https://git.ruby-lang.org/ruby.git/commit/?id=c62aff1632

From c62aff16325c6b170f437f7ebe97c09387464ada Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 19 Jul 2020 11:38:58 +0900
Subject: [ruby/stringio] Added non-ASCII but convertible encoding case

https://github.com/ruby/stringio/commit/1d28e5c969

diff --git a/test/stringio/test_stringio.rb b/test/stringio/test_stringio.rb
index 3cf7f42..ab448f0 100644
--- a/test/stringio/test_stringio.rb
+++ b/test/stringio/test_stringio.rb
@@ -195,6 +195,9 @@ class TestStringIO < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/stringio/test_stringio.rb#L195
     s = StringIO.new.set_encoding(conversion_encoding)
     s.write(convertible)
     assert_equal(conversion_encoding, s.string.encoding)
+    s = StringIO.new.set_encoding(Encoding::UTF_8)
+    s.write("foo".force_encoding("ISO-8859-1"), convertible)
+    assert_equal(Encoding::UTF_8, s.string.encoding)
     all_assertions do |a|
       [
         inconvertible,
-- 
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