lodash/test/isArray.spec.js

import lodashStable, { isArray } from 'lodash';
import { falsey, stubFalse, args, slice, symbol, realm } from './utils';

describe('isArray', () => {
    it('should return `true` for arrays', () => {
        expect(isArray([1, 2, 3])).toBe(true);
    });

    it('should return `false` for non-arrays', () => {
        const expected = lodashStable.map(falsey, stubFalse);

        const actual = lodashStable.map(falsey, (value, index) =>
            index ? isArray(value) : isArray(),
        );

        expect(actual).toEqual(expected);

        expect(isArray(args)).toBe(false);
        expect(isArray(true)).toBe(false);
        expect(isArray(new Date())).toBe(false);
        expect(isArray(new Error())).toBe(false);
        expect(isArray(slice)).toBe(false);
        expect(isArray({ 0: 1, length: 1 })).toBe(false);
        expect(isArray(1)).toBe(false);
        expect(isArray(/x/)).toBe(false);
        expect(isArray('a')).toBe(false);
        expect(isArray(symbol)).toBe(false);
    });

    it('should work with an array from another realm', () => {
        if (realm.array) {
            expect(isArray(realm.array)).toBe(true);
        }
    });
});