assert_warn, assert_warning

* test/ruby/envutil.rb (assert_warn): add optional message argument.

* test/ruby/envutil.rb (assert_warning): moved from test_io_m17n.rb

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@34994 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/envutil.rb

@@ -179,9 +179,14 @@ module Test
         assert(status.success?, m)
       end
 
-      def assert_warn(msg)
+      def assert_warn(pat, message = nil)
+        message ||= proc {"warning message #{stderr.inspect} is expected to match #{pat.inspect}"}
         stderr = EnvUtil.verbose_warning { yield }
-        assert(msg === stderr, "warning message #{stderr.inspect} is expected to match #{msg.inspect}")
+        assert(pat === stderr, message)
+      end
+
+      def assert_warning(*args)
+        assert_warn(*args) {$VERBOSE = false; yield}
       end
 
       def assert_no_memory_leak(args, prepare, code, message=nil, limit: 1.5)

test/ruby/test_io_m17n.rb

@@ -1,7 +1,6 @@
 require 'test/unit'
 require 'tmpdir'
 require 'timeout'
-require 'stringio'
 require_relative 'envutil'
 
 class TestIO_M17N < Test::Unit::TestCase
@@ -12,17 +11,6 @@ class TestIO_M17N < Test::Unit::TestCase
     Encoding::UTF_8
   ]
 
-  def assert_warning(pat, mesg=nil)
-    begin
-      org_stderr = $stderr
-      $stderr = StringIO.new(warn = '')
-      yield
-    ensure
-      $stderr = org_stderr
-    end
-    assert_match(pat, warn, mesg)
-  end
-
   def with_tmpdir
     Dir.mktmpdir {|dir|
       Dir.chdir(dir) {