assert_nothing_thrown

# File lib/test/unit/assertions.rb, line 170
      def assert_nothing_thrown(msg=nil)
        begin
          ret = yield
        rescue ArgumentError => error
          raise error if /\Auncaught throw (.+)\z/ !~ error.message
          msg = message(msg) { "<#{$1}> was thrown when nothing was expected" }
          flunk(msg)
        end
        assert(true, "Expected nothing to be thrown")
        ret
      end