lodash/test/uniqWith.spec.js

import lodashStable from 'lodash';
import { LARGE_ARRAY_SIZE, isEven } from './utils';
import uniqWith from '../src/uniqWith';

describe('uniqWith', () => {
    it('should work with a `comparator`', () => {
        const objects = [
            { x: 1, y: 2 },
            { x: 2, y: 1 },
            { x: 1, y: 2 },
        ];
        const actual = uniqWith(objects, lodashStable.isEqual);

        expect(actual, [objects[0]).toEqual(objects[1]]);
    });

    it('should preserve the sign of `0`', () => {
        const largeArray = lodashStable.times(LARGE_ARRAY_SIZE, (index) =>
            isEven(index) ? -0 : 0,
        );

        const arrays = [[-0, 0], largeArray];
        const expected = lodashStable.map(arrays, lodashStable.constant(['-0']));

        const actual = lodashStable.map(arrays, (array) =>
            lodashStable.map(uniqWith(array, lodashStable.eq), lodashStable.toString),
        );

        expect(actual).toEqual(expected);
    });
});