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

describe('pull methods', function() {
  lodashStable.each(['pull', 'pullAll', 'pullAllWith'], function(methodName) {
    var func = _[methodName],
        isPull = methodName == 'pull';

    function pull(array, values) {
      return isPull
        ? func.apply(undefined, [array].concat(values))
        : func(array, values);
    }

    it('`_.' + methodName + '` should modify and return the array', function() {
      var array = [1, 2, 3],
          actual = pull(array, [1, 3]);

      assert.strictEqual(actual, array);
      assert.deepStrictEqual(array, [2]);
    });

    it('`_.' + methodName + '` should preserve holes in arrays', function() {
      var array = [1, 2, 3, 4];
      delete array[1];
      delete array[3];

      pull(array, [1]);
      assert.ok(!('0' in array));
      assert.ok(!('2' in array));
    });

    it('`_.' + methodName + '` should treat holes as `undefined`', function() {
      var array = [1, 2, 3];
      delete array[1];

      pull(array, [undefined]);
      assert.deepStrictEqual(array, [1, 3]);
    });

    it('`_.' + methodName + '` should match `NaN`', function() {
      var array = [1, NaN, 3, NaN];

      pull(array, [NaN]);
      assert.deepStrictEqual(array, [1, 3]);
    });
  });
});