https://git.ruby-lang.org/ruby.git/commit/?id=bed17974a1

From bed17974a1563852c3d1d2b7b24033ed0beaa33e Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Thu, 18 Jun 2020 09:37:54 +0900
Subject: test/webrick/test_filehandler.rb: no `.encode("filesystem")` if
 US-ASCII

http://ci.rvm.jp/logfiles/brlog.trunk-theap-asserts.20200618-002305
```
I, [2020-06-18T00:28:11.661066 #31625]  INFO -- :   1) Failure:
I, [2020-06-18T00:28:11.661157 #31625]  INFO -- : WEBrick::TestFileHandler#test_cjk_in_path [/tmp/ruby/v3/src/trunk-theap-asserts/test/webrick/utils.rb:72]:
I, [2020-06-18T00:28:11.661216 #31625]  INFO -- : exceptions on 1 threads:
I, [2020-06-18T00:28:11.661269 #31625]  INFO -- : U+3042 from UTF-8 to US-ASCII
```

diff --git a/test/webrick/test_filehandler.rb b/test/webrick/test_filehandler.rb
index ffd10cc..1d2895f 100644
--- a/test/webrick/test_filehandler.rb
+++ b/test/webrick/test_filehandler.rb
@@ -294,8 +294,13 @@ class WEBrick::TestFileHandler < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/webrick/test_filehandler.rb#L294
       config = { :DocumentRoot => dir }
       TestWEBrick.start_httpserver(config) do |server, addr, port, log|
         http = Net::HTTP.new(addr, port)
-        filesystem_path = "\u3042".encode("filesystem").bytes.map {|b| "%%%X" % b }.join
-        req = Net::HTTP::Get.new("/#{ filesystem_path }.txt")
+        case enc = Encoding.find('filesystem')
+        when Encoding::US_ASCII, Encoding::ASCII_8BIT
+          filesystem_path = "\u3042"
+        else
+          filesystem_path = "\u3042".encode("filesystem")
+        end
+        req = Net::HTTP::Get.new("/#{ filesystem_path.bytes.map {|b| "%%%X" % b }.join }.txt")
         http.request(req){|res| assert_equal("200", res.code, log.call + "\nFilesystem encoding is #{Encoding.find('filesystem')}") }
       end
     end
-- 
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