# File lib/minitest/unit.rb, line 149
    def assert_respond_to obj, meth, msg = nil
      msg = message(msg) {
          "Expected #{mu_pp(obj)} (#{obj.class}) to respond to ##{meth}"
        }
      flip = (Symbol === obj) && ! (Symbol === meth) # HACK for specs
      obj, meth = meth, obj if flip
      assert obj.respond_to?(meth), msg
    end