gistfile1.rb

Spec::Matchers.create :be_same_list do |other|
  match do |me|
    me.sort == other.sort
  end
end

[1, 2, 3, 4].should be_same_list([2, 1 ,4, 3])
[1, 2, 3, 4].should_not be_same_list([2, 4, 3])

# or

def be_same_list(other)
  simple_match('same list') do |me|
    me.sort == other.sort
  end
end