https://git.ruby-lang.org/ruby.git/commit/?id=0971cab4d0

From 0971cab4d0cb730292461d16ac72c430aa23cc10 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 17 May 2019 09:53:47 +0900
Subject: Test to disable ASCII-only optimization

Examples why ASCII-only optimization cannot apply multi-byte
encodings which have 7-bit trailing bytes.

Suggested by @duerst at https://github.com/ruby/ruby/pull/2187#issuecomment-492949218

diff --git a/test/ruby/enc/test_case_mapping.rb b/test/ruby/enc/test_case_mapping.rb
index aa20531..31acdc4 100644
--- a/test/ruby/enc/test_case_mapping.rb
+++ b/test/ruby/enc/test_case_mapping.rb
@@ -210,6 +210,16 @@ class TestCaseMappingPreliminary < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/enc/test_case_mapping.rb#L210
     assert_equal "\u10D0\u10D1\u10D2", "\u10D0\u10D1\u10D2".capitalize
   end
 
+  def test_shift_jis_downcase_ascii
+    s = ("A".."Z").map {|c| "\x89#{c}"}.join("").force_encoding("Shift_JIS")
+    assert_equal s, s.downcase(:ascii)
+  end
+
+  def test_shift_jis_upcase_ascii
+    s = ("a".."z").map {|c| "\x89#{c}"}.join("").force_encoding("Shift_JIS")
+    assert_equal s, s.upcase(:ascii)
+  end
+
   def no_longer_a_test_buffer_allocations
     assert_equal 'TURKISH*脹'*10, ('I'*10).downcase(:turkic)
     assert_equal 'TURKISH*脹'*100, ('I'*100).downcase(:turkic)
-- 
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