https://git.ruby-lang.org/ruby.git/commit/?id=9fbbbadc96

From 9fbbbadc9634ec4cdfe378bba62bfb706f4bb03a Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 16 Jul 2020 17:38:58 +0900
Subject: Added just working Test::Unit::CoreAssertions#diff

This is not "diff", but show expected and actual results both,
just to get rid of `NoMethodError` when an assertion failed.

diff --git a/tool/lib/test/unit/core_assertions.rb b/tool/lib/test/unit/core_assertions.rb
index adb797b..235b116 100644
--- a/tool/lib/test/unit/core_assertions.rb
+++ b/tool/lib/test/unit/core_assertions.rb
@@ -635,6 +635,22 @@ eom https://github.com/ruby/ruby/blob/trunk/tool/lib/test/unit/core_assertions.rb#L635
           super
         end
       end
+
+      def diff(exp, act)
+        require 'pp'
+        q = PP.new(+"")
+        q.guard_inspect_key do
+          q.group(2, "expected: ") do
+            q.pp exp
+          end
+          q.text q.newline
+          q.group(2, "actual: ") do
+            q.pp act
+          end
+          q.flush
+        end
+        q.output
+      end
     end
   end
 end
-- 
cgit v0.10.2


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