From 07f53e483042f8d154912b9414808ad40973cd44 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 18 Dec 2015 03:05:53 +0000
Subject: [PATCH] test_stringio.rb: add test

* test/stringio/test_stringio.rb (test_ungetc_pos): add a test for
  r26588.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53180 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/stringio/test_stringio.rb | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/test/stringio/test_stringio.rb b/test/stringio/test_stringio.rb
index 17ae9ab848..af6efc684e 100644
--- a/test/stringio/test_stringio.rb
+++ b/test/stringio/test_stringio.rb
@@ -572,6 +572,16 @@ class TestStringIO < Test::Unit::TestCase
     end
   end
 
+  def test_ungetc_padding
+    s = StringIO.new()
+    s.pos = 2
+    s.ungetc("a")
+    assert_equal("\0""a", s.string)
+    s.pos = 0
+    s.ungetc("b")
+    assert_equal("b""\0""a", s.string)
+  end
+
   def test_frozen
     s = StringIO.new
     s.freeze