add a test.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@15239 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 0 deletions

diff --git a/test/ruby/test_io_m17n.rb b/test/ruby/test_io_m17n.rb
index 2e52c8bb3e..dc10d1d29c 100644
--- a/test/ruby/test_io_m17n.rb
+++ b/test/ruby/test_io_m17n.rb
@@ -417,5 +417,14 @@ EOT
       assert_equal(data, result)
     }
   end
+
+  def test_gets_nil
+    with_pipe("UTF-8:EUC-JP") {|r, w|
+      w << "\u{3042}"
+      w.close
+      result = r.gets(nil)
+      assert_equal("\u{3042}".encode("euc-jp"), result)
+    }
+  end
 end