1 files changed, 8 insertions, 0 deletions
diff --git a/test/ruby/test_m17n.rb b/test/ruby/test_m17n.rb
index bbaf31f52a..99450723cf 100644
--- a/test/ruby/test_m17n.rb
+++ b/test/ruby/test_m17n.rb
@@ -260,6 +260,14 @@ class TestM17N < Test::Unit::TestCase
     end
   end
 
+  def test_utf_without_bom_asciionly
+    bug10598 = '[ruby-core:66835] [Bug #10598]'
+    encs = [Encoding::UTF_16, Encoding::UTF_32].find_all {|enc|
+      "abcd".force_encoding(enc).ascii_only?
+    }
+    assert_empty(encs, bug10598)
+  end
+
   def test_object_utf16_32_inspect
     EnvUtil.suppress_warning do
       begin