import assert from 'assert';
import lodashStable from 'lodash';
import { _, args } from './utils.js';

describe('union methods', function() {
  lodashStable.each(['union', 'unionBy', 'unionWith'], function(methodName) {
    var func = _[methodName];

    it('`_.' + methodName + '` should return the union of two arrays', function() {
      var actual = func([2], [1, 2]);
      assert.deepStrictEqual(actual, [2, 1]);
    });

    it('`_.' + methodName + '` should return the union of multiple arrays', function() {
      var actual = func([2], [1, 2], [2, 3]);
      assert.deepStrictEqual(actual, [2, 1, 3]);
    });

    it('`_.' + methodName + '` should not flatten nested arrays', function() {
      var actual = func([1, 3, 2], [1, [5]], [2, [4]]);
      assert.deepStrictEqual(actual, [1, 3, 2, [5], [4]]);
    });

    it('`_.' + methodName + '` should ignore values that are not arrays or `arguments` objects', function() {
      var array = [0];
      assert.deepStrictEqual(func(array, 3, { '0': 1 }, null), array);
      assert.deepStrictEqual(func(null, array, null, [2, 1]), [0, 2, 1]);
      assert.deepStrictEqual(func(array, null, args, null), [0, 1, 2, 3]);
    });
  });
});