method_missing.rb

class MM2

    def setup
        puts "Setup"
    end

    def teardown
        puts "Tear down"
    end

    # The method_missing() does all of the work here. We check if the 
    # name is setup_something_teardown and if it is, we call setup,
    # call something with the parameters passed in, and then call teardown.
    # If the method isn't of this form, we just pass it along.
    def method_missing(name, *args, &block)
        case (name)
        when /^setup_(.*)_teardown/
            setup
            send($1, *args, & block) 
            teardown
        else
            super
        end
    end

    def x
        puts "Called x"
    end

    def y
        puts "Called y"
    end
end

if __FILE__ == $PROGRAM_NAME

    # Create a new MM1
    mm1 = MM1.new

    # Call the two mehtods that do exist.
    mm1.x
    mm1.y

    # Create a new MM2
    mm2 = MM2.new
    mm2.setup_x_teardown
    mm2.setup_y_teardown
end