RocketChat/Rocket.Chat

import { Base64 } from './base64';

describe('empty input', () => {
    it('should encode empty string', () => {
        expect(Base64.encode(new Uint8Array(0))).toStrictEqual('');
    });

    it('should decode empty string', () => {
        expect(Base64.decode('')).toStrictEqual(new Uint8Array(new ArrayBuffer(0)));
    });
});

describe('text examples', () => {
    it.each([
        ['pleasure.', 'cGxlYXN1cmUu'],
        ['leasure.', 'bGVhc3VyZS4='],
        ['easure.', 'ZWFzdXJlLg=='],
        ['asure.', 'YXN1cmUu'],
        ['sure.', 'c3VyZS4='],
    ])('encodes and decodes %p', (txt, res) => {
        const encoded = Base64.encode(Buffer.from(txt, 'ascii'));
        expect(encoded).toBe(res);

        const decoded = Buffer.from(Base64.decode(res)).toString('ascii');
        expect(decoded).toBe(txt);
    });
});

describe('non-text examples', () => {
    it.each([
        [[0, 0, 0], 'AAAA'],
        [[0, 0, 1], 'AAAB'],
    ])('encodes and decodes %p', (array, b64) => {
        const encoded = Base64.encode(array);
        expect(encoded).toBe(b64);

        const decoded = Base64.decode(b64);
        const expectedAsBinary = Uint8Array.from({ length: array.length }, (_, i) => array[i]);
        expect(decoded).toStrictEqual(expectedAsBinary);
    });
});