From 50bb8b6052a1fdec72ac46f9736719438fd5002c Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Fri, 14 Jun 2019 08:15:39 +0900
Subject: [PATCH] Use Exception#full_message for traceback

---
 test/lib/test/unit/assertions.rb | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/test/lib/test/unit/assertions.rb b/test/lib/test/unit/assertions.rb
index bee32d1b83..c3a2a5b36e 100644
--- a/test/lib/test/unit/assertions.rb
+++ b/test/lib/test/unit/assertions.rb
@@ -858,13 +858,7 @@ eom
           msg = "exceptions on #{errs.length} threads:\n" +
             errs.map {|t, err|
             "#{t.inspect}:\n" +
-            err.backtrace.map.with_index {|line, i|
-              if i == 0
-                "#{line}: #{err.message} (#{err.class})"
-              else
-                "\tfrom #{line}"
-              end
-            }.join("\n")
+              err.full_message(highlight: false, order: :top)
           }.join("\n---\n")
           if message
             msg = "#{message}\n#{msg}"