 'use strict'
-{expect, assert} = require 'chai'
+{expect,AssertionError} = require 'chai'
 
 describe 'Individual.pair', ->
   Popuration = require '../lib/popuration'

        .to.deep.equal [1, 1, 1, 1]
      expect offspring.fitness()
        .to.equal 4


      it 'should contains clone of parents if not enough probability', ->
        pair.crossover 0, ->
          throw new AssertionError 'crossover operator should not call'

        expect pair.offsprings
          .to.be.a 'array'
