あるコレクションの要素がすべてあるクラスを継承 or モジュールをmix-inしているかを検証するmatcher

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RSpec::Matcher.define :be_composed_of do |expected|
  match do |actual|
    actual.all? {|e| expected === e }
  end
end

failure_messages とかいじってないけどとりあえず。

should(be_all {|i| String === i }) とか書いてたけどいい加減ダサいしつらくなってきたのでmatcherを追加。

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