test.js

var test = require('tape')
var multichoose = require('./')

test('multichoose test', function (t) {

  t.plan(2)

  var c = [ [ 1, 1 ],
            [ 1, 2 ],
            [ 1, 3 ],
            [ 2, 2 ],
            [ 2, 3 ],
            [ 3, 3 ] ]

  var r = []
  multichoose(2, [1,2,3],
              function(x) {
                r.push(x)
              })

  t.deepEqual(c, r)

  c = [ [ 0, 0, 0 ],
        [ 0, 0, 1 ],
        [ 0, 0, 2 ],
        [ 0, 0, 3 ],
        [ 0, 0, 4 ],
        [ 0, 1, 1 ],
        [ 0, 1, 2 ],
        [ 0, 1, 3 ],
        [ 0, 1, 4 ],
        [ 0, 2, 2 ],
        [ 0, 2, 3 ],
        [ 0, 2, 4 ],
        [ 0, 3, 3 ],
        [ 0, 3, 4 ],
        [ 0, 4, 4 ],
        [ 1, 1, 1 ],
        [ 1, 1, 2 ],
        [ 1, 1, 3 ],
        [ 1, 1, 4 ],
        [ 1, 2, 2 ],
        [ 1, 2, 3 ],
        [ 1, 2, 4 ],
        [ 1, 3, 3 ],
        [ 1, 3, 4 ],
        [ 1, 4, 4 ],
        [ 2, 2, 2 ],
        [ 2, 2, 3 ],
        [ 2, 2, 4 ],
        [ 2, 3, 3 ],
        [ 2, 3, 4 ],
        [ 2, 4, 4 ],
        [ 3, 3, 3 ],
        [ 3, 3, 4 ],
        [ 3, 4, 4 ],
        [ 4, 4, 4 ] ]

  r = []
  multichoose(3, [0,1,2,3,4],
              function(x) {
                r.push(x)
              })
  t.deepEqual(c, r)

});