diff --git a/ChangeLog b/ChangeLog
index 727f736a11..dba515d8ae 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Sun Feb 03 21:13:13 2008  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* test/ruby/test_numeric.rb: forgot to add this (at r15360).
+	* test/ruby/test_file_exhaustive.rb: add tests to achive over 80% test
+	  coverage of file.c.
+
 Sat Feb  2 20:06:42 2008  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* lib/benchmark.rb (Benchmark::realtime): make Benchmark#realtime
diff --git a/test/ruby/test_file_exhaustive.rb b/test/ruby/test_file_exhaustive.rb
new file mode 100644
index 0000000000..df35d4256e
--- /dev/null
+++ b/test/ruby/test_file_exhaustive.rb
@@ -0,0 +1,688 @@
+require "test/unit"
+require "fileutils"
+require "tmpdir"
+
+class TestFileExhaustive < Test::Unit::TestCase
+  def setup
+    @dir = Dir.mktmpdir("rubytest-file")
+    @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
+      @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?(Fixnum), 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 /(mswin|bccwin|mingw|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?(@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 /(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 /(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 /(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 /(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 /(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 /(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 /(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 /(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 /(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 /(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 /(mswin|bccwin|mingw|emx)/ =~ RUBY_PLATFORM
+    assert_equal(1, File.lchmod(0444, @file))
+    assert_equal(0444, File.stat(@file).mode % 01000)
+    assert_equal(0, File.new(@file).lchmod(0222))
+    assert_equal(0222, 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_symlink
+    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 /(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)))
+  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"))
+  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(""))
+  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, "w")
+    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 + "2"))
+    assert_equal(false, test(?>, @file, @file))
+    assert_equal(false, test(?>, @file, @file + "2"))
+    assert_equal(true, test(?>, @file + "2", @file))
+    assert_equal(false, test(?<, @file, @file))
+    assert_equal(true, test(?<, @file, @file + "2"))
+    assert_equal(false, test(?<, @file + "2", @file))
+    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 /(mswin|bccwin|mingw|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 /(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 /(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 /(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 /(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 /(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 /(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 /(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 /(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 /(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
diff --git a/test/ruby/test_numeric.rb b/test/ruby/test_numeric.rb
new file mode 100644
index 0000000000..b94f2cba59
--- /dev/null
+++ b/test/ruby/test_numeric.rb
@@ -0,0 +1,446 @@
+require 'test/unit'
+
+class TestNumeric < Test::Unit::TestCase
+  class DummyNumeric < Numeric
+  end
+
+  def test_coerce
+    a, b = 1.coerce(2)
+    assert_equal(Fixnum, a.class)
+    assert_equal(Fixnum, b.class)
+
+    a, b = 1.coerce(2.0)
+    assert_equal(Float, a.class)
+    assert_equal(Float, b.class)
+
+    assert_raise(TypeError) { -Numeric.new }
+  end
+
+  def test_dummynumeric
+    a = DummyNumeric.new
+
+    DummyNumeric.class_eval do
+      def coerce(x); nil; end
+    end
+    assert_raise(TypeError) { -a }
+    assert_nil(1 <=> a)
+    assert_raise(ArgumentError) { 1 <= a }
+
+    DummyNumeric.class_eval do
+      def coerce(x); 1.coerce(x); end
+    end
+    assert_equal(2, 1 + a)
+    assert_equal(0, 1 <=> a)
+    assert(1 <= a)
+
+    DummyNumeric.class_eval do
+      def coerce(x); [x, 1]; end
+    end
+    assert_equal(-1, -a)
+
+  ensure
+    DummyNumeric.class_eval do
+      remove_method :coerce
+    end
+  end
+
+  def test_numeric
+    a = Numeric.new
+    assert_raise(TypeError) { def a.foo; end }
+    assert_raise(TypeError) { a.dup }
+  end
+
+  def test_quo
+    DummyNumeric.class_eval do
+      def /(x); :div; end
+    end
+
+    assert_equal(:div, DummyNumeric.new.quo(0))
+
+  ensure
+    DummyNumeric.class_eval do
+      remove_method :/
+    end
+  end
+
+  def test_divmod
+    DummyNumeric.class_eval do
+      def /(x); 42.0; end
+      def %(x); :mod; end
+    end
+
+    assert_equal(42, DummyNumeric.new.div(0))
+    assert_equal(:mod, DummyNumeric.new.modulo(0))
+    assert_equal([42, :mod], DummyNumeric.new.divmod(0))
+
+  ensure
+    DummyNumeric.class_eval do
+      remove_method :/, :%
+    end
+  end
+
+  def test_scalar_p
+    assert(Numeric.new.scalar?)
+  end
+
+  def test_integer_p
+    assert(!Numeric.new.integer?)
+  end
+
+  def test_abs
+    a = DummyNumeric.new
+    DummyNumeric.class_eval do
+      def -@; :ok; end
+      def <(x); true; end
+    end
+
+    assert_equal(:ok, a.abs)
+
+    DummyNumeric.class_eval do
+      def <(x); false; end
+    end
+
+    assert_equal(a, a.abs)
+
+  ensure
+    DummyNumeric.class_eval do
+      remove_method :-@, :<
+    end
+  end
+
+  def test_zero_p
+    DummyNumeric.class_eval do
+      def ==(x); true; end
+    end
+
+    assert(DummyNumeric.new.zero?)
+
+  ensure
+    DummyNumeric.class_eval do
+      remove_method :==
+    end
+  end
+
+  def test_to_int
+    DummyNumeric.class_eval do
+      def to_i; :ok; end
+    end
+
+    assert_equal(:ok, DummyNumeric.new.to_int)
+
+  ensure
+    DummyNumeric.class_eval do
+      remove_method :to_i
+    end
+  end
+
+  def test_cmp
+    a = Numeric.new
+    assert_equal(0, a <=> a)
+    assert_nil(a <=> :foo)
+  end
+
+  def test_floor_ceil_round_truncate
+    DummyNumeric.class_eval do
+      def to_f; 1.5; end
+    end
+
+    a = DummyNumeric.new
+    assert_equal(1, a.floor)
+    assert_equal(2, a.ceil)
+    assert_equal(2, a.round)
+    assert_equal(1, a.truncate)
+
+    DummyNumeric.class_eval do
+      def to_f; 1.4; end
+    end
+
+    a = DummyNumeric.new
+    assert_equal(1, a.floor)
+    assert_equal(2, a.ceil)
+    assert_equal(1, a.round)
+    assert_equal(1, a.truncate)
+
+    DummyNumeric.class_eval do
+      def to_f; -1.5; end
+    end
+
+    a = DummyNumeric.new
+    assert_equal(-2, a.floor)
+    assert_equal(-1, a.ceil)
+    assert_equal(-2, a.round)
+    assert_equal(-1, a.truncate)
+
+  ensure
+    DummyNumeric.class_eval do
+      remove_method :to_f
+    end
+  end
+
+  def test_step
+    a = []
+    1.step(10) {|x| a << x }
+    assert_equal([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], a)
+
+    a = []
+    1.step(10, 2) {|x| a << x }
+    assert_equal([1, 3, 5, 7, 9], a)
+
+    assert_raise(ArgumentError) { 1.step(10, 1, 0) { } }
+    assert_raise(ArgumentError) { 1.step(10, 0) { } }
+
+    a = []
+    10.step(1, -2) {|x| a << x }
+    assert_equal([10, 8, 6, 4, 2], a)
+
+    a = []
+    1.0.step(10.0, 2.0) {|x| a << x }
+    assert_equal([1.0, 3.0, 5.0, 7.0, 9.0], a)
+
+    a = []
+    1.step(10, 2**32) {|x| a << x }
+    assert_equal([1], a)
+
+    a = []
+    10.step(1, -(2**32)) {|x| a << x }
+    assert_equal([10], a)
+  end
+
+  def test_num2long
+    assert_raise(TypeError) { 1 & nil }
+    assert_equal(1, 1 & 1.0)
+    assert_raise(RangeError) { 1 & 2147483648.0 }
+    o = Object.new
+    def o.to_int; 1; end
+    assert_equal(1, 1 & o)
+  end
+
+  def test_eql
+    assert(1 == 1.0)
+    assert(!(1.eql?(1.0)))
+    assert(!(1.eql?(2)))
+  end
+end
+require 'test/unit'
+
+class TestNumeric < Test::Unit::TestCase
+  class DummyNumeric < Numeric
+  end
+
+  def test_coerce
+    a, b = 1.coerce(2)
+    assert_equal(Fixnum, a.class)
+    assert_equal(Fixnum, b.class)
+
+    a, b = 1.coerce(2.0)
+    assert_equal(Float, a.class)
+    assert_equal(Float, b.class)
+
+    assert_raise(TypeError) { -Numeric.new }
+  end
+
+  def test_dummynumeric
+    a = DummyNumeric.new
+
+    DummyNumeric.class_eval do
+      def coerce(x); nil; end
+    end
+    assert_raise(TypeError) { -a }
+    assert_nil(1 <=> a)
+    assert_raise(ArgumentError) { 1 <= a }
+
+    DummyNumeric.class_eval do
+      def coerce(x); 1.coerce(x); end
+    end
+    assert_equal(2, 1 + a)
+    assert_equal(0, 1 <=> a)
+    assert(1 <= a)
+
+    DummyNumeric.class_eval do
+      def coerce(x); [x, 1]; end
+    end
+    assert_equal(-1, -a)
+
+  ensure
+    DummyNumeric.class_eval do
+      remove_method :coerce
+    end
+  end
+
+  def test_numeric
+    a = Numeric.new
+    assert_raise(TypeError) { def a.foo; end }
+    assert_raise(TypeError) { a.dup }
+  end
+
+  def test_quo
+    DummyNumeric.class_eval do
+      def /(x); :div; end
+    end
+
+    assert_equal(:div, DummyNumeric.new.quo(0))
+
+  ensure
+    DummyNumeric.class_eval do
+      remove_method :/
+    end
+  end
+
+  def test_divmod
+    DummyNumeric.class_eval do
+      def /(x); 42.0; end
+      def %(x); :mod; end
+    end
+
+    assert_equal(42, DummyNumeric.new.div(0))
+    assert_equal(:mod, DummyNumeric.new.modulo(0))
+    assert_equal([42, :mod], DummyNumeric.new.divmod(0))
+
+  ensure
+    DummyNumeric.class_eval do
+      remove_method :/, :%
+    end
+  end
+
+  def test_scalar_p
+    assert(Numeric.new.scalar?)
+  end
+
+  def test_integer_p
+    assert(!Numeric.new.integer?)
+  end
+
+  def test_abs
+    a = DummyNumeric.new
+    DummyNumeric.class_eval do
+      def -@; :ok; end
+      def <(x); true; end
+    end
+
+    assert_equal(:ok, a.abs)
+
+    DummyNumeric.class_eval do
+      def <(x); false; end
+    end
+
+    assert_equal(a, a.abs)
+
+  ensure
+    DummyNumeric.class_eval do
+      remove_method :-@, :<
+    end
+  end
+
+  def test_zero_p
+    DummyNumeric.class_eval do
+      def ==(x); true; end
+    end
+
+    assert(DummyNumeric.new.zero?)
+
+  ensure
+    DummyNumeric.class_eval do
+      remove_method :==
+    end
+  end
+
+  def test_to_int
+    DummyNumeric.class_eval do
+      def to_i; :ok; end
+    end
+
+    assert_equal(:ok, DummyNumeric.new.to_int)
+
+  ensure
+    DummyNumeric.class_eval do
+      remove_method :to_i
+    end
+  end
+
+  def test_cmp
+    a = Numeric.new
+    assert_equal(0, a <=> a)
+    assert_nil(a <=> :foo)
+  end
+
+  def test_floor_ceil_round_truncate
+    DummyNumeric.class_eval do
+      def to_f; 1.5; end
+    end
+
+    a = DummyNumeric.new
+    assert_equal(1, a.floor)
+    assert_equal(2, a.ceil)
+    assert_equal(2, a.round)
+    assert_equal(1, a.truncate)
+
+    DummyNumeric.class_eval do
+      def to_f; 1.4; end
+    end
+
+    a = DummyNumeric.new
+    assert_equal(1, a.floor)
+    assert_equal(2, a.ceil)
+    assert_equal(1, a.round)
+    assert_equal(1, a.truncate)
+
+    DummyNumeric.class_eval do
+      def to_f; -1.5; end
+    end
+
+    a = DummyNumeric.new
+    assert_equal(-2, a.floor)
+    assert_equal(-1, a.ceil)
+    assert_equal(-2, a.round)
+    assert_equal(-1, a.truncate)
+
+  ensure
+    DummyNumeric.class_eval do
+      remove_method :to_f
+    end
+  end
+
+  def test_step
+    a = []
+    1.step(10) {|x| a << x }
+    assert_equal([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], a)
+
+    a = []
+    1.step(10, 2) {|x| a << x }
+    assert_equal([1, 3, 5, 7, 9], a)
+
+    assert_raise(ArgumentError) { 1.step(10, 1, 0) { } }
+    assert_raise(ArgumentError) { 1.step(10, 0) { } }
+
+    a = []
+    10.step(1, -2) {|x| a << x }
+    assert_equal([10, 8, 6, 4, 2], a)
+
+    a = []
+    1.0.step(10.0, 2.0) {|x| a << x }
+    assert_equal([1.0, 3.0, 5.0, 7.0, 9.0], a)
+
+    a = []
+    1.step(10, 2**32) {|x| a << x }
+    assert_equal([1], a)
+
+    a = []
+    10.step(1, -(2**32)) {|x| a << x }
+    assert_equal([10], a)
+  end
+
+  def test_num2long
+    assert_raise(TypeError) { 1 & nil }
+    assert_equal(1, 1 & 1.0)
+    assert_raise(RangeError) { 1 & 2147483648.0 }
+    o = Object.new
+    def o.to_int; 1; end
+    assert_equal(1, 1 & o)
+  end
+
+  def test_eql
+    assert(1 == 1.0)
+    assert(!(1.eql?(1.0)))
+    assert(!(1.eql?(2)))
+  end
+end