问无法读取角度单元测试中未定义的属性(读取：“视图模式”)

EN

let docProcess: IDocProcess;

public onCalling(args) {
    if (this.docProcess.viewMode) {
      this.makeCalls(args);
    }
}

export interface IDocProcess {
  viewMode: boolean;
  editMode: boolean;
  deleteMode: boolean;
}

 beforeEach(async(() => {

    TestBed.configureTestingModule({
      imports: [RouterTestingModule],
      declarations: [CallsComponent],
      providers: [
        MockData
      ],
      schemas: [CUSTOM_ELEMENTS_SCHEMA]
    }).compileComponents();
  }));


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


  it('should call makeCalls() only on View Mode', () => {
    
    component.docProcess.viewMode = true;
    fixture.detectChanges();
    component.onCalling(mockArgsData);    
    expect(component.makeCalls).toHaveBeenCalled();