var expect       = require('chai').expect;
var arrayPairSum = require('../../solutions/javascript/array-pair-sum');

describe('Array Pair Sum', function () {
  it('should find pairs that equal the expected sum', function () {
    expect(arrayPairSum(10, [3, 4, 5, 6, 7])).to.eql([[4, 6], [3, 7]]);
  });

  it('should not output duplicate results', function () {
    expect(arrayPairSum(8, [3, 4, 5, 4, 4])).to.eql([[3, 5], [4, 4], [4, 4], [4, 4]]);
  });

  it('should work not find any matches', function () {
    expect(arrayPairSum(10, [3, 5, 6, 8])).to.eql([]);
  })
});