https://git.ruby-lang.org/ruby.git/commit/?id=e6a8590aa4

From e6a8590aa4216915ee15a7b231189254b03c22b1 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Fri, 3 Jul 2020 11:05:08 +0900
Subject: Reintroduce c565dfb09ad7d55fa671f65cea7088a914bf1931


diff --git a/test/json/test_helper.rb b/test/json/test_helper.rb
index c5ec0fc..446c020 100644
--- a/test/json/test_helper.rb
+++ b/test/json/test_helper.rb
@@ -1,12 +1,12 @@ https://github.com/ruby/ruby/blob/trunk/test/json/test_helper.rb#L1
 case ENV['JSON']
 when 'pure'
-  $:.unshift 'lib'
+  $:.unshift File.join(__dir__, '../lib')
   require 'json/pure'
 when 'ext'
-  $:.unshift 'ext', 'lib'
+  $:.unshift File.join(__dir__, '../ext'), File.join(__dir__, '../lib')
   require 'json/ext'
 else
-  $:.unshift 'ext', 'lib'
+  $:.unshift File.join(__dir__, '../ext'), File.join(__dir__, '../lib')
   require 'json'
 end
 
-- 
cgit v0.10.2


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