koa-e2e.js

// Good approach
'use strict';

const coRequest = require('co-request'),
    tape = require('tape'),
    coTape = require('co-tape'),
    makeServer = require('../..');

tape('heartbeat', function(t) {
    const app = makeServer();

    t.test('serves heartbeat request', coTape(function*(t) {
        t.plan(2);

        let response = yield coRequest('https://localhost:3000/heartbeat');

        t.equal(response.body, 'OK', 'returns the correct response');
        t.equal(response.statusCode, 200, 'should have status code 200');
    }));
});