"Can't resolve all parameters for MdDialogRef: (?)" 测试 NG2 材质对话框组件时出错

Question

我的登录组件如下：

import { Component, OnInit } from '@angular/core';
import { MdDialogRef } from '@angular/material';
import { AuthService } from '../../core/services/auth.service';
@Component({
  templateUrl: './login.component.html',
  styleUrls: ['./login.component.scss']
})
export class LoginDialogComponent implements OnInit {
  model: {
    email: string,
    password: string
  };
  error;
  constructor(
    private authService: AuthService,
    private dialogRef: MdDialogRef<LoginDialogComponent>
  ) { }
  ngOnInit() {
    this.model = {
      email: '',
      password: ''
    };
  }
  signin() {
    this.error = null;
    this.authService.login(this.model.email, this.model.password).subscribe(data => {
      this.dialogRef.close(data);
    }, err => {
      this.error = err.json();
    });
  }
}

我对此组件有一个测试规格，如下所示：

import { async, ComponentFixture, TestBed } from '@angular/core/testing';
import { MdDialogRef, OverlayRef  } from '@angular/material';
import { AuthService } from '../../core/services/auth.service';
import { LoginDialogComponent } from './login.component';
describe('Component: Login', () => {
    let component: LoginDialogComponent;
    let fixture: ComponentFixture<LoginDialogComponent>;
    beforeEach(async(() => {
        TestBed.configureTestingModule({
            declarations: [
                LoginDialogComponent
            ],
            imports: [],
            providers: [
                AuthService,
                MdDialogRef,
                OverlayRef
            ]
        })
            .compileComponents();
    }));
    beforeEach(() => {
        fixture = TestBed.createComponent(LoginDialogComponent);
        component = fixture.componentInstance;
        fixture.detectChanges();
    });
    it('should create', () => {
        expect(component).toBeTruthy();
    });
});

我尝试了一百万个不同的事情，无论我做什么，我都会收到以下错误：

无法解析mddialogref的所有参数：（？）

这是MDDialogRef的代码，该代码只有1个参数overlayref。我想念什么？

import { OverlayRef } from '../core';
import { Observable } from 'rxjs/Observable';
/**
 * Reference to a dialog opened via the MdDialog service.
 */
export declare class MdDialogRef<T> {
    private _overlayRef;
    /** The instance of component opened into the dialog. */
    componentInstance: T;
    /** Subject for notifying the user that the dialog has finished closing. */
    private _afterClosed;
    constructor(_overlayRef: OverlayRef);
    /**
     * Close the dialog.
     * @param dialogResult Optional result to return to the dialog opener.
     */
    close(dialogResult?: any): void;
    /** Gets an observable that is notified when the dialog is finished closing. */
    afterClosed(): Observable<any>;
}

编辑：从 @ryan的评论中获取线索，我尝试完全删除mddialogref提供商，并收到以下错误：

无法解析覆盖的所有参数：（？，？，？）

这使我相信这个问题实际上是在试图解决覆盖层，而不是w/mddialogref本身。

工作示例以下代码是实际工作代码，根据Yurzui的建议。

    /* tslint:disable:no-unused-variable */
import { NgModule } from '@angular/core';
import { async, TestBed } from '@angular/core/testing';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';
import { MaterialModule, MdDialogModule, MdToolbarModule, MdDialog, MdDialogRef } from '@angular/material';
import { CoreModule } from '../../core/core.module';
import { LoginDialogComponent } from './login.component';
@NgModule({
    declarations: [
        LoginDialogComponent
    ],
    entryComponents: [
        LoginDialogComponent
    ],
    exports: [
        LoginDialogComponent
    ],
    imports: [
        CommonModule,
        CoreModule,
        FormsModule,
        MaterialModule.forRoot(),
        MdDialogModule.forRoot(),
        MdToolbarModule.forRoot()
    ]
})
class LoginDialogSpecModule { }
describe('Component: Login Dialog', () => {
    let component: LoginDialogComponent;
    let dialog: MdDialog;
    beforeEach(() => {
        TestBed.configureTestingModule({
            imports: [
                LoginDialogSpecModule
            ]
        });
    });
    beforeEach(() => {
        dialog = TestBed.get(MdDialog);
        let dialogRef = dialog.open(LoginDialogComponent);
        component = dialogRef.componentInstance;
    });
    it('should create', () => {
        expect(component).toBeTruthy();
    });
});

Answer 1

存在问题 componentFactoryResolver不知道通过testbed

编译的组件

根据此问题，Angular2团队通过使用entryComponents属性创建真实模块来提供解决方法https://github.com/angular/material2/blob/2.0.0.0-beta.1/src/lib/dialog/dialog/dialog.spec.ts#l387-l402

这样您的测试可以这样写：

import { MdDialog, MdDialogModule } from '@angular/material';   
@NgModule({
    declarations: [TestComponent],
    entryComponents: [TestComponent],
    exports: [TestComponent],
})
class TestModule { }
describe('Component: Login', () => {
    let component: TestComponent;
    let dialog: MdDialog;
    beforeEach(() => {
        TestBed.configureTestingModule({
            imports: [TestModule, MdDialogModule]
        });
    });
    beforeEach(() => {
        dialog = TestBed.get(MdDialog);
        let dialogRef = dialog.open(TestComponent);
        component = dialogRef.componentInstance;
    });
    it('should create', () => {
        expect(component).toBeTruthy();
    });
});

plunker示例

Answer 2

我正常运行代码时会遇到相同的错误，即我没有编写测试用例。

我发现我的主要组件中的线provides: [ MdDialogRef ]给出了完全相同的错误，并且一切都在没有它的情况下起作用。