aghast test handler using shot^H^H^H^Hpickleback

test.ts

import { IncomingMessage, ServerResponse } from 'http';
import { inject, RequestOptions } from 'pickleback';

import { Opts, defaults } from '../opts';

export interface TestHarness<R> {
  (reqOpts: RequestOptions, opts?: Opts): Promise<R>
}

export interface TestHandler<R> {
  (req: IncomingMessage, res: ServerResponse, opts: Opts): R
}

export function testHarness<R>(
  handler: TestHandler<R>
): TestHarness<R> {
  return async (reqOpts: RequestOptions, opts: Opts = defaults): Promise<R> => {
    function httpHandler(req: IncomingMessage, res: ServerResponse): void {
      const result: R = handler(req, res, opts);
      res.writeHead(200);
      res.end(JSON.stringify(result));
    }

    return <R>JSON.parse(await inject(httpHandler, reqOpts));
  }
}