在Angular app中测试

Question

在终端中运行ng test时出现问题。错误是

  

＆＃34;键入＆＃39; FormGroup＆＃39;不能分配给＆＃39; FormArray＆＃39;

。   属性类型'controls'不兼容。 ＆＃34;

我该如何解决这个问题？ ------------------------------------------ /这是一个提供我的课程一个问题-----------------

这是代码

import { async, ComponentFixture, TestBed } from '@angular/core/testing';

import { SharedModule } from '../../../../shared/shared.module';

import { FormGroup, Validators, FormControl, FormArray } from '@angular/forms';
import { StepAvailabilityComponent } from './step-availability.component';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';

describe('StepAvailabilityComponent', () => {
  let component: StepAvailabilityComponent;
  let fixture: ComponentFixture<StepAvailabilityComponent>;

  beforeEach(async(() => {
    TestBed.configureTestingModule({
        declarations: [ StepAvailabilityComponent ],
        imports: [SharedModule, FormsModule, ReactiveFormsModule]
    })
    .compileComponents();
  }));enter code here

  beforeEach(() => {
    fixture = TestBed.createComponent(StepAvailabilityComponent);
    component = fixture.componentInstance;
      component.fg = new FormGroup({operatingDays: new FormArray(
          [
          new FormGroup({
              enabled: new FormControl(false),
              localName: new FormControl('mandag'),
          }),
          ]
      )});
    fixture.detectChanges();
  });