Added test to ensure that silence_warnings also returned its value

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2180 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activesupport/test/core_ext/kernel_test.rb

@@ -16,4 +16,8 @@ class KernelTest < Test::Unit::TestCase
       assert_equal old_verbose, $VERBOSE
     end
   end
+  
+  def test_silence_warnings_with_return_value
+    assert_equal 1, silence_warnings { 1 }
+  end
 end