1 files changed, 16 insertions, 0 deletions
diff --git a/test/stringio/test_stringio.rb b/test/stringio/test_stringio.rb
index a62fa491b8..cdb35e6acc 100644
--- a/test/stringio/test_stringio.rb
+++ b/test/stringio/test_stringio.rb
@@ -14,4 +14,20 @@ class TestStringIO < Test::Unit::TestCase
   alias open_file_rw open_file
 
   include TestEOF::Seek
+
+  def test_truncate # [ruby-dev:24190]
+    io = StringIO.new("")
+    io.puts "abc"
+    io.truncate(0)
+    io.puts "def"
+    assert_equal("\0\0\0def\n", io.string)
+  end
+
+  def test_seek_beyond_eof # [ruby-dev:24194]
+    io = StringIO.new
+    n = 100
+    io.seek(n)
+    io.print "last"
+    assert_equal("\0" * n + "last", io.string)
+  end
 end