1 files changed, 8 insertions, 6 deletions
diff --git a/test/testunit/test_redefinition.rb b/test/testunit/test_redefinition.rb
index 677027a331..4540461be1 100644
--- a/test/testunit/test_redefinition.rb
+++ b/test/testunit/test_redefinition.rb
@@ -2,12 +2,14 @@ require 'test/unit'
 
 class TestRedefinition < Test::Unit::TestCase
   def test_redefinition
-    test_out, o = IO.pipe
-    spawn(*@options[:ruby], "#{File.dirname(__FILE__)}/test4test_redefinition.rb", out: File::NULL, err: o)
-    o.close
-
     assert_match /^test\/unit warning: method TestForTestRedefinition#test_redefinition is redefined$/,
-                 test_out.read
-    test_out.close
+                 redefinition
+  end
+
+  def redefinition(*args)
+    IO.popen([*@options[:ruby], "#{File.dirname(__FILE__)}/test4test_redefinition.rb", *args],
+                      err: [:child, :out]) {|f|
+      f.read
+    }
   end
 end