rspec.rb

class Describe
  attr_reader :context_name, :examples

  def initialize(context_name, &block)
    @context_name = context_name
    @describes = []
    @examples = []
    instance_eval &block
  end

  def describe(context_name, &block)
    describes << Describe.new(context_name, &block)
  end

  def it(context_name, &block)
    examples << Example.new(context_name, &block)
  end

  private
  attr_accessor :describes
end