1 files changed, 15 insertions, 0 deletions
diff --git a/test/ruby/test_io_m17n.rb b/test/ruby/test_io_m17n.rb
index 8c71c2c871..b6c6215371 100644
--- a/test/ruby/test_io_m17n.rb
+++ b/test/ruby/test_io_m17n.rb
@@ -2415,4 +2415,19 @@ EOT
     }
     assert_equal(paths.map(&:encoding), encs, bug6072)
   end
+
+  def test_pos_dont_move_cursor_position
+    bug6179 = '[ruby-core:43497]'
+    with_tmpdir {
+      str = "line one\r\nline two\r\nline three\r\n"
+      generate_file("tmp", str)
+      open("tmp", "r") do |f|
+        assert_equal("line one\n", f.readline)
+        assert_equal(10, f.pos, bug6179)
+        assert_equal("line two\n", f.readline, bug6179)
+        assert_equal(20, f.pos, bug6179)
+        assert_equal("line three\n", f.readline, bug6179)
+      end
+    }
+  end if /mswin|mingw/ =~ RUBY_PLATFORM
 end