From 9ddeb957fd99115496bc6d676f7e2ec479739576 Mon Sep 17 00:00:00 2001
From: naruse <naruse@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 20 Nov 2015 23:51:44 +0000
Subject: read may return nil

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52689 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/lib/test/unit.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/lib/test/unit.rb b/test/lib/test/unit.rb
index 2cd554bd66..d886f29c73 100644
--- a/test/lib/test/unit.rb
+++ b/test/lib/test/unit.rb
@@ -325,7 +325,7 @@ module Test
       def deal(io, type, result, rep, shutting_down = false)
         worker = @workers_hash[io]
         cmd = worker.read
-        cmd.sub!(/\A\.+/, '')
+        cmd.sub!(/\A\.+/, '') if cmd # read may return nil
         case cmd
         when ''
           # just only dots, ignore
-- 
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