https://git.ruby-lang.org/ruby.git/commit/?id=129ecb43e5

From 129ecb43e54b3249734c69787f813d49ce995567 Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Wed, 23 Dec 2020 21:19:27 +0900
Subject: [ruby/irb] Fix error_message for assert_dynamic_prompt

https://github.com/ruby/irb/commit/b12dfb6298

diff --git a/test/irb/test_ruby_lex.rb b/test/irb/test_ruby_lex.rb
index 255a5a1..41b5d49 100644
--- a/test/irb/test_ruby_lex.rb
+++ b/test/irb/test_ruby_lex.rb
@@ -281,8 +281,14 @@ module TestIRB https://github.com/ruby/ruby/blob/trunk/test/irb/test_ruby_lex.rb#L281
       skip if RUBY_ENGINE == 'truffleruby'
       ruby_lex = RubyLex.new()
       io = MockIO_DynamicPrompt.new(lines) do |prompt_list|
-        error_message = "Calculated the wrong number of spaces for:\n #{lines.join("\n")}"
-        assert_equal(expected_prompt_list, prompt_list)
+        error_message = <<~EOM
+          Expected dynamic prompt:
+          #{expected_prompt_list.join("\n")}
+
+          Actual dynamic prompt:
+          #{prompt_list.join("\n")}
+        EOM
+        assert_equal(expected_prompt_list, prompt_list, error_message)
       end
       ruby_lex.set_prompt do |ltype, indent, continue, line_no|
         '%03d:%01d:%1s:%s ' % [line_no, indent, ltype, continue ? '*' : '>']
-- 
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