lodash/test/isDate.spec.ts

import assert from 'node:assert';
import lodashStable from 'lodash';
import { falsey, stubFalse, args, slice, symbol, realm } from './utils';
import isDate from '../src/isDate';

describe('isDate', () => {
    it('should return `true` for dates', () => {
        assert.strictEqual(isDate(new Date()), true);
    });

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

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

        assert.deepStrictEqual(actual, expected);

        assert.strictEqual(isDate(args), false);
        assert.strictEqual(isDate([1, 2, 3]), false);
        assert.strictEqual(isDate(true), false);
        assert.strictEqual(isDate(new Error()), false);
        assert.strictEqual(isDate(slice), false);
        assert.strictEqual(isDate({ a: 1 }), false);
        assert.strictEqual(isDate(1), false);
        assert.strictEqual(isDate(/x/), false);
        assert.strictEqual(isDate('a'), false);
        assert.strictEqual(isDate(symbol), false);
    });

    it('should work with a date object from another realm', () => {
        if (realm.date) {
            assert.strictEqual(isDate(realm.date), true);
        }
    });
});