https://git.ruby-lang.org/ruby.git/commit/?id=c38bc172be

From c38bc172bee99ff71440a1ebb4c38e6d092e0807 Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Sun, 8 Dec 2019 08:35:31 +0900
Subject: Fix encoding of completed list


diff --git a/test/readline/test_readline.rb b/test/readline/test_readline.rb
index 129adc7..3c1f74a 100644
--- a/test/readline/test_readline.rb
+++ b/test/readline/test_readline.rb
@@ -586,7 +586,9 @@ module BasetestReadline https://github.com/ruby/ruby/blob/trunk/test/readline/test_readline.rb#L586
         Readline.input = r
         Readline.output = null
         Readline.completion_proc = ->(text) do
-          ['abcde', 'abc12']
+          ['abcde', 'abc12'].map { |i|
+            i.encode(get_default_internal_encoding)
+          }
         end
         w.write("a\t\n")
         w.flush
@@ -597,6 +599,31 @@ module BasetestReadline https://github.com/ruby/ruby/blob/trunk/test/readline/test_readline.rb#L599
     assert_equal('abc', line)
   end
 
+  def test_completion_with_completion_append_character
+    skip "Reline doesn't still implement it" if defined?(Reline) and Readline == Reline
+    line = nil
+
+    append_character = Readline.completion_append_character
+    open(IO::NULL, 'w') do |null|
+      IO.pipe do |r, w|
+        Readline.input = r
+        Readline.output = null
+        Readline.completion_append_character = '!'
+        Readline.completion_proc = ->(text) do
+          ['abcde']
+        end
+        w.write("a\t\n")
+        w.flush
+        line = Readline.readline('> ', false)
+      end
+    end
+
+    assert_equal('abcde!', line)
+  ensure
+    return if defined?(Reline) and Readline == Reline
+    Readline.completion_append_character = append_character
+  end
+
   def test_completion_quote_character_completing_unquoted_argument
     return unless Readline.respond_to?(:completion_quote_character)
 
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