MatcherWrapper

matcher_wrapper.rb

class MatcherWrapper
  def initialize(matcher)
    @matcher = matcher
  end
  
  def diffable?
    with_default(false) { @matcher.diffable? }
  end
  
  def description
    with_default(matcher.inspect) { @matcher.description }
  end
  
  # ... and all other optional matcher protocol methods ...
  
private

  def with_default(default)
    yield
  rescue NoMethodError
    default
  end
end