1 files changed, 7 insertions, 0 deletions
diff --git a/test/json/json_generator_test.rb b/test/json/json_generator_test.rb
index afe436b20d..d09c6479fa 100755
--- a/test/json/json_generator_test.rb
+++ b/test/json/json_generator_test.rb
@@ -438,6 +438,13 @@ EOT
     end
   end
 
+  def test_invalid_encoding_string
+    error = assert_raise(JSON::GeneratorError) do
+      "\x82\xAC\xEF".to_json
+    end
+    assert_includes error.message, "source sequence is illegal/malformed utf-8"
+  end
+
   if defined?(JSON::Ext::Generator) and RUBY_PLATFORM != "java"
     def test_string_ext_included_calls_super
       included = false