https://git.ruby-lang.org/ruby.git/commit/?id=5f7be6243a

From 5f7be6243a5b0cdbf1abc8967a512e48c2f1489e Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Tue, 28 Jan 2020 13:36:46 +0900
Subject: support multi-run for test/ruby/test_encoding.rb

Unique encoding name is required.

diff --git a/test/ruby/test_encoding.rb b/test/ruby/test_encoding.rb
index 019cb24..024d21b 100644
--- a/test/ruby/test_encoding.rb
+++ b/test/ruby/test_encoding.rb
@@ -56,8 +56,8 @@ class TestEncoding < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_encoding.rb#L56
   end
 
   def test_replicate
-    assert_instance_of(Encoding, Encoding::UTF_8.replicate('UTF-8-ANOTHER'))
-    assert_instance_of(Encoding, Encoding::ISO_2022_JP.replicate('ISO-2022-JP-ANOTHER'))
+    assert_instance_of(Encoding, Encoding::UTF_8.replicate("UTF-8-ANOTHER#{Time.now.to_f}"))
+    assert_instance_of(Encoding, Encoding::ISO_2022_JP.replicate("ISO-2022-JP-ANOTHER#{Time.now.to_f}"))
     bug3127 = '[ruby-dev:40954]'
     assert_raise(TypeError, bug3127) {Encoding::UTF_8.replicate(0)}
     assert_raise(ArgumentError, bug3127) {Encoding::UTF_8.replicate("\0")}
-- 
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