How to use the @angular/core/testing.TestBed.createComponent function in @angular/core

beforeEach(() => {
    fixture = TestBed.createComponent(AccountAddressesPageComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
    element = fixture.nativeElement;
  });
  it('should be created', () => {

beforeEach(() => {
    fixture = TestBed.createComponent(LocalFavouritePageComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
  });

beforeEach(() => {
    fixture = TestBed.createComponent(ProductShipmentComponent);
    component = fixture.componentInstance;
    translate = TestBed.get(TranslateService);
    translate.setDefaultLang('en');
    translate.use('en');
    product = { sku: 'sku' } as Product;
    product.availability = true;
    element = fixture.nativeElement;
    component.product = product;
  });

beforeEach(() => {
    fixture = TestBed.createComponent(ListNodeInfoComponent);
    component = fixture.componentInstance;
    component.node = {
      code: '',
      conceptId: 903133,
      count: 0,
      domainId: 'Measurement',
      group: false,
      hasAttributes: true,
      id: 316305,
      name: 'Height Detail',
      parentId: 0,
      predefinedAttributes: null,
      selectable: true,
      subtype: 'HEIGHT',
      type: 'PM'
    };

beforeEach(() => {
    fixture = TestBed.createComponent(SongTableComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
  });

beforeEach(() => {
        fixture = TestBed.createComponent(DatepickerComponent);
        component = fixture.componentInstance;
        fixture.detectChanges();
    });

beforeEach(() => {
        fixture = TestBed.createComponent(DashboardSelectedComponent);
        component = fixture.componentInstance;
        fixture.detectChanges();
    });

beforeEach(() => {
    fixture = TestBed.createComponent(GunSoundComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
  });

TestBed.compileComponents().then(() => {

      const fixture = TestBed.createComponent(TestComponent);
      fixture.detectChanges();
      tick();
      const element = fixture.debugElement.query(By.css('div'));

      expect(element.nativeElement.style.fontSize).toBe('x-large');

    });
  }));

beforeEach(() => {
    fixture = TestBed.createComponent(HomeEntranceComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
  });