1 files changed, 6 insertions, 0 deletions
diff --git a/test/ruby/test_argf.rb b/test/ruby/test_argf.rb
index bc5c67d0d8..a112cf3e84 100644
--- a/test/ruby/test_argf.rb
+++ b/test/ruby/test_argf.rb
@@ -310,6 +310,12 @@ class TestArgf < Test::Unit::TestCase
     };
   end
 
+  def test_inplace_invalid_backup
+    assert_raise(ArgumentError, '[ruby-dev:50272] [Bug #13960]') {
+      ARGF.inplace_mode = "a\0"
+    }
+  end
+
   def test_encoding
     ruby('-e', "#{<<~"{#"}\n#{<<~'};'}", @t1.path, @t2.path, @t3.path) do |f|
       {#