Add 'mrbgems/mruby-io/' from commit '3c8e1f94c44252c836f79a48bb17726da28e2756'

git-subtree-dir: mrbgems/mruby-io
git-subtree-mainline: 10ed730e4bd921cf4d8fe6f6d2e3cb3f0840f3b7
git-subtree-split: 3c8e1f94c44252c836f79a48bb17726da28e2756

5 files changed, 1109 insertions, 0 deletions

diff --git a/mrbgems/mruby-io/test/file.rb b/mrbgems/mruby-io/test/file.rb
new file mode 100644
index 000000000..941e91ac4
--- /dev/null
+++ b/mrbgems/mruby-io/test/file.rb
@@ -0,0 +1,188 @@
+##
+# IO Test
+
+assert('File', '15.2.21') do
+  File.class == Class
+end
+
+assert('File', '15.2.21.2') do
+  File.superclass == IO
+end
+
+assert('File TEST SETUP') do
+  MRubyIOTestUtil.io_test_setup
+end
+
+assert('File#initialize', '15.2.21.4.1') do
+  io = File.open($mrbtest_io_rfname, "r")
+  assert_nil io.close
+  assert_raise IOError do
+    io.close
+  end
+end
+
+assert('File#path', '15.2.21.4.2') do
+  io = File.open($mrbtest_io_rfname, "r")
+  assert_equal $mrbtest_io_msg, io.read
+  assert_equal $mrbtest_io_rfname, io.path
+  io.close
+  assert_equal $mrbtest_io_rfname, io.path
+  io.closed?
+end
+
+assert('File.basename') do
+  assert_equal '/', File.basename('//')
+  assert_equal 'a', File.basename('/a/')
+  assert_equal 'b', File.basename('/a/b')
+  assert_equal 'b', File.basename('../a/b')
+end
+
+assert('File.dirname') do
+  assert_equal '.',    File.dirname('')
+  assert_equal '.',    File.dirname('a')
+  assert_equal '/',    File.dirname('/a')
+  assert_equal 'a',    File.dirname('a/b')
+  assert_equal '/a',   File.dirname('/a/b')
+end
+
+assert('File.extname') do
+  assert_equal '.txt', File.extname('foo/foo.txt')
+  assert_equal '.gz',  File.extname('foo/foo.tar.gz')
+  assert_equal '', File.extname('foo/bar')
+  assert_equal '', File.extname('foo/.bar')
+  assert_equal '', File.extname('foo.txt/bar')
+  assert_equal '', File.extname('.foo')
+end
+
+assert('IO#flock') do
+  f = File.open $mrbtest_io_rfname
+  begin
+    assert_equal(f.flock(File::LOCK_SH), 0)
+    assert_equal(f.flock(File::LOCK_UN), 0)
+    assert_equal(f.flock(File::LOCK_EX | File::LOCK_NB), 0)
+    assert_equal(f.flock(File::LOCK_UN), 0)
+  rescue NotImplementedError => e
+    skip e.message
+  ensure
+    f.close
+  end
+end
+
+assert('File.join') do
+  assert_equal "", File.join()
+  assert_equal "a", File.join("a")
+  assert_equal "/a", File.join("/a")
+  assert_equal "a/", File.join("a/")
+  assert_equal "a/b/c", File.join("a", "b", "c")
+  assert_equal "/a/b/c", File.join("/a", "b", "c")
+  assert_equal "a/b/c/", File.join("a", "b", "c/")
+  assert_equal "a/b/c", File.join("a/", "/b/", "/c")
+  assert_equal "a/b/c", File.join(["a", "b", "c"])
+  assert_equal "a/b/c", File.join("a", ["b", ["c"]])
+end
+
+assert('File.realpath') do
+  if File::ALT_SEPARATOR
+    readme_path = File._getwd + File::ALT_SEPARATOR + "README.md"
+    assert_equal readme_path, File.realpath("README.md")
+  else
+    dir = MRubyIOTestUtil.mkdtemp("mruby-io-test.XXXXXX")
+    begin
+      dir1 = File.realpath($mrbtest_io_rfname)
+      dir2 = File.realpath("./#{dir}//./../#{$mrbtest_io_symlinkname}")
+      assert_equal dir1, dir2
+    ensure
+      MRubyIOTestUtil.rmdir dir
+    end
+  end
+end
+
+assert("File.readlink") do
+  begin
+    assert_equal $mrbtest_io_rfname, File.readlink($mrbtest_io_symlinkname)
+  rescue NotImplementedError => e
+    skip e.message
+  end
+end
+
+assert("File.readlink fails with non-symlink") do
+  begin
+    assert_raise(RuntimeError) {
+      begin
+        File.readlink($mrbtest_io_rfname)
+      rescue => e
+        if Object.const_defined?(:SystemCallError) and e.kind_of?(SystemCallError)
+          raise RuntimeError, "SystemCallError converted to RuntimeError"
+        end
+        raise e
+      end
+    }
+  rescue NotImplementedError => e
+    skip e.message
+  end
+end
+
+assert('File TEST CLEANUP') do
+  assert_nil MRubyIOTestUtil.io_test_cleanup
+end
+
+assert('File.expand_path') do
+  assert_equal "/",    File.expand_path("..", "/tmp"),       "parent path with base_dir (1)"
+  assert_equal "/tmp", File.expand_path("..", "/tmp/mruby"), "parent path with base_dir (2)"
+
+  assert_equal "/home", File.expand_path("/home"),      "absolute"
+  assert_equal "/home", File.expand_path("/home", "."), "absolute with base_dir"
+
+  assert_equal "/hoge", File.expand_path("/tmp/..//hoge")
+  assert_equal "/hoge", File.expand_path("////tmp/..///////hoge")
+
+  assert_equal "/", File.expand_path("../../../..", "/")
+  if File._getwd[1] == ":"
+    drive_letter = File._getwd[0]
+    assert_equal drive_letter + ":\\", File.expand_path(([".."] * 100).join("/"))
+  else
+    assert_equal "/", File.expand_path(([".."] * 100).join("/"))
+  end
+end
+
+assert('File.expand_path (with ENV)') do
+  skip unless Object.const_defined?(:ENV) && ENV['HOME']
+
+  assert_equal ENV['HOME'], File.expand_path("~/"),      "home"
+  assert_equal ENV['HOME'], File.expand_path("~/", "/"), "home with base_dir"
+
+  assert_equal "#{ENV['HOME']}/user", File.expand_path("user", ENV['HOME']), "relative with base_dir"
+end
+
+assert('File.path') do
+  assert_equal "", File.path("")
+  assert_equal "a/b/c", File.path("a/b/c")
+  assert_equal "a/../b/./c", File.path("a/../b/./c")
+  assert_raise(TypeError) { File.path(nil) }
+  assert_raise(TypeError) { File.path(123) }
+
+end
+
+assert('File.symlink') do
+  target_name = "/usr/bin"
+  symlink_name = "test-bin-dummy"
+  if !File.exist?(target_name)
+    skip("target directory of File.symlink is not found")
+  else
+    assert_equal 0, File.symlink(target_name, symlink_name)
+    begin
+      assert_equal true, File.symlink?(symlink_name)
+    ensure
+      File.delete symlink_name
+    end
+  end
+end
+
+assert('File.chmod') do
+  File.open('chmod-test', 'w') {}
+  begin
+    assert_equal 1, File.chmod(0400, 'chmod-test')
+  ensure
+    File.delete('chmod-test')
+  end
+end
diff --git a/mrbgems/mruby-io/test/file_test.rb b/mrbgems/mruby-io/test/file_test.rb
new file mode 100644
index 000000000..2c831f0d5
--- /dev/null
+++ b/mrbgems/mruby-io/test/file_test.rb
@@ -0,0 +1,117 @@
+##
+# FileTest
+
+assert('FileTest TEST SETUP') do
+  MRubyIOTestUtil.io_test_setup
+end
+
+assert("FileTest.directory?") do
+  dir = MRubyIOTestUtil.mkdtemp("mruby-io-test.XXXXXX")
+  begin
+    assert_true  FileTest.directory?(dir)
+    assert_false FileTest.directory?($mrbtest_io_rfname)
+  ensure
+    MRubyIOTestUtil.rmdir dir
+  end
+end
+
+assert("FileTest.exist?") do
+  assert_equal true,  FileTest.exist?($mrbtest_io_rfname), "filename - exist"
+  assert_equal false, FileTest.exist?($mrbtest_io_rfname + "-"), "filename - not exist"
+  io = IO.new(IO.sysopen($mrbtest_io_rfname))
+  assert_equal true,  FileTest.exist?(io), "io obj - exist"
+  io.close
+  assert_equal true, io.closed?
+  assert_raise IOError do
+    FileTest.exist?(io)
+  end
+end
+
+assert("FileTest.file?") do
+  dir = MRubyIOTestUtil.mkdtemp("mruby-io-test.XXXXXX")
+  begin
+    assert_true  FileTest.file?($mrbtest_io_rfname)
+    assert_false FileTest.file?(dir)
+  ensure
+    MRubyIOTestUtil.rmdir dir
+  end
+end
+
+assert("FileTest.pipe?") do
+  begin
+    assert_equal false, FileTest.pipe?("/tmp")
+    io = IO.popen("ls")
+    assert_equal true,  FileTest.pipe?(io)
+  rescue NotImplementedError => e
+    skip e.message
+  end
+end
+
+assert('FileTest.size') do
+  assert_equal FileTest.size($mrbtest_io_rfname), $mrbtest_io_msg.size
+  assert_equal FileTest.size($mrbtest_io_wfname), 0
+end
+
+assert("FileTest.size?") do
+  assert_equal $mrbtest_io_msg.size, FileTest.size?($mrbtest_io_rfname)
+  assert_equal nil, FileTest.size?($mrbtest_io_wfname)
+  assert_equal nil, FileTest.size?("not-exist-test-target-file")
+
+  fp1 = File.open($mrbtest_io_rfname)
+  fp2 = File.open($mrbtest_io_wfname)
+  assert_equal $mrbtest_io_msg.size,  FileTest.size?(fp1)
+  assert_equal nil, FileTest.size?(fp2)
+  fp1.close
+  fp2.close
+
+  assert_raise IOError do
+    FileTest.size?(fp1)
+  end
+  assert_raise IOError do
+    FileTest.size?(fp2)
+  end
+
+  fp1.closed? && fp2.closed?
+end
+
+assert("FileTest.socket?") do
+  begin
+    assert_true FileTest.socket?($mrbtest_io_socketname)
+  rescue NotImplementedError => e
+    skip e.message
+  end
+end
+
+assert("FileTest.symlink?") do
+  begin
+    assert_true FileTest.symlink?($mrbtest_io_symlinkname)
+  rescue NotImplementedError => e
+    skip e.message
+  end
+end
+
+assert("FileTest.zero?") do
+  assert_equal false, FileTest.zero?($mrbtest_io_rfname)
+  assert_equal true,  FileTest.zero?($mrbtest_io_wfname)
+  assert_equal false, FileTest.zero?("not-exist-test-target-file")
+
+  fp1 = File.open($mrbtest_io_rfname)
+  fp2 = File.open($mrbtest_io_wfname)
+  assert_equal false, FileTest.zero?(fp1)
+  assert_equal true,  FileTest.zero?(fp2)
+  fp1.close
+  fp2.close
+
+  assert_raise IOError do
+    FileTest.zero?(fp1)
+  end
+  assert_raise IOError do
+    FileTest.zero?(fp2)
+  end
+
+  fp1.closed? && fp2.closed?
+end
+
+assert('FileTest TEST CLEANUP') do
+  assert_nil MRubyIOTestUtil.io_test_cleanup
+end
diff --git a/mrbgems/mruby-io/test/gc_filedes.sh b/mrbgems/mruby-io/test/gc_filedes.sh
new file mode 100644
index 000000000..6e5d1bbf1
--- /dev/null
+++ b/mrbgems/mruby-io/test/gc_filedes.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+
+ulimit -n 20
+mruby -e '100.times { File.open "'$0'" }'
diff --git a/mrbgems/mruby-io/test/io.rb b/mrbgems/mruby-io/test/io.rb
new file mode 100644
index 000000000..df646977a
--- /dev/null
+++ b/mrbgems/mruby-io/test/io.rb
@@ -0,0 +1,609 @@
+##
+# IO Test
+
+unless Object.respond_to? :assert_nothing_raised
+  def assert_nothing_raised(*exp)
+    ret = true
+    if $mrbtest_assert
+      $mrbtest_assert_idx += 1
+      msg = exp.last.class == String ? exp.pop : ""
+      begin
+        yield
+      rescue Exception => e
+        msg = "#{msg} exception raised."
+        diff = "      Class: <#{e.class}>\n" +
+          "    Message: #{e.message}"
+        $mrbtest_assert.push([$mrbtest_assert_idx, msg, diff])
+        ret = false
+      end
+    end
+    ret
+  end
+end
+
+assert('IO TEST SETUP') do
+  MRubyIOTestUtil.io_test_setup
+end
+
+assert('IO', '15.2.20') do
+  assert_equal(Class, IO.class)
+end
+
+assert('IO', '15.2.20.2') do
+  assert_equal(Object, IO.superclass)
+end
+
+assert('IO', '15.2.20.3') do
+  assert_include(IO.included_modules, Enumerable)
+end
+
+assert('IO.open', '15.2.20.4.1') do
+  fd = IO.sysopen $mrbtest_io_rfname
+  assert_equal Fixnum, fd.class
+  io = IO.open fd
+  assert_equal IO, io.class
+  assert_equal $mrbtest_io_msg, io.read
+  io.close
+
+  fd = IO.sysopen $mrbtest_io_rfname
+  IO.open(fd) do |io|
+    assert_equal $mrbtest_io_msg, io.read
+  end
+
+  true
+end
+
+assert('IO#close', '15.2.20.5.1') do
+  io = IO.new(IO.sysopen($mrbtest_io_rfname))
+  assert_nil io.close
+end
+
+assert('IO#closed?', '15.2.20.5.2') do
+  io = IO.new(IO.sysopen($mrbtest_io_rfname))
+  assert_false io.closed?
+  io.close
+  assert_true io.closed?
+end
+
+#assert('IO#each', '15.2.20.5.3') do
+#assert('IO#each_byte', '15.2.20.5.4') do
+#assert('IO#each_line', '15.2.20.5.5') do
+
+assert('IO#eof?', '15.2.20.5.6') do
+  io = IO.new(IO.sysopen($mrbtest_io_wfname, 'w'), 'w')
+  assert_raise(IOError) do
+    io.eof?
+  end
+  io.close
+
+  # empty file
+  io = IO.open(IO.sysopen($mrbtest_io_wfname, 'w'), 'w')
+  io.close
+  io = IO.open(IO.sysopen($mrbtest_io_wfname, 'r'), 'r')
+  assert_true io.eof?
+  io.close
+
+  # nonempty file
+  io = IO.new(IO.sysopen($mrbtest_io_rfname))
+  assert_false io.eof?
+  io.readchar
+  assert_false io.eof?
+  io.read
+  assert_true io.eof?
+  io.close
+
+  true
+end
+
+assert('IO#flush', '15.2.20.5.7') do
+  # Note: mruby-io does not have any buffer to be flushed now.
+  io = IO.new(IO.sysopen($mrbtest_io_wfname))
+  assert_equal io, io.flush
+  io.close
+  assert_raise(IOError) do
+    io.flush
+  end
+end
+
+assert('IO#getc', '15.2.20.5.8') do
+  io = IO.new(IO.sysopen($mrbtest_io_rfname))
+  $mrbtest_io_msg.each_char { |ch|
+    assert_equal ch, io.getc
+  }
+  assert_equal nil, io.getc
+  io.close
+  true
+end
+
+#assert('IO#gets', '15.2.20.5.9') do
+#assert('IO#initialize_copy', '15.2.20.5.10') do
+#assert('IO#print', '15.2.20.5.11') do
+#assert('IO#putc', '15.2.20.5.12') do
+#assert('IO#puts', '15.2.20.5.13') do
+
+assert('IO#read', '15.2.20.5.14') do
+  IO.open(IO.sysopen($mrbtest_io_rfname)) do |io|
+    assert_raise(ArgumentError) { io.read(-5) }
+    assert_raise(TypeError) { io.read("str") }
+
+    len = $mrbtest_io_msg.length
+    assert_equal '', io.read(0)
+    assert_equal 'mruby', io.read(5)
+    assert_equal $mrbtest_io_msg[5,len], io.read(len)
+
+    assert_equal "", io.read
+    assert_nil io.read(1)
+  end
+
+  IO.open(IO.sysopen($mrbtest_io_rfname)) do |io|
+    assert_equal $mrbtest_io_msg, io.read
+  end
+end
+
+assert "IO#read(n) with n > IO::BUF_SIZE" do
+  r,w = IO.pipe
+  n = IO::BUF_SIZE+1
+  w.write 'a'*n
+  assert_equal r.read(n), 'a'*n
+end
+
+assert('IO#readchar', '15.2.20.5.15') do
+  # almost same as IO#getc
+  IO.open(IO.sysopen($mrbtest_io_rfname)) do |io|
+    $mrbtest_io_msg.each_char { |ch|
+      assert_equal ch, io.readchar
+    }
+    assert_raise(EOFError) do
+      io.readchar
+    end
+  end
+end
+
+#assert('IO#readline', '15.2.20.5.16') do
+#assert('IO#readlines', '15.2.20.5.17') do
+
+assert('IO#sync', '15.2.20.5.18') do
+  io = IO.new(IO.sysopen($mrbtest_io_rfname))
+  s = io.sync
+  assert_true(s == true || s == false)
+  io.close
+  assert_raise(IOError) do
+    io.sync
+  end
+end
+
+assert('IO#sync=', '15.2.20.5.19') do
+  io = IO.new(IO.sysopen($mrbtest_io_rfname))
+  io.sync = true
+  assert_true io.sync
+  io.sync = false
+  assert_false io.sync
+  io.close
+  assert_raise(IOError) do
+    io.sync = true
+  end
+end
+
+assert('IO#write', '15.2.20.5.20') do
+  io = IO.open(IO.sysopen($mrbtest_io_wfname))
+  assert_equal 0, io.write("")
+  io.close
+
+  io = IO.open(IO.sysopen($mrbtest_io_wfname, "r+"), "r+")
+  assert_equal 7, io.write("abcdefg")
+  io.rewind
+  assert_equal "ab", io.read(2)
+  assert_equal 3, io.write("123")
+  io.rewind
+  assert_equal "ab123fg", io.read
+  io.close
+
+  true
+end
+
+assert('IO#<<') do
+  io = IO.open(IO.sysopen($mrbtest_io_wfname))
+  io << "" << ""
+  assert_equal 0, io.pos
+  io.close
+  true
+end
+
+assert('IO.for_fd') do
+  fd = IO.sysopen($mrbtest_io_rfname)
+  io = IO.for_fd(fd)
+    assert_equal $mrbtest_io_msg, io.read
+  io.close
+  true
+end
+
+assert('IO.new') do
+  io = IO.new(0)
+  io.close
+  true
+end
+
+assert('IO gc check') do
+  100.times { IO.new(0) }
+end
+
+assert('IO.sysopen("./nonexistent")') do
+  if Object.const_defined? :Errno
+    eclass = Errno::ENOENT
+  else
+    eclass = RuntimeError
+  end
+  assert_raise eclass do
+    fd = IO.sysopen "./nonexistent"
+    IO._sysclose fd
+  end
+end
+
+assert('IO.sysopen, IO#sysread') do
+  fd = IO.sysopen $mrbtest_io_rfname
+  io = IO.new fd
+  str1 = "     "
+  str2 = io.sysread(5, str1)
+  assert_equal $mrbtest_io_msg[0,5], str1
+  assert_equal $mrbtest_io_msg[0,5], str2
+  assert_raise EOFError do
+    io.sysread(10000)
+    io.sysread(10000)
+  end
+
+  assert_raise RuntimeError do
+    io.sysread(5, "abcde".freeze)
+  end
+
+  io.close
+  assert_equal "", io.sysread(0)
+  assert_raise(IOError) { io.sysread(1) }
+  assert_raise(ArgumentError) { io.sysread(-1) }
+  io.closed?
+
+  fd = IO.sysopen $mrbtest_io_wfname, "w"
+  io = IO.new fd, "w"
+  assert_raise(IOError) { io.sysread(1) }
+  io.close
+  true
+end
+
+assert('IO.sysopen, IO#syswrite') do
+  fd = IO.sysopen $mrbtest_io_wfname, "w"
+  io = IO.new fd, "w"
+  str = "abcdefg"
+  len = io.syswrite(str)
+  assert_equal str.size, len
+  io.close
+
+  io = IO.new(IO.sysopen($mrbtest_io_rfname), "r")
+  assert_raise(IOError) { io.syswrite("a") }
+  io.close
+
+  true
+end
+
+assert('IO#_read_buf') do
+  fd = IO.sysopen $mrbtest_io_rfname
+  io = IO.new fd
+  def io._buf
+    @buf
+  end
+  msg_len = $mrbtest_io_msg.size
+  assert_equal '', io._buf
+  assert_equal $mrbtest_io_msg, io._read_buf
+  assert_equal $mrbtest_io_msg, io._buf
+  assert_equal 'mruby', io.read(5)
+  assert_equal 5, io.pos
+  assert_equal msg_len - 5, io._buf.size
+  assert_equal $mrbtest_io_msg[5,100], io.read
+  assert_equal 0, io._buf.size
+  assert_raise EOFError do
+    io._read_buf
+  end
+  assert_equal true, io.eof
+  assert_equal true, io.eof?
+  io.close
+  io.closed?
+end
+
+assert('IO#isatty') do
+  f1 = File.open("/dev/tty")
+  f2 = File.open($mrbtest_io_rfname)
+
+  assert_true  f1.isatty
+  assert_false f2.isatty
+
+  f1.close
+  f2.close
+  true
+end
+
+assert('IO#pos=, IO#seek') do
+  fd = IO.sysopen $mrbtest_io_rfname
+  io = IO.new fd
+  def io._buf
+    @buf
+  end
+  assert_equal 'm', io.getc
+  assert_equal 1, io.pos
+  assert_equal 0, io.seek(0)
+  assert_equal 0, io.pos
+  io.close
+  io.closed?
+end
+
+assert('IO#rewind') do
+  fd = IO.sysopen $mrbtest_io_rfname
+  io = IO.new fd
+  assert_equal 'm', io.getc
+  assert_equal 1, io.pos
+  assert_equal 0, io.rewind
+  assert_equal 0, io.pos
+  io.close
+  io.closed?
+end
+
+assert('IO#gets') do
+  fd = IO.sysopen $mrbtest_io_rfname
+  io = IO.new fd
+
+  # gets without arguments
+  assert_equal $mrbtest_io_msg, io.gets, "gets without arguments"
+  assert_equal nil, io.gets, "gets returns nil, when EOF"
+
+  # gets with limit
+  io.pos = 0
+  assert_equal $mrbtest_io_msg[0, 5], io.gets(5), "gets with limit"
+
+  # gets with rs
+  io.pos = 0
+  assert_equal $mrbtest_io_msg[0, 6], io.gets(' '), "gets with rs"
+
+  # gets with rs, limit
+  io.pos = 0
+  assert_equal $mrbtest_io_msg[0, 5], io.gets(' ', 5), "gets with rs, limit"
+  io.close
+  assert_equal true, io.closed?, "close success"
+
+  # reading many-lines file.
+  fd = IO.sysopen $mrbtest_io_wfname, "w"
+  io = IO.new fd, "w"
+  io.write "0123456789" * 2 + "\na"
+  assert_equal 22, io.pos
+  io.close
+  assert_equal true, io.closed?
+
+  fd = IO.sysopen $mrbtest_io_wfname
+  io = IO.new fd
+  line = io.gets
+
+  # gets first line
+  assert_equal "0123456789" * 2 + "\n", line, "gets first line"
+  assert_equal 21, line.size
+  assert_equal 21, io.pos
+
+  # gets second line
+  assert_equal "a", io.gets, "gets second line"
+
+  # gets third line
+  assert_equal nil, io.gets, "gets third line; returns nil"
+
+  io.close
+  io.closed?
+end
+
+assert('IO#gets - paragraph mode') do
+  fd = IO.sysopen $mrbtest_io_wfname, "w"
+  io = IO.new fd, "w"
+  io.write "0" * 10 + "\n"
+  io.write "1" * 10 + "\n\n"
+  io.write "2" * 10 + "\n"
+  assert_equal 34, io.pos
+  io.close
+  assert_equal true, io.closed?
+
+  fd = IO.sysopen $mrbtest_io_wfname
+  io = IO.new fd
+  para1 = "#{'0' * 10}\n#{'1' * 10}\n\n"
+  text1 = io.gets("")
+  assert_equal para1, text1
+  para2 = "#{'2' * 10}\n"
+  text2 = io.gets("")
+  assert_equal para2, text2
+  io.close
+  io.closed?
+end
+
+assert('IO.popen') do
+  begin
+    $? = nil
+    io = IO.popen("echo mruby-io")
+    assert_true io.close_on_exec?
+    assert_equal Fixnum, io.pid.class
+
+    out = io.read
+    assert_equal out.class, String
+    assert_include out, 'mruby-io'
+
+    io.close
+    if Object.const_defined? :Process
+      assert_true $?.success?
+    else
+      assert_equal 0, $?
+    end
+
+    assert_true io.closed?
+  rescue NotImplementedError => e
+    skip e.message
+  end
+end
+
+assert('IO.popen with in option') do
+  begin
+    IO.pipe do |r, w|
+      w.write 'hello'
+      w.close
+      assert_equal "hello", IO.popen("cat", "r", in: r) { |i| i.read }
+      assert_equal "", r.read
+    end
+    assert_raise(ArgumentError) { IO.popen("hello", "r", in: Object.new) }
+  rescue NotImplementedError => e
+    skip e.message
+  end
+end
+
+assert('IO.popen with out option') do
+  begin
+    IO.pipe do |r, w|
+      IO.popen("echo 'hello'", "w", out: w) {}
+      w.close
+      assert_equal "hello\n", r.read
+    end
+  rescue NotImplementedError => e
+    skip e.message
+  end
+end
+
+assert('IO.popen with err option') do
+  begin
+    IO.pipe do |r, w|
+      assert_equal "", IO.popen("echo 'hello' 1>&2", "r", err: w) { |i| i.read }
+      w.close
+      assert_equal "hello\n", r.read
+    end
+  rescue NotImplementedError => e
+    skip e.message
+  end
+end
+
+assert('IO.read') do
+  # empty file
+  fd = IO.sysopen $mrbtest_io_wfname, "w"
+  io = IO.new fd, "w"
+  io.close
+  assert_equal "",  IO.read($mrbtest_io_wfname)
+  assert_equal nil, IO.read($mrbtest_io_wfname, 1)
+
+  # one byte file
+  fd = IO.sysopen $mrbtest_io_wfname, "w"
+  io = IO.new fd, "w"
+  io.write "123"
+  io.close
+  assert_equal "123", IO.read($mrbtest_io_wfname)
+  assert_equal "",    IO.read($mrbtest_io_wfname, 0)
+  assert_equal "1",   IO.read($mrbtest_io_wfname, 1)
+  assert_equal "",    IO.read($mrbtest_io_wfname, 0, 10)
+  assert_equal "23",  IO.read($mrbtest_io_wfname, 2, 1)
+  assert_equal "23",  IO.read($mrbtest_io_wfname, 10, 1)
+  assert_equal "",    IO.read($mrbtest_io_wfname, nil, 10)
+  assert_equal nil,   IO.read($mrbtest_io_wfname, 1, 10)
+end
+
+assert('IO#fileno') do
+  fd = IO.sysopen $mrbtest_io_rfname
+  io = IO.new fd
+  assert_equal io.fileno, fd
+  assert_equal io.to_i, fd
+  io.close
+  io.closed?
+end
+
+assert('IO#close_on_exec') do
+  fd = IO.sysopen $mrbtest_io_wfname, "w"
+  io = IO.new fd, "w"
+  begin
+    # IO.sysopen opens a file descripter with O_CLOEXEC flag.
+    assert_true io.close_on_exec?
+  rescue ScriptError
+    skip "IO\#close_on_exec is not implemented."
+  end
+
+  io.close_on_exec = false
+  assert_equal(false, io.close_on_exec?)
+  io.close_on_exec = true
+  assert_equal(true, io.close_on_exec?)
+  io.close_on_exec = false
+  assert_equal(false, io.close_on_exec?)
+
+  io.close
+  io.closed?
+
+  begin
+    r, w = IO.pipe
+    assert_equal(true, r.close_on_exec?)
+    r.close_on_exec = false
+    assert_equal(false, r.close_on_exec?)
+    r.close_on_exec = true
+    assert_equal(true, r.close_on_exec?)
+
+    assert_equal(true, w.close_on_exec?)
+    w.close_on_exec = false
+    assert_equal(false, w.close_on_exec?)
+    w.close_on_exec = true
+    assert_equal(true, w.close_on_exec?)
+  ensure
+    r.close unless r.closed?
+    w.close unless w.closed?
+  end
+end
+
+assert('IO#sysseek') do
+  IO.open(IO.sysopen($mrbtest_io_rfname)) do |io|
+    assert_equal 2, io.sysseek(2)
+    assert_equal 5, io.sysseek(3, IO::SEEK_CUR) # 2 + 3 => 5
+    assert_equal $mrbtest_io_msg.size - 4, io.sysseek(-4, IO::SEEK_END)
+  end
+end
+
+assert('IO.pipe') do
+  begin
+    called = false
+    IO.pipe do |r, w|
+      assert_true r.kind_of?(IO)
+      assert_true w.kind_of?(IO)
+      assert_false r.closed?
+      assert_false w.closed?
+      assert_true FileTest.pipe?(r)
+      assert_true FileTest.pipe?(w)
+      assert_nil r.pid
+      assert_nil w.pid
+      assert_true 2 < r.fileno
+      assert_true 2 < w.fileno
+      assert_true r.fileno != w.fileno
+      assert_false r.sync
+      assert_true w.sync
+      assert_equal 8, w.write('test for')
+      assert_equal 'test', r.read(4)
+      assert_equal ' for', r.read(4)
+      assert_equal 5, w.write(' pipe')
+      assert_equal nil, w.close
+      assert_equal ' pipe', r.read
+      called = true
+      assert_raise(IOError) { r.write 'test' }
+      # TODO:
+      # This assert expect raise IOError but got RuntimeError
+      # Because mruby-io not have flag for I/O readable
+      # assert_raise(IOError) { w.read }
+    end
+    assert_true called
+
+    assert_nothing_raised do
+      IO.pipe { |r, w| r.close; w.close }
+    end
+  rescue NotImplementedError => e
+    skip e.message
+  end
+end
+
+assert('`cmd`') do
+  begin
+    assert_equal `echo foo`, "foo\n"
+  rescue NotImplementedError => e
+    skip e.message
+  end
+end
+
+assert('IO TEST CLEANUP') do
+  assert_nil MRubyIOTestUtil.io_test_cleanup
+end
diff --git a/mrbgems/mruby-io/test/mruby_io_test.c b/mrbgems/mruby-io/test/mruby_io_test.c
new file mode 100644
index 000000000..ffaa27ff4
--- /dev/null
+++ b/mrbgems/mruby-io/test/mruby_io_test.c
@@ -0,0 +1,191 @@
+#include <sys/types.h>
+#include <errno.h>
+
+#if defined(_WIN32) || defined(_WIN64)
+  #include <winsock.h>
+  #include <io.h>
+#else
+  #include <sys/socket.h>
+  #include <unistd.h>
+  #include <sys/un.h>
+#endif
+
+#include <sys/stat.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "mruby.h"
+#include "mruby/array.h"
+#include "mruby/error.h"
+#include "mruby/string.h"
+#include "mruby/variable.h"
+
+static mrb_value
+mrb_io_test_io_setup(mrb_state *mrb, mrb_value self)
+{
+  char rfname[]      = "tmp.mruby-io-test.XXXXXXXX";
+  char wfname[]      = "tmp.mruby-io-test.XXXXXXXX";
+  char symlinkname[] = "tmp.mruby-io-test.XXXXXXXX";
+  char socketname[]  = "/tmp/mruby-io-test.XXXXXXXX";
+  char msg[] = "mruby io test\n";
+  mode_t mask;
+  int fd0, fd1, fd2, fd3;
+  FILE *fp;
+
+#ifndef _WIN32
+  struct sockaddr_un sun0;
+#endif
+
+  mask = umask(077);
+  fd0 = mkstemp(rfname);
+  fd1 = mkstemp(wfname);
+#ifndef _WIN32
+  fd2 = mkstemp(symlinkname);
+  fd3 = mkstemp(socketname);
+#endif
+  if (fd0 == -1 || fd1 == -1 || fd2 == -1 || fd3 == -1) {
+    mrb_raise(mrb, E_RUNTIME_ERROR, "can't create temporary file");
+    return mrb_nil_value();
+  }
+  umask(mask);
+
+  mrb_gv_set(mrb, mrb_intern_cstr(mrb, "$mrbtest_io_rfname"), mrb_str_new_cstr(mrb, rfname));
+  mrb_gv_set(mrb, mrb_intern_cstr(mrb, "$mrbtest_io_wfname"), mrb_str_new_cstr(mrb, wfname));
+  mrb_gv_set(mrb, mrb_intern_cstr(mrb, "$mrbtest_io_symlinkname"), mrb_str_new_cstr(mrb, symlinkname));
+  mrb_gv_set(mrb, mrb_intern_cstr(mrb, "$mrbtest_io_socketname"), mrb_str_new_cstr(mrb, socketname));
+  mrb_gv_set(mrb, mrb_intern_cstr(mrb, "$mrbtest_io_msg"), mrb_str_new_cstr(mrb, msg));
+
+  fp = fopen(rfname, "wb");
+  if (fp == NULL) {
+    mrb_raise(mrb, E_RUNTIME_ERROR, "can't open temporary file");
+    return mrb_nil_value();
+  }
+  fputs(msg, fp);
+  fclose(fp);
+
+  fp = fopen(wfname, "wb");
+  if (fp == NULL) {
+    mrb_raise(mrb, E_RUNTIME_ERROR, "can't open temporary file");
+    return mrb_nil_value();
+  }
+  fclose(fp);
+
+#ifndef _WIN32
+  unlink(symlinkname);
+  close(fd2);
+  if (symlink(rfname, symlinkname) == -1) {
+    mrb_raise(mrb, E_RUNTIME_ERROR, "can't make a symbolic link");
+  }
+
+  unlink(socketname);
+  close(fd3);
+  fd3 = socket(AF_UNIX, SOCK_STREAM, 0);
+  if (fd3 == -1) {
+    mrb_raise(mrb, E_RUNTIME_ERROR, "can't make a socket");
+  }
+  sun0.sun_family = AF_UNIX;
+  snprintf(sun0.sun_path, sizeof(sun0.sun_path), "%s", socketname);
+  if (bind(fd3, (struct sockaddr *)&sun0, sizeof(sun0)) == -1) {
+    mrb_raisef(mrb, E_RUNTIME_ERROR, "can't bind AF_UNIX socket to %S: %S",
+               mrb_str_new_cstr(mrb, sun0.sun_path),
+               mrb_fixnum_value(errno));
+  }
+  close(fd3);
+#endif
+
+  return mrb_true_value();
+}
+
+static mrb_value
+mrb_io_test_io_cleanup(mrb_state *mrb, mrb_value self)
+{
+  mrb_value rfname = mrb_gv_get(mrb, mrb_intern_cstr(mrb, "$mrbtest_io_rfname"));
+  mrb_value wfname = mrb_gv_get(mrb, mrb_intern_cstr(mrb, "$mrbtest_io_wfname"));
+  mrb_value symlinkname = mrb_gv_get(mrb, mrb_intern_cstr(mrb, "$mrbtest_io_symlinkname"));
+  mrb_value socketname = mrb_gv_get(mrb, mrb_intern_cstr(mrb, "$mrbtest_io_socketname"));
+
+  if (mrb_type(rfname) == MRB_TT_STRING) {
+    remove(RSTRING_PTR(rfname));
+  }
+  if (mrb_type(wfname) == MRB_TT_STRING) {
+    remove(RSTRING_PTR(wfname));
+  }
+  if (mrb_type(symlinkname) == MRB_TT_STRING) {
+    remove(RSTRING_PTR(symlinkname));
+  }
+  if (mrb_type(socketname) == MRB_TT_STRING) {
+    remove(RSTRING_PTR(socketname));
+  }
+
+  mrb_gv_set(mrb, mrb_intern_cstr(mrb, "$mrbtest_io_rfname"), mrb_nil_value());
+  mrb_gv_set(mrb, mrb_intern_cstr(mrb, "$mrbtest_io_wfname"), mrb_nil_value());
+  mrb_gv_set(mrb, mrb_intern_cstr(mrb, "$mrbtest_io_symlinkname"), mrb_nil_value());
+  mrb_gv_set(mrb, mrb_intern_cstr(mrb, "$mrbtest_io_socketname"), mrb_nil_value());
+  mrb_gv_set(mrb, mrb_intern_cstr(mrb, "$mrbtest_io_msg"), mrb_nil_value());
+
+  return mrb_nil_value();
+}
+
+static mrb_value
+mrb_io_test_file_setup(mrb_state *mrb, mrb_value self)
+{
+  mrb_value ary = mrb_io_test_io_setup(mrb, self);
+#ifndef _WIN32
+  if (symlink("/usr/bin", "test-bin") == -1) {
+    mrb_raise(mrb, E_RUNTIME_ERROR, "can't make a symbolic link");
+  }
+#endif
+
+  return ary;
+}
+
+static mrb_value
+mrb_io_test_file_cleanup(mrb_state *mrb, mrb_value self)
+{
+  mrb_io_test_io_cleanup(mrb, self);
+  remove("test-bin");
+
+  return mrb_nil_value();
+}
+
+static mrb_value
+mrb_io_test_mkdtemp(mrb_state *mrb, mrb_value klass)
+{
+  mrb_value str;
+  char *cp;
+
+  mrb_get_args(mrb, "S", &str);
+  cp = mrb_str_to_cstr(mrb, str);
+  if (mkdtemp(cp) == NULL) {
+    mrb_sys_fail(mrb, "mkdtemp");
+  }
+  return mrb_str_new_cstr(mrb, cp);
+}
+
+static mrb_value
+mrb_io_test_rmdir(mrb_state *mrb, mrb_value klass)
+{
+  mrb_value str;
+  char *cp;
+
+  mrb_get_args(mrb, "S", &str);
+  cp = mrb_str_to_cstr(mrb, str);
+  if (rmdir(cp) == -1) {
+    mrb_sys_fail(mrb, "rmdir");
+  }
+  return mrb_true_value();
+}
+
+void
+mrb_mruby_io_gem_test(mrb_state* mrb)
+{
+  struct RClass *io_test = mrb_define_module(mrb, "MRubyIOTestUtil");
+  mrb_define_class_method(mrb, io_test, "io_test_setup", mrb_io_test_io_setup, MRB_ARGS_NONE());
+  mrb_define_class_method(mrb, io_test, "io_test_cleanup", mrb_io_test_io_cleanup, MRB_ARGS_NONE());
+
+  mrb_define_class_method(mrb, io_test, "file_test_setup", mrb_io_test_file_setup, MRB_ARGS_NONE());
+  mrb_define_class_method(mrb, io_test, "file_test_cleanup", mrb_io_test_file_cleanup, MRB_ARGS_NONE());
+
+  mrb_define_class_method(mrb, io_test, "mkdtemp", mrb_io_test_mkdtemp, MRB_ARGS_REQ(1));
+  mrb_define_class_method(mrb, io_test, "rmdir", mrb_io_test_rmdir, MRB_ARGS_REQ(1));
+}