require "test/unit"
require "fileutils"
require "tmpdir"

class TestFileExhaustive < Test::Unit::TestCase
  def setup
    @dir = Dir.mktmpdir("rubytest-file")
    File.chown(-1, Process.gid, @dir)
    @file = make_tmp_filename("file")
    @zerofile = make_tmp_filename("zerofile")
    @nofile = make_tmp_filename("nofile")
    @symlinkfile = make_tmp_filename("symlinkfile")
    @hardlinkfile = make_tmp_filename("hardlinkfile")
    make_file("foo", @file)
    make_file("", @zerofile)
    @time = Time.now
    begin
      File.symlink(@file, @symlinkfile)
    rescue NotImplementedError
      @symlinkfile = nil
    end
    begin
      File.link(@file, @hardlinkfile)
    rescue NotImplementedError, Errno::EINVAL	# EINVAL for Windows Vista
      @hardlinkfile = nil
    end
  end

  def teardown
    GC.start
    FileUtils.remove_entry_secure @dir
  end

  def make_file(content, file = @file)
    open(file, "w") {|fh| fh << content }
  end
  
  def make_tmp_filename(prefix)
    @hardlinkfile = @dir + "/" + prefix + File.basename(__FILE__) + ".#{$$}.test"
  end

  def test_path
    file = @file

    assert_equal(file, File.new(file).path)
    assert_equal(file, File.path(file))
    o = Object.new
    class << o; self; end.class_eval do
      define_method(:to_path) { file }
    end
    assert_equal(file, File.path(o))
  end

  def assert_integer(n)
    assert(n.is_a?(Integer), n.inspect + " is not Fixnum.")
  end

  def assert_integer_or_nil(n)
    assert(n.is_a?(Integer) || n.equal?(nil), n.inspect + " is neither Fixnum nor nil.")
  end

  def test_stat
    sleep(@time - Time.now + 1.1)
    make_file("foo", @file + "2")
    fs1, fs2 = File.stat(@file), File.stat(@file + "2")
    assert_nothing_raised do
      assert_equal(0, fs1 <=> fs1)
      assert_equal(-1, fs1 <=> fs2)
      assert_equal(1, fs2 <=> fs1)
      assert_nil(fs1 <=> nil)
      assert_integer(fs1.dev)
      assert_integer_or_nil(fs1.rdev)
      assert_integer_or_nil(fs1.dev_major)
      assert_integer_or_nil(fs1.dev_minor)
      assert_integer_or_nil(fs1.rdev_major)
      assert_integer_or_nil(fs1.rdev_minor)
      assert_integer(fs1.ino)
      assert_integer(fs1.mode)
      unless /emx/ =~ RUBY_PLATFORM
        assert_equal(@hardlinkfile ? 2 : 1, fs1.nlink)
      end
      assert_integer(fs1.uid)
      assert_integer(fs1.gid)
      assert_equal(3, fs1.size)
      assert_integer_or_nil(fs1.blksize)
      assert_integer_or_nil(fs1.blocks)
      assert_kind_of(Time, fs1.atime)
      assert_kind_of(Time, fs1.mtime)
      assert_kind_of(Time, fs1.ctime)
      assert_kind_of(String, fs1.inspect)
    end
    assert_raise(Errno::ENOENT) { File.stat(@nofile) }
    assert_kind_of(File::Stat, File.new(@file).stat)
    assert_raise(Errno::ENOENT) { File.lstat(@nofile) }
    assert_kind_of(File::Stat, File.new(@file).lstat)
  end

  def test_directory_p
    assert(File.directory?(@dir))
    assert(!(File.directory?(@dir+"/...")))
    assert(!(File.directory?(@file)))
    assert(!(File.directory?(@nofile)))
  end

  def test_pipe_p ## xxx
    assert(!(File.pipe?(@dir)))
    assert(!(File.pipe?(@file)))
    assert(!(File.pipe?(@nofile)))
  end

  def test_symlink_p
    assert(!(File.symlink?(@dir)))
    assert(!(File.symlink?(@file)))
    assert(File.symlink?(@symlinkfile)) if @symlinkfile
    assert(!(File.symlink?(@hardlinkfile))) if @hardlinkfile
    assert(!(File.symlink?(@nofile)))
  end

  def test_socket_p ## xxx
    assert(!(File.socket?(@dir)))
    assert(!(File.socket?(@file)))
    assert(!(File.socket?(@nofile)))
  end

  def test_blockdev_p ## xxx
    assert(!(File.blockdev?(@dir)))
    assert(!(File.blockdev?(@file)))
    assert(!(File.blockdev?(@nofile)))
  end

  def test_chardev_p ## xxx
    assert(!(File.chardev?(@dir)))
    assert(!(File.chardev?(@file)))
    assert(!(File.chardev?(@nofile)))
  end

  def test_exist_p
    assert(File.exist?(@dir))
    assert(File.exist?(@file))
    assert(!(File.exist?(@nofile)))
  end

  def test_readable_p
    return if /cygwin|mswin|bccwin|mingw|emx/ =~ RUBY_PLATFORM
    File.chmod(0200, @file)
    assert(!(File.readable?(@file)))
    File.chmod(0600, @file)
    assert(File.readable?(@file))
    assert(!(File.readable?(@nofile)))
  end

  def test_readable_real_p
    return if /cygwin|mswin|bccwin|mingw|emx/ =~ RUBY_PLATFORM
    File.chmod(0200, @file)
    assert(!(File.readable_real?(@file)))
    File.chmod(0600, @file)
    assert(File.readable_real?(@file))
    assert(!(File.readable_real?(@nofile)))
  end

  def test_world_readable_p
    return if /cygwin|mswin|bccwin|mingw|emx/ =~ RUBY_PLATFORM
    File.chmod(0006, @file)
    assert(File.world_readable?(@file))
    File.chmod(0060, @file)
    assert(!(File.world_readable?(@file)))
    File.chmod(0600, @file)
    assert(!(File.world_readable?(@file)))
    assert(!(File.world_readable?(@nofile)))
  end

  def test_writable_p
    return if /cygwin|mswin|bccwin|mingw|emx/ =~ RUBY_PLATFORM
    File.chmod(0400, @file)
    assert(!(File.writable?(@file)))
    File.chmod(0600, @file)
    assert(File.writable?(@file))
    assert(!(File.writable?(@nofile)))
  end

  def test_writable_real_p
    return if /cygwin|mswin|bccwin|mingw|emx/ =~ RUBY_PLATFORM
    File.chmod(0400, @file)
    assert(!(File.writable_real?(@file)))
    File.chmod(0600, @file)
    assert(File.writable_real?(@file))
    assert(!(File.writable_real?(@nofile)))
  end

  def test_world_writable_p
    return if /cygwin|mswin|bccwin|mingw|emx/ =~ RUBY_PLATFORM
    File.chmod(0006, @file)
    assert(File.world_writable?(@file))
    File.chmod(0060, @file)
    assert(!(File.world_writable?(@file)))
    File.chmod(0600, @file)
    assert(!(File.world_writable?(@file)))
    assert(!(File.world_writable?(@nofile)))
  end

  def test_executable_p
    return if /cygwin|mswin|bccwin|mingw|emx/ =~ RUBY_PLATFORM
    File.chmod(0100, @file)
    assert(File.executable?(@file))
    File.chmod(0600, @file)
    assert(!(File.executable?(@file)))
    assert(!(File.executable?(@nofile)))
  end

  def test_executable_real_p
    return if /cygwin|mswin|bccwin|mingw|emx/ =~ RUBY_PLATFORM
    File.chmod(0100, @file)
    assert(File.executable_real?(@file))
    File.chmod(0600, @file)
    assert(!(File.executable_real?(@file)))
    assert(!(File.executable_real?(@nofile)))
  end

  def test_file_p
    assert(!(File.file?(@dir)))
    assert(File.file?(@file))
    assert(!(File.file?(@nofile)))
  end

  def test_zero_p
    assert_nothing_raised { File.zero?(@dir) }
    assert(!(File.zero?(@file)))
    assert(File.zero?(@zerofile))
    assert(!(File.zero?(@nofile)))
  end

  def test_size_p
    assert_nothing_raised { File.size?(@dir) }
    assert_equal(3, File.size?(@file))
    assert(!(File.size?(@zerofile)))
    assert(!(File.size?(@nofile)))
  end

  def test_owned_p ## xxx
    return if /cygwin|mswin|bccwin|mingw|emx/ =~ RUBY_PLATFORM
    assert(File.owned?(@file))
    assert(File.grpowned?(@file))
  end

  def test_suid_sgid_sticky ## xxx
    assert(!(File.setuid?(@file)))
    assert(!(File.setgid?(@file)))
    assert(!(File.sticky?(@file)))
  end

  def test_identical_p
    assert(File.identical?(@file, @file))
    assert(!(File.identical?(@file, @zerofile)))
    assert(!(File.identical?(@file, @nofile)))
    assert(!(File.identical?(@nofile, @file)))
  end

  def test_size
    assert_integer(File.size(@dir))
    assert_equal(3, File.size(@file))
    assert_equal(0, File.size(@zerofile))
    assert_raise(Errno::ENOENT) { File.size(@nofile) }
  end

  def test_ftype
    assert_equal("directory", File.ftype(@dir))
    assert_equal("file", File.ftype(@file))
    assert_equal("link", File.ftype(@symlinkfile)) if @symlinkfile
    assert_equal("file", File.ftype(@hardlinkfile)) if @hardlinkfile
    assert_raise(Errno::ENOENT) { File.ftype(@nofile) }
  end

  def test_atime
    t1 = File.atime(@file)
    t2 = File.new(@file).atime
    assert_kind_of(Time, t1)
    assert_kind_of(Time, t2)
    assert_equal(t1, t2)
    assert_raise(Errno::ENOENT) { File.atime(@nofile) }
  end

  def test_mtime
    t1 = File.mtime(@file)
    t2 = File.new(@file).mtime
    assert_kind_of(Time, t1)
    assert_kind_of(Time, t2)
    assert_equal(t1, t2)
    assert_raise(Errno::ENOENT) { File.mtime(@nofile) }
  end

  def test_ctime
    t1 = File.ctime(@file)
    t2 = File.new(@file).ctime
    assert_kind_of(Time, t1)
    assert_kind_of(Time, t2)
    assert_equal(t1, t2)
    assert_raise(Errno::ENOENT) { File.ctime(@nofile) }
  end

  def test_chmod
    return if /cygwin|mswin|bccwin|mingw|emx/ =~ RUBY_PLATFORM
    assert_equal(1, File.chmod(0444, @file))
    assert_equal(0444, File.stat(@file).mode % 01000)
    assert_equal(0, File.new(@file).chmod(0222))
    assert_equal(0222, File.stat(@file).mode % 01000)
    File.chmod(0600, @file)
    assert_raise(Errno::ENOENT) { File.chmod(0600, @nofile) }
  end

  def test_lchmod
    return if /cygwin|mswin|bccwin|mingw|emx/ =~ RUBY_PLATFORM
    assert_equal(1, File.lchmod(0444, @file))
    assert_equal(0444, File.stat(@file).mode % 01000)
    File.lchmod(0600, @file)
    assert_raise(Errno::ENOENT) { File.lchmod(0600, @nofile) }
  rescue NotImplementedError
  end

  def test_chown ## xxx
  end

  def test_lchown ## xxx
  end

  def test_symlink
    return unless @symlinkfile
    assert_equal("link", File.ftype(@symlinkfile))
    assert_raise(Errno::EEXIST) { File.symlink(@file, @file) }
  end

  def test_utime
    t = Time.local(2000)
    File.utime(t + 1, t + 2, @zerofile)
    assert_equal(t + 1, File.atime(@zerofile))
    assert_equal(t + 2, File.mtime(@zerofile))
  end

  def test_hardlink
    return unless @hardlinkfile
    assert_equal("file", File.ftype(@hardlinkfile))
    assert_raise(Errno::EEXIST) { File.link(@file, @file) }
  end

  def test_symlink2
    return unless @symlinkfile
    assert_equal(@file, File.readlink(@symlinkfile))
    assert_raise(Errno::EINVAL) { File.readlink(@file) }
    assert_raise(Errno::ENOENT) { File.readlink(@nofile) }
  rescue NotImplementedError
  end

  def test_unlink
    assert_equal(1, File.unlink(@file))
    make_file("foo", @file)
    assert_raise(Errno::ENOENT) { File.unlink(@nofile) }
  end

  def test_rename
    assert_equal(0, File.rename(@file, @nofile))
    assert(!(File.exist?(@file)))
    assert(File.exist?(@nofile))
    assert_equal(0, File.rename(@nofile, @file))
    assert_raise(Errno::ENOENT) { File.rename(@nofile, @file) }
  end

  def test_umask
    return if /cygwin|mswin|bccwin|mingw|emx/ =~ RUBY_PLATFORM
    prev = File.umask(0777)
    assert_equal(0777, File.umask)
    open(@nofile, "w") { }
    assert_equal(0, File.stat(@nofile).mode % 01000)
    File.unlink(@nofile)
    assert_equal(0777, File.umask(prev))
    assert_raise(ArgumentError) { File.umask(0, 1, 2) }
  end

  def test_expand_path
    assert_equal(@file, File.expand_path(File.basename(@file), File.dirname(@file)))
    if /cygwin|mingw|mswin|bccwin/ =~ RUBY_PLATFORM
      assert_equal(@file, File.expand_path(@file + " "))
      assert_equal(@file, File.expand_path(@file + "."))
      assert_equal(@file, File.expand_path(@file + "::$DATA"))
    end
  end

  def test_basename
    assert_equal(File.basename(@file).sub(/\.test$/, ""), File.basename(@file, ".test"))
    assert_equal("", File.basename(""))
    assert_equal("foo", File.basename("foo"))
    assert_equal("foo", File.basename("foo", ".ext"))
    assert_equal("foo", File.basename("foo.ext", ".ext"))
    assert_equal("foo", File.basename("foo.ext", ".*"))
    if /cygwin|mingw|mswin|bccwin/ =~ RUBY_PLATFORM
      basename = File.basename(@file)
      assert_equal(basename, File.basename(@file + " "))
      assert_equal(basename, File.basename(@file + "."))
      assert_equal(basename, File.basename(@file + "::$DATA"))
      basename.chomp!(".test")
      assert_equal(basename, File.basename(@file + " ", ".test"))
      assert_equal(basename, File.basename(@file + ".", ".test"))
      assert_equal(basename, File.basename(@file + "::$DATA", ".test"))
      assert_equal(basename, File.basename(@file + " ", ".*"))
      assert_equal(basename, File.basename(@file + ".", ".*"))
      assert_equal(basename, File.basename(@file + "::$DATA", ".*"))
    end
  end

  def test_dirname
    assert(@file.start_with?(File.dirname(@file)))
    assert_equal(".", File.dirname(""))
  end

  def test_extname
    assert(".test", File.extname(@file))
    assert_equal("", File.extname("foo"))
    assert_equal("", File.extname("/foo"))
    assert_equal("", File.extname(".foo"))
    assert_equal("", File.extname("/.foo"))
    assert_equal("", File.extname("bar/.foo"))
    assert_equal("", File.extname("/bar/.foo"))
    assert_equal(".ext", File.extname("foo.ext"))
    assert_equal(".ext", File.extname("/foo.ext"))
    assert_equal(".ext", File.extname(".foo.ext"))
    assert_equal(".ext", File.extname("/.foo.ext"))
    assert_equal(".ext", File.extname("bar/.foo.ext"))
    assert_equal(".ext", File.extname("/bar/.foo.ext"))
    assert_equal("", File.extname(""))
    if /cygwin|mingw|mswin|bccwin/ =~ RUBY_PLATFORM
      assert_equal("", File.extname("foo "))
      assert_equal(".ext", File.extname("foo.ext "))
      assert_equal(".ext", File.extname("foo.ext."))
      assert_equal(".ext", File.extname("foo.ext::$DATA"))
      assert_equal("", File.extname("foo::$DATA.ext"))
    end
  end

  def test_split
    d, b = File.split(@file)
    assert_equal(File.dirname(@file), d)
    assert_equal(File.basename(@file), b)
  end

  def test_join
    s = "foo" + File::SEPARATOR + "bar" + File::SEPARATOR + "baz"
    assert_equal(s, File.join("foo", "bar", "baz"))
    assert_equal(s, File.join(["foo", "bar", "baz"]))
    o = Object.new
    def o.to_path; "foo"; end
    assert_equal(s, File.join(o, "bar", "baz"))
    assert_equal(s, File.join("foo" + File::SEPARATOR, "bar", File::SEPARATOR + "baz"))
  end

  def test_truncate
    assert_equal(0, File.truncate(@file, 1))
    assert(File.exist?(@file))
    assert_equal(1, File.size(@file))
    assert_equal(0, File.truncate(@file, 0))
    assert(File.exist?(@file))
    assert(File.zero?(@file))
    make_file("foo", @file)
    assert_raise(Errno::ENOENT) { File.truncate(@nofile, 0) }

    f = File.new(@file, "w")
    assert_equal(0, f.truncate(2))
    assert(File.exist?(@file))
    assert_equal(2, File.size(@file))
    assert_equal(0, f.truncate(0))
    assert(File.exist?(@file))
    assert(File.zero?(@file))
    f.close
    make_file("foo", @file)

    assert_raise(IOError) { File.new(@file).truncate(0) }
  rescue NotImplementedError
  end

  def test_flock ## xxx
    f = File.new(@file, "r+")
    f.flock(File::LOCK_EX)
    f.flock(File::LOCK_SH)
    f.flock(File::LOCK_UN)
    f.close
  rescue NotImplementedError
  end

  def test_test
    sleep(@time - Time.now + 1.1)
    make_file("foo", @file + "2")
    [@dir, @file, @zerofile, @symlinkfile, @hardlinkfile].compact.each do |f|
      assert_equal(File.atime(f), test(?A, f))
      assert_equal(File.ctime(f), test(?C, f))
      assert_equal(File.mtime(f), test(?M, f))
      assert_equal(File.blockdev?(f), test(?b, f))
      assert_equal(File.chardev?(f), test(?c, f))
      assert_equal(File.directory?(f), test(?d, f))
      assert_equal(File.exist?(f), test(?e, f))
      assert_equal(File.file?(f), test(?f, f))
      assert_equal(File.setgid?(f), test(?g, f))
      assert_equal(File.grpowned?(f), test(?G, f))
      assert_equal(File.sticky?(f), test(?k, f))
      assert_equal(File.symlink?(f), test(?l, f))
      assert_equal(File.owned?(f), test(?o, f))
      assert_nothing_raised { test(?O, f) }
      assert_equal(File.pipe?(f), test(?p, f))
      assert_equal(File.readable?(f), test(?r, f))
      assert_equal(File.readable_real?(f), test(?R, f))
      assert_equal(File.size?(f), test(?s, f))
      assert_equal(File.socket?(f), test(?S, f))
      assert_equal(File.setuid?(f), test(?u, f))
      assert_equal(File.writable?(f), test(?w, f))
      assert_equal(File.world_writable?(f), test(?W, f))
      assert_equal(File.executable?(f), test(?x, f))
      assert_equal(File.executable_real?(f), test(?X, f))
      assert_equal(File.zero?(f), test(?z, f))
    end
    assert_equal(false, test(?-, @dir, @file))
    assert_equal(true, test(?-, @file, @file))
    assert_equal(true, test(?=, @file, @file))
    assert_equal(false, test(?>, @file, @file))
    assert_equal(false, test(?<, @file, @file))
    unless /cygwin/ =~ RUBY_PLATFORM
      assert_equal(false, test(?=, @file, @file + "2"))
      assert_equal(false, test(?>, @file, @file + "2"))
      assert_equal(true, test(?>, @file + "2", @file))
      assert_equal(true, test(?<, @file, @file + "2"))
      assert_equal(false, test(?<, @file + "2", @file))
    end
    assert_raise(ArgumentError) { test }
    assert_raise(Errno::ENOENT) { test(?A, @nofile) }
    assert_raise(ArgumentError) { test(?a) }
    assert_raise(ArgumentError) { test("\0".ord) }
  end

  def test_stat_init
    sleep(@time - Time.now + 1.1)
    make_file("foo", @file + "2")
    fs1, fs2 = File::Stat.new(@file), File::Stat.new(@file + "2")
    assert_nothing_raised do
      assert_equal(0, fs1 <=> fs1)
      assert_equal(-1, fs1 <=> fs2)
      assert_equal(1, fs2 <=> fs1)
      assert_nil(fs1 <=> nil)
      assert_integer(fs1.dev)
      assert_integer_or_nil(fs1.rdev)
      assert_integer_or_nil(fs1.dev_major)
      assert_integer_or_nil(fs1.dev_minor)
      assert_integer_or_nil(fs1.rdev_major)
      assert_integer_or_nil(fs1.rdev_minor)
      assert_integer(fs1.ino)
      assert_integer(fs1.mode)
      unless /emx/ =~ RUBY_PLATFORM
        assert_equal(@hardlinkfile ? 2 : 1, fs1.nlink)
      end
      assert_integer(fs1.uid)
      assert_integer(fs1.gid)
      assert_equal(3, fs1.size)
      assert_integer_or_nil(fs1.blksize)
      assert_integer_or_nil(fs1.blocks)
      assert_kind_of(Time, fs1.atime)
      assert_kind_of(Time, fs1.mtime)
      assert_kind_of(Time, fs1.ctime)
      assert_kind_of(String, fs1.inspect)
    end
    assert_raise(Errno::ENOENT) { File::Stat.new(@nofile) }
    assert_kind_of(File::Stat, File::Stat.new(@file).dup)
    assert_raise(TypeError) do
      File::Stat.new(@file).instance_eval { initialize_copy(0) }
    end
  end

  def test_stat_ftype
    assert_equal("directory", File::Stat.new(@dir).ftype)
    assert_equal("file", File::Stat.new(@file).ftype)
    # File::Stat uses stat
    assert_equal("file", File::Stat.new(@symlinkfile).ftype) if @symlinkfile
    assert_equal("file", File::Stat.new(@hardlinkfile).ftype) if @hardlinkfile
  end

  def test_stat_directory_p
    assert(File::Stat.new(@dir).directory?)
    assert(!(File::Stat.new(@file).directory?))
  end

  def test_stat_pipe_p ## xxx
    assert(!(File::Stat.new(@dir).pipe?))
    assert(!(File::Stat.new(@file).pipe?))
  end

  def test_stat_symlink_p
    assert(!(File::Stat.new(@dir).symlink?))
    assert(!(File::Stat.new(@file).symlink?))
    # File::Stat uses stat
    assert(!(File::Stat.new(@symlinkfile).symlink?)) if @symlinkfile
    assert(!(File::Stat.new(@hardlinkfile).symlink?)) if @hardlinkfile
  end

  def test_stat_socket_p ## xxx
    assert(!(File::Stat.new(@dir).socket?))
    assert(!(File::Stat.new(@file).socket?))
  end

  def test_stat_blockdev_p ## xxx
    assert(!(File::Stat.new(@dir).blockdev?))
    assert(!(File::Stat.new(@file).blockdev?))
  end

  def test_stat_chardev_p ## xxx
    assert(!(File::Stat.new(@dir).chardev?))
    assert(!(File::Stat.new(@file).chardev?))
  end

  def test_stat_readable_p
    return if /cygwin|mswin|bccwin|mingw|emx/ =~ RUBY_PLATFORM
    File.chmod(0200, @file)
    assert(!(File::Stat.new(@file).readable?))
    File.chmod(0600, @file)
    assert(File::Stat.new(@file).readable?)
  end

  def test_stat_readable_real_p
    return if /cygwin|mswin|bccwin|mingw|emx/ =~ RUBY_PLATFORM
    File.chmod(0200, @file)
    assert(!(File::Stat.new(@file).readable_real?))
    File.chmod(0600, @file)
    assert(File::Stat.new(@file).readable_real?)
  end

  def test_stat_world_readable_p
    return if /cygwin|mswin|bccwin|mingw|emx/ =~ RUBY_PLATFORM
    File.chmod(0006, @file)
    assert(File::Stat.new(@file).world_readable?)
    File.chmod(0060, @file)
    assert(!(File::Stat.new(@file).world_readable?))
    File.chmod(0600, @file)
    assert(!(File::Stat.new(@file).world_readable?))
  end

  def test_stat_writable_p
    return if /cygwin|mswin|bccwin|mingw|emx/ =~ RUBY_PLATFORM
    File.chmod(0400, @file)
    assert(!(File::Stat.new(@file).writable?))
    File.chmod(0600, @file)
    assert(File::Stat.new(@file).writable?)
  end

  def test_stat_writable_real_p
    return if /cygwin|mswin|bccwin|mingw|emx/ =~ RUBY_PLATFORM
    File.chmod(0400, @file)
    assert(!(File::Stat.new(@file).writable_real?))
    File.chmod(0600, @file)
    assert(File::Stat.new(@file).writable_real?)
  end

  def test_stat_world_writable_p
    return if /cygwin|mswin|bccwin|mingw|emx/ =~ RUBY_PLATFORM
    File.chmod(0006, @file)
    assert(File::Stat.new(@file).world_writable?)
    File.chmod(0060, @file)
    assert(!(File::Stat.new(@file).world_writable?))
    File.chmod(0600, @file)
    assert(!(File::Stat.new(@file).world_writable?))
  end

  def test_stat_executable_p
    return if /cygwin|mswin|bccwin|mingw|emx/ =~ RUBY_PLATFORM
    File.chmod(0100, @file)
    assert(File::Stat.new(@file).executable?)
    File.chmod(0600, @file)
    assert(!(File::Stat.new(@file).executable?))
  end

  def test_stat_executable_real_p
    return if /cygwin|mswin|bccwin|mingw|emx/ =~ RUBY_PLATFORM
    File.chmod(0100, @file)
    assert(File::Stat.new(@file).executable_real?)
    File.chmod(0600, @file)
    assert(!(File::Stat.new(@file).executable_real?))
  end

  def test_stat_file_p
    assert(!(File::Stat.new(@dir).file?))
    assert(File::Stat.new(@file).file?)
  end

  def test_stat_zero_p
    assert_nothing_raised { File::Stat.new(@dir).zero? }
    assert(!(File::Stat.new(@file).zero?))
    assert(File::Stat.new(@zerofile).zero?)
  end

  def test_stat_size_p
    assert_nothing_raised { File::Stat.new(@dir).size? }
    assert_equal(3, File::Stat.new(@file).size?)
    assert(!(File::Stat.new(@zerofile).size?))
  end

  def test_stat_owned_p ## xxx
    return if /cygwin|mswin|bccwin|mingw|emx/ =~ RUBY_PLATFORM
    assert(File::Stat.new(@file).owned?)
    assert(File::Stat.new(@file).grpowned?)
  end

  def test_stat_suid_sgid_sticky ## xxx
    assert(!(File::Stat.new(@file).setuid?))
    assert(!(File::Stat.new(@file).setgid?))
    assert(!(File::Stat.new(@file).sticky?))
  end

  def test_stat_size
    assert_integer(File::Stat.new(@dir).size)
    assert_equal(3, File::Stat.new(@file).size)
    assert_equal(0, File::Stat.new(@zerofile).size)
  end

  def test_path_check
    assert_nothing_raised { ENV["PATH"] }
  end

  def test_find_file
    assert_raise(SecurityError) do
      Thread.new do
        $SAFE = 4
        load(@file)
      end.join
    end
  end
end
