From ee29aade1a432cbd5e4d5ec6ea6ccb4fa87361be Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Thu, 7 Nov 2024 21:03:37 +0900
Subject: [Bug #20869] Discard read buffer and encoding converters at seeking

---
 test/ruby/test_io.rb | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'test')

diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index 5d4ede1e4f..0abc71a5b0 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -350,6 +350,19 @@ class TestIO < Test::Unit::TestCase
     end)
   end
 
+  def test_ungetc_with_seek
+    make_tempfile {|t|
+      t.open
+      t.write('0123456789')
+      t.rewind
+
+      t.ungetc('a')
+      t.seek(2, :SET)
+
+      assert_equal('2', t.getc)
+    }
+  end
+
   def test_ungetbyte
     make_tempfile {|t|
       t.open
@@ -373,6 +386,19 @@ class TestIO < Test::Unit::TestCase
     }
   end
 
+  def test_ungetbyte_with_seek
+    make_tempfile {|t|
+      t.open
+      t.write('0123456789')
+      t.rewind
+
+      t.ungetbyte('a'.ord)
+      t.seek(2, :SET)
+
+      assert_equal('2'.ord, t.getbyte)
+    }
+  end
+
   def test_each_byte
     pipe(proc do |w|
       w << "abc def"
-- 
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