}
	rb = bytes.NewBuffer(src)
	pr, pw := Pipe()
	pr.Close()
	r = TeeReader(rb, pw)
	if n, err := ReadFull(r, dst); n != 0 || err != ErrClosedPipe {
		t.Errorf("closed tee: ReadFull(r, dst) = %d, %v; want 0, EPIPE", n, err)
	}
}

func TestSectionReader_ReadAt(t *testing.T) {
	dat := "a long sample data, 1234567890"
	tests := []struct {
		data   string
		off    int
		n      int
		bufLen int
		at     int

	{27, "EFBIG", "file too large"},
	{28, "ENOSPC", "no space left on device"},
	{29, "ESPIPE", "illegal seek"},
	{30, "EROFS", "read-only file system"},
	{31, "EMLINK", "too many links"},
	{32, "EPIPE", "broken pipe"},
	{33, "EDOM", "numerical argument out of domain"},
	{34, "ERANGE", "numerical result out of range"},
	{36, "EINPROGRESS", "operation now in progress"},
	{37, "EALREADY", "operation already in progress"},

	{27, "EFBIG", "file too large"},
	{28, "ENOSPC", "no space left on device"},
	{29, "ESPIPE", "illegal seek"},
	{30, "EROFS", "read-only file system"},
	{31, "EMLINK", "too many links"},
	{32, "EPIPE", "broken pipe"},
	{33, "EDOM", "numerical argument out of domain"},
	{34, "ERANGE", "numerical result out of range"},
	{35, "EDEADLK", "resource deadlock avoided"},
	{36, "ENAMETOOLONG", "file name too long"},

	{27, "EFBIG", "file too large"},
	{28, "ENOSPC", "no space left on device"},
	{29, "ESPIPE", "illegal seek"},
	{30, "EROFS", "read-only file system"},
	{31, "EMLINK", "too many links"},
	{32, "EPIPE", "broken pipe"},
	{33, "EDOM", "numerical argument out of domain"},
	{34, "ERANGE", "numerical result out of range"},
	{35, "EDEADLK", "resource deadlock avoided"},
	{36, "ENAMETOOLONG", "file name too long"},

	{27, "EFBIG", "file too large"},
	{28, "ENOSPC", "no space left on device"},
	{29, "ESPIPE", "illegal seek"},
	{30, "EROFS", "read-only file system"},
	{31, "EMLINK", "too many links"},
	{32, "EPIPE", "broken pipe"},
	{33, "EDOM", "numerical argument out of domain"},
	{34, "ERANGE", "numerical result out of range"},
	{35, "EDEADLK", "resource deadlock avoided"},
	{36, "ENAMETOOLONG", "file name too long"},

	ENOSYS             = Errno(134)
	ENOTDIR            = Errno(135)
	ENOTEMPTY          = Errno(136)
	ENOTTY             = Errno(137)
	ENXIO              = Errno(138)
	EPERM              = Errno(139)
	EPIPE              = Errno(140)
	EROFS              = Errno(141)
	ESPIPE             = Errno(142)
	ESRCH              = Errno(143)
	EXDEV              = Errno(144)
	E2BIG              = Errno(145)

	ENXIO           = Errno(0x6)
	EOPNOTSUPP      = Errno(0x7a)
	EOVERFLOW       = Errno(0x4f)
	EOWNERDEAD      = Errno(0x3a)
	EPERM           = Errno(0x1)
	EPFNOSUPPORT    = Errno(0x7b)
	EPIPE           = Errno(0x20)
	EPROTO          = Errno(0x47)
	EPROTONOSUPPORT = Errno(0x78)
	EPROTOTYPE      = Errno(0x62)
	ERANGE          = Errno(0x22)
	EREMCHG         = Errno(0x52)
	EREMOTE         = Errno(0x42)

	ENXIO           = Errno(0x6)
	EOPNOTSUPP      = Errno(0x5f)
	EOVERFLOW       = Errno(0x4b)
	EOWNERDEAD      = Errno(0x82)
	EPERM           = Errno(0x1)
	EPFNOSUPPORT    = Errno(0x60)
	EPIPE           = Errno(0x20)
	EPROTO          = Errno(0x47)
	EPROTONOSUPPORT = Errno(0x5d)
	EPROTOTYPE      = Errno(0x5b)
	ERANGE          = Errno(0x22)
	EREMCHG         = Errno(0x4e)
	EREMOTE         = Errno(0x42)

	ENXIO           = Errno(0x6)
	EOPNOTSUPP      = Errno(0x2d)
	EOVERFLOW       = Errno(0x54)
	EOWNERDEAD      = Errno(0x60)
	EPERM           = Errno(0x1)
	EPFNOSUPPORT    = Errno(0x2e)
	EPIPE           = Errno(0x20)
	EPROCLIM        = Errno(0x43)
	EPROCUNAVAIL    = Errno(0x4c)
	EPROGMISMATCH   = Errno(0x4b)
	EPROGUNAVAIL    = Errno(0x4a)
	EPROTO          = Errno(0x5c)
	EPROTONOSUPPORT = Errno(0x2b)

	ENXIO           = Errno(0x6)
	EOPNOTSUPP      = Errno(0x5f)
	EOVERFLOW       = Errno(0x4b)
	EOWNERDEAD      = Errno(0x82)
	EPERM           = Errno(0x1)
	EPFNOSUPPORT    = Errno(0x60)
	EPIPE           = Errno(0x20)
	EPROTO          = Errno(0x47)
	EPROTONOSUPPORT = Errno(0x5d)
	EPROTOTYPE      = Errno(0x5b)
	ERANGE          = Errno(0x22)
	EREMCHG         = Errno(0x4e)
	EREMOTE         = Errno(0x42)