“规范（...）没有期望。”

Question

我有以下简单的汉堡菜单组件：

import { Component, OnInit, Input, EventEmitter, Output } from '@angular/core';

export class BurgerMenuOption {
  key: string;
  text: string;
}

@Component({
  selector: 'app-burger-menu',
  templateUrl: './burger-menu.component.html',
  styleUrls: ['./burger-menu.component.scss']
})
export class BurgerMenuComponent implements OnInit {
  @Input() options: BurgerMenuOption[];
  @Output() optionSelected = new EventEmitter();

  ngOnInit(): void {
  }

  selectOption(option: BurgerMenuOption) {
    this.optionSelected.emit(option);
  }
}

这是我的规格文件：

import { async, ComponentFixture, TestBed } from '@angular/core/testing';
import { NO_ERRORS_SCHEMA } from '@angular/core';
import { BurgerMenuComponent } from './burger-menu.component';
import { MatIconModule } from "@angular/material/icon";

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

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [ BurgerMenuComponent ],
      imports:[MatIconModule],
      schemas: [NO_ERRORS_SCHEMA]
    })
    .compileComponents();
  }));

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

  it('should create', () => {
    expect(component).toBeTruthy();
  });

  it('should correctly render the passed @Input value', () => {
    const compiled = fixture.debugElement.nativeElement;
    expect(compiled.querySelector('button')).toBeNull();

    component.options = [{key: '1', text: 'test'}]
    fixture.detectChanges();
    expect(compiled.querySelector('button').textContent).toBe('test');
  });
});

模板为：

<div ngbDropdown>
  <mat-icon ngbDropdownToggle class="burger-menu">menu</mat-icon>
  <div ngbDropdownMenu aria-labelledby="dropdownBasic1">
      <button ngbDropdownItem *ngFor="let option of options" (click)="selectOption(option)">{{ option.text }}</button>
  </div>
</div>

运行ng test时收到的错误消息是：

  

错误：'Spec'BurgerMenuComponent应该正确呈现传递的   @输入值'没有期望。'

但是，我在那里的两个期望语句不算作期望吗？它算什么是期望，什么不是期望？