How to test an async function that uses forkJoin?

Question

JavaScript

There is a function like this:

public method1(): Observable<any> {
  return forkJoin({
    var1: // some var,
    var2: // some var,
    var3: // some var,
    var4: // some var,
    var5: // some var,
    var6: // some var,
  }).pipe(
    switchMap(data => {
      const res = {
        var1: data.var1,
        var2: data.var2,
        var3: data.var3,
        var4: data.var4,
        var5: data.var5,
        var6: data.var6,
      };
      return of(res);
    }),
  );
}

It makes 6 asynchronous requests and combines the result into one object. I would like to write a unit test for it. Here is my attempt:

it('should works', fakeAsync(() => {
  component.MyComponent().subscribe(data => {
    expect(data.var1).toEqual(mock1);
    expect(data.var2).toEqual(mock2);
    expect(data.var3).toEqual(mock3);
    expect(data.var4).toEqual(mock4);
    expect(data.var5).toEqual(mock5);
    expect(data.var6).toEqual(mock6);
    tick();
    discardPeriodicTasks();
    component.ngOnDestroy();
  });
}));

The problem is that after running the tests, the console displays the following error message:

FAIL: 6 periodic timer(s) still in the queue.

I understand that 6 requests are asynchronous, so I wrap the test body in fakeAsync().
I understand that the test should wait until all 6 requests that are in the forkJoin are completed. That's why I use tick().
But all the same the test does not fulfill. Please help me fix it