1 files changed, 15 insertions, 0 deletions
diff --git a/test/json/json_ext_parser_test.rb b/test/json/json_ext_parser_test.rb
new file mode 100644
index 0000000000..c5a030ea8a
--- /dev/null
+++ b/test/json/json_ext_parser_test.rb
@@ -0,0 +1,15 @@
+#frozen_string_literal: false
+require 'test_helper'
+
+class JSONExtParserTest < Test::Unit::TestCase
+  if defined?(JSON::Ext::Parser)
+    def test_allocate
+      parser = JSON::Ext::Parser.new("{}")
+      assert_raise(TypeError, '[ruby-core:35079]') do
+        parser.__send__(:initialize, "{}")
+      end
+      parser = JSON::Ext::Parser.allocate
+      assert_raise(TypeError, '[ruby-core:35079]') { parser.source }
+    end
+  end
+end