it("runs io actions and makes sure to keep the results in the same order", (done: Function) => {
   let results: any[] = [];
   const resolves: ((n: any) => void)[] = [];
   const impure = withEffectsP((n: number) => {
     return new Promise((resolve, reject) => {
       resolves[n] = resolve;
     });
   });
   const s = sinkStream();
   const mappedS = s.map(impure);
   runNow(performStreamOrdered(mappedS)).subscribe((n) => results.push(n));
   s.push(0);
   s.push(1);
   s.push(2);
   s.push(3);
   s.push(4);
   s.push(5);
   resolves[3](3);
   resolves[1](1);
   resolves[0]("zero");
   resolves[4](undefined);
   resolves[2](2);
   resolves[5](5);
   setTimeout(() => {
     assert.deepEqual(results, ["zero", 1, 2, 3, undefined, 5]);
     done();
   });
 });