1 files changed, 15 insertions, 0 deletions
diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index 3550162aa9..2fd4f77f40 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -1085,6 +1085,21 @@ class TestIO < Test::Unit::TestCase
     end
   end
 
+  def test_pos
+    t = make_tempfile
+
+    open(t.path, IO::RDWR|IO::CREAT|IO::TRUNC, 0600) do |f|
+      f.write "Hello"
+      assert_equal(5, f.pos)
+    end
+    open(t.path, IO::RDWR|IO::CREAT|IO::TRUNC, 0600) do |f|
+      f.sync = true
+      f.read
+      f.write "Hello"
+      assert_equal(5, f.pos)
+    end
+  end
+
   def test_sysseek
     t = make_tempfile