How to test document clicks in unit tests in angular

We have a drop-down component that has its dropdown collapsed on any outside click. This is implemented as:

  @HostListener('document:click', ['$event'])
  public documentClick(event) {
    if (this.dropdownIsOpen && !event.clickedFromMe) {
      this.dropdownIsOpen = false;
    }
  }

How can this code be tested? When using TestBed.createComponent, only the component seems to be created, and it is not inside any document, so how can I simulate a click outside of that component?