* ext/stringio/stringio.c (strio_ungetbyte): encoding should not

  be effective.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@23424 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 15 insertions, 0 deletions

diff --git a/test/stringio/test_stringio.rb b/test/stringio/test_stringio.rb
index 33bef0690b..8c72803b45 100644
--- a/test/stringio/test_stringio.rb
+++ b/test/stringio/test_stringio.rb
@@ -289,6 +289,21 @@ class TestStringIO < Test::Unit::TestCase
     f.close unless f.closed?
   end
 
+  def test_ungetbyte
+    s = "foo\nbar\n"
+    t = StringIO.new(s, "r")
+    t.ungetbyte(0x41)
+    assert_equal(0x41, t.getbyte)
+    t.ungetbyte("qux")
+    assert_equal("quxfoo\n", t.gets)
+    t.set_encoding("utf-8")
+    t.ungetbyte(0x89)
+    t.ungetbyte(0x8e)
+    t.ungetbyte("\xe7")
+    t.ungetbyte("\xe7\xb4\x85")
+    assert_equal("\u7d05\u7389bar\n", t.gets)
+  end
+
   def test_ungetc
     s = "1234"
     f = StringIO.new(s, "r")