How to test Angular custom elements and do coverage in module ngDoBootstrap

Module Config

• I would like to complete coverage in my module but can seem to find a way of referencing/spyOn the customElements.define inside the bootstrap.

bonus:

• 
  help with the useFactory coverage would be much appreciated.
  
  
• 
  this test pass so far.
  

it('initializes', () => {
const module: AppModule = TestBed.inject(AppModule);
expect(module).toBeTruthy();
});

it('ngDoBootstrap', () => {
const module: AppModule = TestBed.inject(AppModule);
spyOn(module, "ngDoBootstrap");
module.ngDoBootstrap();
expect(module.ngDoBootstrap).toHaveBeenCalled();
});

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