https://git.ruby-lang.org/ruby.git/commit/?id=4a8acf4625

From 4a8acf46258e1b6fb57e75e4461f9e4895064bda Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 30 Apr 2020 22:54:42 +0900
Subject: [ruby/irb] Restore the default encodings

IRB::ReadlineInputMethod#initialize sets via IRB.set_encoding.

diff --git a/test/irb/test_cmd.rb b/test/irb/test_cmd.rb
index daf6375..e50d036 100644
--- a/test/irb/test_cmd.rb
+++ b/test/irb/test_cmd.rb
@@ -17,12 +17,16 @@ module TestIRB https://github.com/ruby/ruby/blob/trunk/test/irb/test_cmd.rb#L17
       Dir.chdir(@tmpdir)
       @home_backup = ENV["HOME"]
       ENV["HOME"] = @tmpdir
+      @default_encoding = [Encoding.default_external, Encoding.default_internal]
     end
 
     def teardown
       ENV["HOME"] = @home_backup
       Dir.chdir(@pwd)
       FileUtils.rm_rf(@tmpdir)
+      EnvUtil.suppress_warning {
+        Encoding.default_external, Encoding.default_internal = *@default_encoding
+      }
     end
 
     def test_irb_info_multiline
-- 
cgit v0.10.2


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