https://git.ruby-lang.org/ruby.git/commit/?id=1943279426

From 194327942690a7997c7b48d34cc105c6ec8b8d40 Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@r...>
Date: Mon, 9 Dec 2019 19:16:51 +0900
Subject: Added workaround for CoreAssertions used by ruby/logger.


diff --git a/test/logger/helper.rb b/test/logger/helper.rb
index f11720b..9eaeb20 100644
--- a/test/logger/helper.rb
+++ b/test/logger/helper.rb
@@ -3,6 +3,11 @@ $LOAD_PATH.unshift File.join(ROOT_DIR, 'lib') # to use logger in this repo inste https://github.com/ruby/ruby/blob/trunk/test/logger/helper.rb#L3
 $LOAD_PATH.unshift File.join(ROOT_DIR, 'test', 'lib') # to use custom test-unit in this repo
 require 'logger'
 require 'test/unit'
-require 'core_assertions'
 
-Test::Unit::TestCase.include Test::Unit::CoreAssertions
+begin
+  # for standalone test suite on ruby/logger
+  require 'core_assertions'
+
+  Test::Unit::TestCase.include Test::Unit::CoreAssertions
+rescue LoadError
+end
-- 
cgit v0.10.2


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