Spock のようななにかを Ruby で。の仮実装。これは spec 側。実装は https://gist.github.com/sunaot/9efce49897e3dbf98fca にあります。

spock-like-spec.rb

class Foo
  extend  Ruby::Spock

  spec 'maximum of two numbers', ->(*) {
    expect ->(a, b, c) { [a, b].max == c }
    where [
      # a | b | c
      [ 1 , 3 , 3 ],
      [ 7 , 4 , 4 ],
      [ 0 , 0 , 0 ],
    ]
  }

  spec 'minimum of two numbers' do
    expect ->(a, b, c) { [a, b].min == c }
    where [
      # a | b | c
      [ 1 , 3 , 1 ],
      [ 7 , 4 , 4 ],
      [ 0 , 0 , 0 ],
    ]
  end
end