From 36045ea96fa499681a5773c1148a7ddc6715face Mon Sep 17 00:00:00 2001
From: Tomoyuki Sahara <tsahara@iij.ad.jp>
Date: Fri, 18 Apr 2014 11:20:55 +0900
Subject: IO#syswrite should raise an error if it's not opened for writing.

---
 test/io.rb | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'test')

diff --git a/test/io.rb b/test/io.rb
index 0db0e9e75..eb605ef31 100644
--- a/test/io.rb
+++ b/test/io.rb
@@ -92,7 +92,12 @@ assert('IO.sysopen, IO#syswrite') do
   len = io.syswrite(str)
   assert_equal str.size, len
   io.close
-  io.closed?
+
+  io = IO.new(IO.sysopen($mrbtest_io_rfname), "r")
+  assert_raise(IOError) { io.syswrite("a") }
+  io.close
+
+  true
 end
 
 assert('IO#_read_buf') do
-- 
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