import {Component, NgModule} from '@angular/core'
import {render, screen} from '@testing-library/angular'
import {ngMocks} from 'ng-mocks'

@Component({
  selector: 'app-parent-component',
  template: '<app-child-component></app-child-component>',
})
class ParentComponent {}

@Component({
  selector: 'app-child-component',
  template: '<p>Child component</p>',
})
class ChildComponent {}

@NgModule({
  declarations: [ParentComponent, ChildComponent],
})
export class AppModule {}

describe('ParentComponent', () => {
  it('should not render ChildComponent when shallow rendering', async () => {
    const dependencies = ngMocks.guts(null, AppModule, ParentComponent)

    await render(ParentComponent, dependencies)

    expect(screen.queryByText('Child component')).toBeNull()
  })
})

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

import { Hero } from './hero';

@Component({
  selector: 'app-hero-child',
  template: `
    <h3>{{hero.name}} says:</h3>
    <p>I, {{hero.name}}, am at your service, {{masterName}}.</p>
  `
})
export class HeroChildComponent {
  @Input() hero!: Hero;
  @Input('master') masterName = '';
}

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

@Component({
  selector: 'app-name-child',
  template: '<h3>"{{name}}"</h3>'
})
export class NameChildComponent {
  @Input()
  get name(): string { return this._name; }
  set name(name: string) {
    this._name = (name && name.trim()) || '<no name set>';
  }
  private _name = '';
}

import { Directive, ViewContainerRef } from '@angular/core';

@Directive({
  selector: '[adHost]',
})
export class AdDirective {
  constructor(public viewContainerRef: ViewContainerRef) { }
}

import { Directive, Input, TemplateRef, ViewContainerRef } from '@angular/core';

@Directive({ selector: '[appUnless]'})
export class UnlessDirective {
}