDOR']

  ENV['GEM_VENDOR'] = nil

  @current_dir = Dir.pwd
  @fetcher     = nil
  @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| File.expand_path(s).untaint }

  Dir.chdir @tempdir

  @orig_ENV_HOME = ENV['HOME']
  ENV['HOME'] = @userhome
  Gem.instance_variable_set :@user_home, 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

  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}"
end

# File 'lib/rubygems/test_case.rb', line 1249

def spec name, version, &block
  Gem::Specification.new name, v(version), &block
end

# File 'lib/rubygems/test_case.rb', line 1273

def spec_fetcher repository = @gem_repo
  Gem::TestCase::SpecFetcherSetup.declare self, repository do |spec_fetcher_setup|
    yield spec_fetcher_setup if block_given?
  end
end

# File 'lib/rubygems/test_case.rb', line 346

def teardown
  $LOAD_PATH.replace @orig_LOAD_PATH if @orig_LOAD_PATH

  if @orig_BASERUBY
    RbConfig::CONFIG['BASERUBY'] = @orig_BASERUBY
  else
    RbConfig::CONFIG.delete('BASERUBY')
  end
  RbConfig::CONFIG['arch'] = @orig_arch

  if defined? Gem::RemoteFetcher then
    Gem::RemoteFetcher.fetcher = nil
  end

  Dir.chdir @current_dir

  FileUtils.rm_rf @tempdir unless ENV['KEEP_FILES']

  ENV['GEM_HOME']   = @orig_gem_home
  ENV['GEM_PATH']   = @orig_gem_path
  ENV['GEM_VENDOR'] = @orig_gem_vendor

  Gem.ruby = @orig_ruby if @orig_ruby

  if @orig_ENV_HOME then
    ENV['HOME'] = @orig_ENV_HOME
  else
    ENV.delete 'HOME'
  end

  Gem.instance_variable_set :@default_dir, nil

  ENV['GEM_PRIVATE_KEY_PASSPHRASE'] = @orig_gem_private_key_passphrase

  Gem::Specification._clear_load_cache
end

# File 'lib/rubygems/test_case.rb', line 508

def uninstall_gem spec
  require 'rubygems/uninstaller'

  Gem::Uninstaller.new(spec.name,
                       :executables => true, :user_install => true).uninstall
end

# File 'lib/rubygems/test_case.rb', line 693

def unresolved_names
  Gem::Specification.unresolved_deps.values.map(&:to_s).sort
end

# File 'lib/rubygems/test_case.rb', line 622

def util_build_gem(spec)
  dir = spec.gem_dir
  FileUtils.mkdir_p dir

  Dir.chdir dir do
    spec.files.each do |file|
      next if File.exist? file
      FileUtils.mkdir_p File.dirname(file)
      File.open file, 'w' do |fp| fp.puts "# #{file}" end
    end

    use_ui Gem::MockGemUi.new do
      Gem::Package.build spec
    end

    cache = spec.cache_file
    FileUtils.mv File.basename(cache), cache
  end
end

# File 'lib/rubygems/test_case.rb', line 650

def util_clear_gems
  FileUtils.rm_rf File.join(@gemhome, "gems") # TODO: use Gem::Dirs
  FileUtils.mkdir File.join(@gemhome, "gems")
  FileUtils.rm_rf File.join(@gemhome, "specifications")
  FileUtils.mkdir File.join(@gemhome, "specifications")
  Gem::Specification.reset
end

# File 'lib/rubygems/test_case.rb', line 809

def util_gem(name, version, deps = nil, &block)
  # TODO: deprecate
  raise "deps or block, not both" if deps and block

  if deps then
    block = proc do |s|
      # Since Hash#each is unordered in 1.8, sort
      # the keys and iterate that way so the tests are
      # deterministic on all implementations.
      deps.keys.sort.each do |n|
        s.add_dependency n, (deps[n] || '>= 0')
      end
    end
  end

  spec = quick_gem(name, version, &block)

  util_build_gem spec

  cache_file = File.join @tempdir, 'gems', "#{spec.original_name}.gem"
  FileUtils.mkdir_p File.dirname cache_file
  FileUtils.mv spec.cache_file, cache_file
  FileUtils.rm spec.spec_file

  spec.loaded_from = nil

  [spec, cache_file]
end

# File 'lib/rubygems/test_case.rb', line 841

def util_gzip(data)
  out = StringIO.new

  Zlib::GzipWriter.wrap out do |io|
    io.write data
  end

  out.string
end

# File 'lib/rubygems/test_case.rb', line 869

def util_make_gems(prerelease = false)
  @a1 = quick_gem 'a', '1' do |s|
    s.files = %w[lib/code.rb]
    s.require_paths = %w[lib]
    s.date = Gem::Specification::TODAY - 86400
    s.homepage = 'http://a.example.com'
    s.email = %w[example@example.com example2@example.com]
    s.authors = %w[Example Example2]
    s.description = <<-DESC
This line is really, really long.  So long, in fact, that it is more than eighty characters long!  The purpose of this line is for testing wrapping behavior because sometimes people don't wrap their text to eighty characters.  Without the wrapping, the text might not look good in the RSS feed.

Also, a list:
* An entry that\'s actually kind of sort
* an entry that\'s really long, which will probably get wrapped funny.  That's ok, somebody wasn't thinking straight when they made it more than eighty characters.
    DESC
  end

  init = proc do |s|
    s.files = %w[lib/code.rb]
    s.require_paths = %w[lib]
  end

  @a2      = quick_gem('a', '2',      &init)
  @a3a     = quick_gem('a', '3.a',    &init)
  @a_evil9 = quick_gem('a_evil', '9', &init)
  @b2      = quick_gem('b', '2',      &init)
  @c1_2    = quick_gem('c', '1.2',    &init)
  @x       = quick_gem('x', '1',      &init)
  @dep_x   = quick_gem('dep_x', '1') do |s|
    s.files = %w[lib/code.rb]
    s.require_paths = %w[lib]
    s.add_dependency 'x', '>= 1'
  end

  @pl1     = quick_gem 'pl', '1' do |s| # l for legacy
    s.files = %w[lib/code.rb]
    s.require_paths = %w[lib]
    s.platform = Gem::Platform.new 'i386-linux'
    s.instance_variable_set :@original_platform, 'i386-linux'
  end

  if prerelease
    @a2_pre = quick_gem('a', '2.a', &init)
    write_file File.join(*%W[gems #{@a2_pre.original_name} lib code.rb])
    util_build_gem @a2_pre
  end

  write_file File.join(*%W[gems #{@a1.original_name}      lib code.rb])
  write_file File.join(*%W[gems #{@a2.original_name}      lib code.rb])
  write_file File.join(*%W[gems #{@a3a.original_name}     lib code.rb])
  write_file File.join(*%W[gems #{@a_evil9.original_name} lib code.rb])
  write_file File.join(*%W[gems #{@b2.original_name}      lib code.rb])
  write_file File.join(*%W[gems #{@c1_2.original_name}    lib code.rb])
  write_file File.join(*%W[gems #{@pl1.original_name}     lib code.rb])
  write_file File.join(*%W[gems #{@x.original_name}       lib code.rb])
  write_file File.join(*%W[gems #{@dep_x.original_name}   lib code.rb])

  [@a1, @a2, @a3a, @a_evil9, @b2, @c1_2, @pl1, @x, @dep_x].each do |spec|
    util_build_gem spec
  end

  FileUtils.rm_r File.join(@gemhome, "gems", @pl1.original_name)
end

# File 'lib/rubygems/test_case.rb', line 642

def util_remove_gem(spec)
  FileUtils.rm_rf spec.cache_file
  FileUtils.rm_rf spec.spec_file
end

# File 'lib/rubygems/test_case.rb', line 1068

def util_restore_RUBY_VERSION
  Object.send :remove_const, :RUBY_VERSION
  Object.send :remove_const, :RUBY_PATCHLEVEL if defined?(RUBY_PATCHLEVEL)
  Object.send :remove_const, :RUBY_REVISION   if defined?(RUBY_REVISION)

  Object.const_set :RUBY_VERSION,    @RUBY_VERSION
  Object.const_set :RUBY_PATCHLEVEL, @RUBY_PATCHLEVEL if
    defined?(@RUBY_PATCHLEVEL)
  Object.const_set :RUBY_REVISION,   @RUBY_REVISION   if
    defined?(@RUBY_REVISION)
end

# File 'lib/rubygems/test_case.rb', line 936

def util_set_arch(arch)
  RbConfig::CONFIG['arch'] = arch
  platform = Gem::Platform.new arch

  Gem.instance_variable_set :@platforms, nil
  Gem::Platform.instance_variable_set :@local, nil

  platform
end

# File 'lib/rubygems/test_case.rb', line 1049

def util_set_RUBY_VERSION(version, patchlevel = nil, revision = nil)
  if Gem.instance_variables.include? :@ruby_version or
     Gem.instance_variables.include? '@ruby_version' then
    Gem.send :remove_instance_variable, :@ruby_version
  end

  @RUBY_VERSION    = RUBY_VERSION
  @RUBY_PATCHLEVEL = RUBY_PATCHLEVEL if defined?(RUBY_PATCHLEVEL)
  @RUBY_REVISION   = RUBY_REVISION   if defined?(RUBY_REVISION)

  Object.send :remove_const, :RUBY_VERSION
  Object.send :remove_const, :RUBY_PATCHLEVEL if defined?(RUBY_PATCHLEVEL)
  Object.send :remove_const, :RUBY_REVISION   if defined?(RUBY_REVISION)

  Object.const_set :RUBY_VERSION,    version
  Object.const_set :RUBY_PATCHLEVEL, patchlevel if patchlevel
  Object.const_set :RUBY_REVISION,   revision   if revision
end

# File 'lib/rubygems/test_case.rb', line 952

def util_setup_fake_fetcher(prerelease = false)
  require 'zlib'
  require 'socket'
  require 'rubygems/remote_fetcher'

  @fetcher = Gem::FakeFetcher.new

  util_make_gems(prerelease)
  Gem::Specification.reset

  @all_gems = [@a1, @a2, @a3a, @a_evil9, @b2, @c1_2].sort
  @all_gem_names = @all_gems.map { |gem| gem.full_name }

  gem_names = [@a1.full_name, @a2.full_name, @a3a.full_name, @b2.full_name]
  @gem_names = gem_names.sort.join("\n")

  Gem::RemoteFetcher.fetcher = @fetcher
end

# File 'lib/rubygems/test_case.rb', line 984

def util_setup_spec_fetcher(*specs)
  specs -= Gem::Specification._all
  Gem::Specification.add_specs(*specs)

  spec_fetcher = Gem::SpecFetcher.fetcher

  prerelease, all = Gem::Specification.partition { |spec|
    spec.version.prerelease?
  }

  spec_fetcher.specs[@uri] = []
  all.each do |spec|
    spec_fetcher.specs[@uri] << spec.name_tuple
  end

  spec_fetcher.latest_specs[@uri] = []
  Gem::Specification.latest_specs.each do |spec|
    spec_fetcher.latest_specs[@uri] << spec.name_tuple
  end

  spec_fetcher.prerelease_specs[@uri] = []
  prerelease.each do |spec|
    spec_fetcher.prerelease_specs[@uri] << spec.name_tuple
  end

  # HACK for test_download_to_cache
  unless Gem::RemoteFetcher === @fetcher then
    v = Gem.marshal_version

    specs = all.map { |spec| spec.name_tuple }
    s_zip = util_gzip Marshal.dump Gem::NameTuple.to_basic specs

    latest_specs = Gem::Specification.latest_specs.map do |spec|
      spec.name_tuple
    end

    l_zip = util_gzip Marshal.dump Gem::NameTuple.to_basic latest_specs

    prerelease_specs = prerelease.map { |spec| spec.name_tuple }
    p_zip = util_gzip Marshal.dump Gem::NameTuple.to_basic prerelease_specs

    @fetcher.data["#{@gem_repo}specs.#{v}.gz"]            = s_zip
    @fetcher.data["#{@gem_repo}latest_specs.#{v}.gz"]     = l_zip
    @fetcher.data["#{@gem_repo}prerelease_specs.#{v}.gz"] = p_zip

    v = Gem.marshal_version

    Gem::Specification.each do |spec|
      path = "#{@gem_repo}quick/Marshal.#{v}/#{spec.original_name}.gemspec.rz"
      data = Marshal.dump spec
      data_deflate = Zlib::Deflate.deflate data
      @fetcher.data[path] = data_deflate
    end
  end

  nil # force errors
end

# File 'lib/rubygems/test_case.rb', line 772

def util_spec name, version = 2, deps = nil # :yields: specification
  raise "deps or block, not both" if deps and block_given?

  spec = Gem::Specification.new do |s|
    s.platform    = Gem::Platform::RUBY
    s.name        = name
    s.version     = version
    s.author      = 'A User'
    s.email       = 'example@example.com'
    s.homepage    = 'http://example.com'
    s.summary     = "this is a summary"
    s.description = "This is a test description"

    yield s if block_given?
  end

  if deps then
    # Since Hash#each is unordered in 1.8, sort the keys and iterate that
    # way so the tests are deterministic on all implementations.
    deps.keys.sort.each do |n|
      spec.add_dependency n, (deps[n] || '>= 0')
    end
  end

  spec.loaded_from = spec.spec_file

  Gem::Specification.add_spec spec

  return spec
end

# File 'lib/rubygems/test_case.rb', line 1045

def util_zip(data)
  Zlib::Deflate.deflate data
end

# File 'lib/rubygems/test_case.rb', line 1282

def v string
  Gem::Version.create string
end

# File 'lib/rubygems/test_case.rb', line 1292

def vendor_gem name = 'a', version = 1
  directory = File.join 'vendor', name

  vendor_spec = Gem::Specification.new name, version do |specification|
    yield specification if block_given?
  end

  FileUtils.mkdir_p directory

  open File.join(directory, "#{name}.gemspec"), 'w' do |io|
    io.write vendor_spec.to_ruby
  end

  return name, vendor_spec.version, directory
end

# File 'lib/rubygems/test_case.rb', line 1138

def wait_for_child_process_to_exit
  Process.wait if Process.respond_to?(:fork)
rescue Errno::ECHILD
end

# File 'lib/rubygems/test_case.rb', line 556

def write_file(path)
  path = File.join @gemhome, path unless Pathname.new(path).absolute?
  dir = File.dirname path
  FileUtils.mkdir_p dir

  open path, 'wb' do |io|
    yield io if block_given?
  end

  path
end