1 files changed, 14 insertions, 0 deletions
diff --git a/test/psych/test_stringio.rb b/test/psych/test_stringio.rb
new file mode 100644
index 0000000000..7fef1402a0
--- /dev/null
+++ b/test/psych/test_stringio.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+require_relative 'helper'
+
+module Psych
+  class TestStringIO < TestCase
+    # The superclass of StringIO before Ruby 3.0 was `Data`,
+    # which can interfere with the Ruby 3.2+ `Data` dumping.
+    def test_stringio
+      assert_nothing_raised do
+        Psych.dump(StringIO.new("foo"))
+      end
+    end
+  end
+end