lodash/test/repeat.spec.ts

import assert from 'node:assert';
import lodashStable from 'lodash';
import { falsey, stubThree } from './utils';
import repeat from '../src/repeat';

describe('repeat', () => {
    const string = 'abc';

    it('should repeat a string `n` times', () => {
        assert.strictEqual(repeat('*', 3), '***');
        assert.strictEqual(repeat(string, 2), 'abcabc');
    });

    it('should treat falsey `n` values, except `undefined`, as `0`', () => {
        const expected = lodashStable.map(falsey, (value) => (value === undefined ? string : ''));

        const actual = lodashStable.map(falsey, (n, index) =>
            index ? repeat(string, n) : repeat(string),
        );

        assert.deepStrictEqual(actual, expected);
    });

    it('should return an empty string if `n` is <= `0`', () => {
        assert.strictEqual(repeat(string, 0), '');
        assert.strictEqual(repeat(string, -2), '');
    });

    it('should coerce `n` to an integer', () => {
        assert.strictEqual(repeat(string, '2'), 'abcabc');
        assert.strictEqual(repeat(string, 2.6), 'abcabc');
        assert.strictEqual(repeat('*', { valueOf: stubThree }), '***');
    });

    it('should coerce `string` to a string', () => {
        assert.strictEqual(repeat(Object(string), 2), 'abcabc');
        assert.strictEqual(repeat({ toString: lodashStable.constant('*') }, 3), '***');
    });

    it('should work as an iteratee for methods like `_.map`', () => {
        const actual = lodashStable.map(['a', 'b', 'c'], repeat);
        assert.deepStrictEqual(actual, ['a', 'b', 'c']);
    });
});