import {IncomingMessage, createServer, ServerResponse} from 'http'; import {Server} from 'http'; export class DummyServer { private server: Server; public constructor(port: number) { this.server = createServer((req: IncomingMessage, res: ServerResponse) => { res.end(`port ${port} taken`); }).listen(port); } public async close() { return new Promise<void>((resolve, reject) => { this.server.close((err) => { if (err) { reject(err); } else { resolve(); } }); }); } }