envutil.rb: fix argument order

* test/ruby/envutil.rb (Test::Test#assert_warning): fix expected
  and actual results order.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47169 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/test/ruby/envutil.rb b/test/ruby/envutil.rb
index bbfdbf6d22..81b982cc70 100644
--- a/test/ruby/envutil.rb
+++ b/test/ruby/envutil.rb
@@ -400,7 +400,7 @@ eom
 
       def assert_warning(pat, msg = nil)
         stderr = EnvUtil.verbose_warning { yield }
-        msg = message(msg) {diff stderr, pat}
+        msg = message(msg) {diff pat, stderr}
         assert(pat === stderr, msg)
       end