gistfile1.txt

function runServer(databaseUrl = DATABASE_URL, port = PORT) {
	return new Promise((resolve, reject) => {
		mongoose.connect(databaseUrl, err => {
			if (err) {
				return reject(err);
			}
			server = app.listen(port, () => {
					console.log(`Your app is listening on port ${port}`);
					resolve();
				})
				.on('error', err => {+
					mongoose.disconnect();
					reject(err);
				});
		});
	});
}

function closeServer() {
	return mongoose.disconnect().then(() => {
		return new Promise((resolve, reject) => {
			console.log('Closing server');
			server.close(err => {
				if (err) {
					return reject(err);
				}
				resolve();
			});
		});
	});
}