angular test

test.ts

import { fakeAsync, tick } from '@angular/core/testing';

describe('brainstorming test', () => {

  test('ngOnInit() should initiate autocomplete and its dataset', fakeAsync(() => {
  // const mockedTemplateOptions = jest.fn() as any as FormlyTemplateOptions;
    // component.to = mockedTemplateOptions;

    // const mockedTemplateOptions = jest.spyOn(component.to, 'search').mockReturnValue('a');

    component.ngOnInit();
    component.searchDelay = 0;
    component.dataset.subscribe(
      (val: string) => {
        expect(val).toBe('aaa');
        // expect(mockedSearch).toBeCalled();
      }
    )

    component.searchTerm.next('a')
    component.searchTerm.next('a')
    component.searchTerm.next('a')
    tick();

    expect(component.isLoading).toBe(false);
  })
  );
})