[SOLVED] Check if an array has same elements than other, regardless of the order

Check if an array has same elements than other, regardless of the order

I'm not sure if its a Rspec question, but I only encountred this problem on Rspec tests.

I want to check if an array is equal to another array, regardless of the elements order :

[:b, :a, :c] =?= [:a, :b, :c]

My current version :

my_array.length.should == 3
my_array.should include(:a)
my_array.should include(:b)
my_array.should include(:c)

Is there any method on Rspec, ruby or Rails for do something like this :

my_array.should have_same_elements_than([:a, :b, :c])

Solution

Here was my wrong matcher (thanks @steenslag):

RSpec::Matchers.define :be_same_array_as do |expected_array|
  match do |actual_array|
    (actual_array | expected_array) - (actual_array & expected_array) == []
  end
end

Other solutions:

use the builtin matcher, best solution
use Set:

Something like:

require 'set'
RSpec::Matchers.define :be_same_array_as do |expected_array|
  match do |actual_array|
    Set.new(actual_array) == Set.new(expected_array)
  end
end