javascript - 尝试使用 angular 4 和 ionic 3 测试基本形式时没有值访问器

Question

我有一个简单的 ionic 形式:

<ion-header>
    <ion-navbar>
        <ion-title>Foo</ion-title>
    </ion-navbar>
</ion-header>

<ion-content padding>
    <form [formGroup]="fooForm">
        <ion-item>
            <ion-label floating>Name</ion-label>
            <ion-input formControlName="name" type="text"></ion-input>
        </ion-item>
    </form>
    <button ion-button full color="primary" (click)="save()">Save</button>
</ion-content>

和一个页面组件:

import { Component } from '@angular/core';
import { FormBuilder, FormGroup } from '@angular/forms';

@Component({
    selector: 'fo-page-foo',
    templateUrl: './foo.html'
})
export class FooPage {
    fooForm: FormGroup;

    constructor(public formBuilder: FormBuilder) {
    }

    ngOnInit() {
        this.fooForm = this.formBuilder.group({
            name: ['']
        });

    }

    public save() {
        console.log(this.fooForm.value);
    }
}

和一个测试:

import { FooPage } from './foo';
import { TestBed, ComponentFixture } from '@angular/core/testing';
import { CUSTOM_ELEMENTS_SCHEMA, DebugElement } from '@angular/core';
import { FormsModule, ReactiveFormsModule } from "@angular/forms";
import { Form } from 'ionic-angular';

describe('Foo Page:', () => {

    let comp: FooPage;
    let fixture: ComponentFixture<FooPage>;
    let de: DebugElement;

    beforeEach(() => {
        TestBed.configureTestingModule({
            schemas: [CUSTOM_ELEMENTS_SCHEMA],
            declarations: [FooPage],
            providers: [Form],
            imports: [FormsModule, ReactiveFormsModule],
        });
        fixture = TestBed.createComponent(FooPage);
        fixture.detectChanges();
        comp = fixture.componentInstance;
        de = fixture.debugElement;
        comp.ngOnInit();
    });

    describe('.constructor()', () => {
        it('Should be defined', () => {
            expect(comp).toBeDefined();
        });
    });
});

项目和测试结构基于https://github.com/marcoturi/ionic-boilerplate .由于错误，测试失败:No value accessor for form control。

我正在尝试各种方法，但似乎 Ionic 细节和最近的 Angular 4 的组合使得它需要添加一些额外的配置，并且由于 Angular 的变化，一些现有的解决方案不再有效。

Answer 1

我两天前遇到了这个问题，感谢将其隔离并发布在 SO 上，因此能够找到基于 slightly similar question 的解决方案

要点是将 IonicModule 添加到 imports 但这会触发一堆其他 Ionic 导入:

import {
    App, Platform, Config, Keyboard,
    Form, IonicModule, DomController
} from 'ionic-angular';
import { 
    mockConfig, mockDomController, MockPlatform, mockPlatform 
} from 'ionic-angular/util/mock-providers';

因此更新后的beforeEach应该以

开头

    TestBed.configureTestingModule({
        schemas: [CUSTOM_ELEMENTS_SCHEMA],
        declarations: [FooPage],
        providers: [
            App,
            Form,
            Keyboard,
            { provide: Platform, useClass: MockPlatform },
            { provide: DomController, useValue: mockDomController(mockPlatform()) },
            { provide: Config, useValue: mockConfig() },
        ],
        imports: [
            FormsModule,
            IonicModule,
            ReactiveFormsModule
        ],
    });

上述示例的 PR 已经合并到 https://github.com/marcoturi/ionic-boilerplate .