https://git.ruby-lang.org/ruby.git/commit/?id=c9b06d4a4e

From c9b06d4a4e52b6ae705ebb16cafe455671780770 Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Sun, 8 Dec 2019 08:01:27 +0900
Subject: Add test_simple_completion for Readline


diff --git a/test/readline/test_readline.rb b/test/readline/test_readline.rb
index e1c299c..129adc7 100644
--- a/test/readline/test_readline.rb
+++ b/test/readline/test_readline.rb
@@ -578,6 +578,25 @@ module BasetestReadline https://github.com/ruby/ruby/blob/trunk/test/readline/test_readline.rb#L578
     Readline.completer_word_break_characters = saved_completer_word_break_characters
   end
 
+  def test_simple_completion
+    line = nil
+
+    open(IO::NULL, 'w') do |null|
+      IO.pipe do |r, w|
+        Readline.input = r
+        Readline.output = null
+        Readline.completion_proc = ->(text) do
+          ['abcde', 'abc12']
+        end
+        w.write("a\t\n")
+        w.flush
+        line = Readline.readline('> ', false)
+      end
+    end
+
+    assert_equal('abc', line)
+  end
+
   def test_completion_quote_character_completing_unquoted_argument
     return unless Readline.respond_to?(:completion_quote_character)
 
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