import assert from 'assert';
import lodashStable from 'lodash';
import { slice } from './utils.js';
import unzipWith from '../unzipWith.js';
import unzip from '../unzip.js';

describe('unzipWith', function() {
  it('should unzip arrays combining regrouped elements with `iteratee`', function() {
    var array = [[1, 4], [2, 5], [3, 6]];

    var actual = unzipWith(array, function(a, b, c) {
      return a + b + c;
    });

    assert.deepStrictEqual(actual, [6, 15]);
  });

  it('should provide correct `iteratee` arguments', function() {
    var args;

    unzipWith([[1, 3, 5], [2, 4, 6]], function() {
      args || (args = slice.call(arguments));
    });

    assert.deepStrictEqual(args, [1, 2]);
  });

  it('should perform a basic unzip when `iteratee` is nullish', function() {
    var array = [[1, 3], [2, 4]],
        values = [, null, undefined],
        expected = lodashStable.map(values, lodashStable.constant(unzip(array)));

    var actual = lodashStable.map(values, function(value, index) {
      return index ? unzipWith(array, value) : unzipWith(array);
    });

    assert.deepStrictEqual(actual, expected);
  });
});