Short implementation of a style similar to rspec-given

given.rb

module GivenWhenThen

    def Given(*args, &block)
      if args.first.is_a?(Symbol)
        let(*args, &block)
      else
        before(&block)
      end
    end

    def Given!(*args, &block)
      let!(*args, &block)
    end

    def When(*args, &block)
      before(&block)
    end

    def Then(&block)
      unless @queued_examples
        @queued_examples = []
        __examples = @queued_examples
        it '' do
          __examples.map { |e| self.instance_exec(&e) }
        end
      end
      @queued_examples << block
    end

    alias_method :And, :Then

end

RSpec::Core::ExampleGroup.send :extend, GivenWhenThen