set equivalence with expect.js

I use expect.js and I'd like to test for set equivalence

Error: expected [ [ 1, 2 ], [ 2, 1 ], [ 0, 1 ], [ 1, 0 ] ] to sort of equal [ [ 1, 2 ], [ 2, 1 ], [ 1, 0 ], [ 0, 1 ] ]

^ this should be true.

I've found this, but how do I integrate it into expect.js?

You can cheat by sorting the array.. (below is coffescript)

 describe 'test', ->
  it 'should match', ->

    a = [ [ 1, 2 ], [ 2, 1 ], [ 0, 1 ], [ 1, 0 ] ]
    b = [ [ 1, 2 ], [ 2, 1 ], [ 1, 0 ], [ 0, 1 ] ]

    expect(a.sort()).to.eql b.sort()