promise-jwt

    const assert = require('assert');
    const {
        decode,
        sign,
        verify
    } = require('./');

    const secret = 'mySecret';
    const jwt = sign({
        role: 'admin',
        user: 'admin'
    }, secret);

    // should decode
    jwt.then(token => {
            return decode(token, secret);
        })
        .then(payload => {
            assert.deepStrictEqual(payload, {
                role: 'admin',
                user: 'admin',
                iat: payload.iat
            });
        });

    // should verify
    jwt.then(token => {
        return verify(token, secret);
    })
    .then(payload => {
        assert.deepStrictEqual(payload, {
            role: 'admin',
            user: 'admin',
            iat: payload.iat
        });
    });

    // handle invalid signature
    jwt.then(token => {
            return verify(token, 'wrongSectet');
        })
        .catch(err => {
            assert.strictEqual(err.message, 'invalid signature');
        });