1 files changed, 5 insertions, 1 deletions
diff --git a/test/webrick/test_htmlutils.rb b/test/webrick/test_htmlutils.rb
index 987bc229c9..1fe49ee226 100644
--- a/test/webrick/test_htmlutils.rb
+++ b/test/webrick/test_htmlutils.rb
@@ -11,6 +11,10 @@ class TestWEBrickHTMLUtils < Test::Unit::TestCase
     assert_equal("foo&quot;bar", escape("foo\"bar"))
     assert_equal("foo&gt;bar", escape("foo>bar"))
     assert_equal("foo&lt;bar", escape("foo<bar"))
-    assert_equal("こんにちは", escape("こんにちは"))
+    assert_equal("\u{3053 3093 306B 3061 306F}", escape("\u{3053 3093 306B 3061 306F}"))
+    bug8425 = '[Bug #8425] [ruby-core:55052]'
+    assert_nothing_raised(ArgumentError, Encoding::CompatibilityError, bug8425) {
+      assert_equal("\u{3053 3093 306B}\xff&lt;", escape("\u{3053 3093 306B}\xff<"))
+    }
   end
 end