带有模拟结构指令的 Angular 测试组件失败

Question

我正在尝试在组件测试中模拟结构指令，但出现错误。

以下测试失败并显示一条消息:

Property binding appSome not used by any directive on an embedded template. Make sure that the property name is spelled correctly and all directives are listed in the "@NgModule.declarations". ("[ERROR ->]TEST

我在 mock 结构指令 SomeDirective与 SomeMockDirective在 app.component.spec.ts 中定义。 测试失败 .

如果我切换声明以使其包含 SomeDirective相反 - 测试通过 .

我想知道为什么我不能让它与模拟版本一起工作。

模板:

<h1 *appSome="true">TEST</h1>

指令(生产种类:)):

@Directive({
  selector: '[appSome]'
})
export class SomeDirective implements OnDestroy {
  show: boolean;
  ...
}

测试:

import { TestBed, async } from '@angular/core/testing';
import { AppComponent } from './app.component';
import { Directive, NO_ERRORS_SCHEMA } from '@angular/core';

@Directive({
  selector: '[appSome]'
})
export class SomeMockDirective {}

describe('AppComponent', () => {
  beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [AppComponent, SomeMockDirective], // test is failing, switch the directive to SomeDirective and it passes
      schemas: [NO_ERRORS_SCHEMA]
    }).compileComponents();
  }));

  it('should create the app', () => {
    const fixture = TestBed.createComponent(AppComponent);
    const app = fixture.debugElement.componentInstance;
    expect(app).toBeTruthy();
  });
});

复制 repo :
https://github.com/felikf/angular-test-directive

git clone https://github.com/felikf/angular-test-directive.git 
npm i
ng test

我的问题是，为什么模拟版本不起作用，即使模拟版本在 providers: [] 中提供并且该指令具有相同的选择器。

Answer 1

模拟版本不起作用，因为您还没有定义 appSome输入属性:

@Directive({
  selector: '[appSome]'
})
export class SomeMockDirective {
  @Input() appSome;  <================= add this
}