merge some async advices showcase

advice-merge.spec.js

import { beforeMethod } from "..";

const Delay = secs => meta => setTimeout(meta.commit, secs);

const soMuchDelay = [Delay(1000), Delay(1000), Delay(1000)];

const someBehavior = beforeMethod(...soMuchDelay, Delay(5));

class Car {

  @someBehavior
  startEngine(cbk){
    cbk();
  }
}

let carInstance;

describe("advance reflect.advice specs", () => {
  beforeEach(() => {
    carInstance = new Car;
  })

  it("Delay advice should stop the execution for a while", done => {
    const time = Date.now();
    carInstance.startEngine(function() {
      expect(Date.now() - time).toBeGreaterThan(3000);
      expect(Date.now() - time).toBeLessThan(3100);
      done();
    });
  });
})