如何从单元测试中获取/设置FormGroup中的离子2离子输入FormControl值？

我想通过在输入字段中设置值然后检查相关的实例成员来编写与Angular 2 / Ionic 2离子输入字段交互的单元测试 .

具体来说，我想：

• 在组件实例中设置默认值 .

• 验证该值是否在相关的DOM元素中设置 .

• 在相关DOM元素中输入一个值（输入字段）

• 验证它是否反映在组件实例中 .

我有一个正常的HTML输入字段，但有一些关于使用我理解的离子输入字段 .

我的单元测试和测试组件：

/**
* Form Tests
*/

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

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

import { By }              from '@angular/platform-browser';
import { DebugElement }    from '@angular/core';

import {
  AbstractControl,
  FormControl,
  FormGroup,
  FormsModule,
  ReactiveFormsModule
} from '@angular/forms';

import {dispatchEvent} from '@angular/platform-browser/testing/browser_util';

// Ionic imports

import { 

  App, 
  MenuController, 
  NavController, 
  Platform, 
  Config, 
  Keyboard, 
  Form, 
  IonicModule 

} from 'ionic-angular';

describe( 'Ionic Form Tests', 
  () => {

    // -----------------------------------

    /**
    * instance and element in a FormControl should match, right?
    */

    it( 'nativeElement and instance should match with input and ion-input in a FormGroup', 

      fakeAsync(() => {

        TestBed.configureTestingModule({
          declarations: [
            IonicFormTestComponent
          ],
          providers: [
            App,
            Platform,
            Form,

            { provide: Config, useClass: ConfigMock },

          ],
          imports: [
            FormsModule,
            IonicModule,
            ReactiveFormsModule,
          ],
        });

        let fixture: any = TestBed.createComponent( IonicFormTestComponent );

        fixture.whenStable().then(() => {

          fixture.detectChanges();
          tick();

          let instance = fixture.componentInstance;

          // first check that the initial plain input value and element match

          let plainInputEl = fixture.debugElement.query( By.css( '[formControlName="plainInputControl"]' ) ).nativeElement;

          expect( instance.plainInputControl.value ).toEqual( 'plain input control value' );
          expect( plainInputEl.value ).toEqual( 'plain input control value' );

          // now check to see if the model updates when we update the DOM element

          plainInputEl.value = 'updated Plain Input Control Value';

          dispatchEvent( plainInputEl, 'input' );
          fixture.detectChanges();
          tick();

          // this works

          expect( instance.plainInputControl.value ).toEqual( 'updated Plain Input Control Value' );

          // -------------------------------------------------------------
          // repeat with ion-input

          let ionicInputEl = fixture.debugElement.query( By.css( '[formControlName="ionicInputControl"]' ) ).nativeElement;

          expect( instance.ionicInputControl.value ).toEqual( 'ionic input control value' );

          // this fails with ionicInputEl.value 'undefined' 
          // (how to correctly get the value of the ion-input element?)

          expect( ionicInputEl.value ).toEqual( 'ionic input control value' );

          ionicInputEl.value = 'updated Ionic Input Control Value';

          dispatchEvent( ionicInputEl, 'input' );
          fixture.detectChanges()
          tick();

          console.log( "Ionic input element value is:", ionicInputEl.value );

          // this fails, instance.ionicInputControl.value not changed.

          expect( instance.ionicInputControl.value ).toEqual( 'updated Ionic Input Control Value' );

        });

      }) // end of fakeAsync()

    ); // end of it()

  }

); // end of describe()

// -------------------------------------------------

/**
* ionic test component with form Group 
*/

@Component({
  selector: 'ionic-form-test-component',
  template: `
    <form [formGroup]="testFormGroup">
      <input type="text" value="" formControlName="plainInputControl" />
      <ion-input type="text" value="" formControlName="ionicInputControl"></ion-input>
    </form>
   `
})

export class IonicFormTestComponent {

  testFormGroup: FormGroup;
  plainInputControl: AbstractControl;
  ionicInputControl: AbstractControl;


  constructor() {

    this.testFormGroup = new FormGroup({
        'plainInputControl': new FormControl( '' ),
        'ionicInputControl': new FormControl( '' )
    });

    this.plainInputControl = this.testFormGroup.controls[ 'plainInputControl' ];
    this.plainInputControl.setValue( 'plain input control value' );

    this.ionicInputControl = this.testFormGroup.controls[ 'ionicInputControl' ];
    this.ionicInputControl.setValue( 'ionic input control value' );

  }

}

// --------------------------------------------------

export class ConfigMock {

  public get(): any {
    return '';
  }

  public getBoolean(): boolean {
    return true;
  }

  public getNumber(): number {
    return 1;
  }
}

// END

如何在单元测试中以编程方式获取/设置离子输入字段的值，以便上述工作？

显然我错过了一些东西 . Ionic 2文档在这个问题上非常沉默 . FormControl上的Angular 2文档似乎暗示它自动支持双向绑定（上面成功的单元测试似乎支持该断言 . ）