Angular2 测试 "Cannot find name 'HTMLElement'"

Question

我正在尝试将测试引入我现有的项目，但我一直运行陷入同样的错误，我认为这禁止我进行运行测试。我得到的错误是

ERROR in .../src/app/dashboard.component.spec.ts (15,13): Cannot find name 'HTMLElement'.)

Chrome 57.0.2987 (Mac OS X 10.12.3): Executed 4 of 4 SUCCESS (7.24 secs / 6.55 secs)

我的 dashboard.component.spec.ts 看起来像这样：

import { async, ComponentFixture, TestBed } from '@angular/core/testing';
import { By } from '@angular/platform-browser';
import { DebugElement } from '@angular/core';

import { DashboardComponent } from './dashboard.component';
import { ExchangeService } from './exchange.service';

describe('DashboardComponent (templateUrl)', () => {

    let comp: DashboardComponent;
    let fixture: ComponentFixture<DashboardComponent>;

    let spy: jasmine.Spy;
    let de: DebugElement;
    let el: HTMLElement; // how does this work...?
    let exchangeService: ExchangeService; // the actual injected service

    const testExchange = 'New York Stock Exchange';

    beforeEach(async(() => {
        TestBed.configureTestingModule({
            declarations: [ DashboardComponent ],
            providers: [ ExchangeService ],
        })
        .compileComponents();
    }))


    beforeEach(() => {

        fixture = TestBed.createComponent(DashboardComponent);
        comp = fixture.componentInstance; // DashboardComponent test componentInstance

        // ClockService actually injected into the component
        exchangeService = fixture.debugElement.injector.get(ExchangeService);

        // Setup spy on the `getExchanges` method
        spy = spyOn(exchangeService, 'getExchanges')
            .and.returnValue(Promise.resolve(testExchange));
        // query for the title <h1> by CSS element selector
        
        de = fixture.debugElement.query(By.css('.exchange'));
        el = de.nativeElement;
    });

    it('should not show exchange before OnInit', () => {
        expect(el.textContent).toBe('', 'nothing displayed');
        expect(spy.calls.any()).toBe(false, 'getExchanges not yet called');
    });

    it('true is true', () => expect(false).toBe(true));
});

我已经四处搜索该错误消息，但我似乎无法在任何地方找到它。另外，最后一个测试应该会失败，但我认为它甚至不会因为这个错误而编译。关于什么是错误的任何线索？我最初认为这将是我丢失的导入，但我看不到其他人导入 HTMLElements。谢谢！

编辑： 我的 tsconfig.json 看起来像这样：

{
  "compileOnSave": false,
  "compilerOptions": {
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "moduleResolution": "node",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "target": "es5",
    "lib": [
      "es6",
      "dom",
      "es2015.iterable"
    ]
  }
}

编辑 2： 我实际上必须按 Ctrl+C，然后重新启动测试才能正确编译（我认为它会在文件更改时执行，但事实并非如此）。谢谢！

Answer 1

在测试项目的 tsconfig.json 中，您应该将 dom 库添加到 lib 数组：

"lib": ["es6", "dom", "es2015.iterable"],

Answer 2

我在连续测试时遇到了同样的问题，但没有一个运行。测试将在初始运行上编译，但是当我更改任何代码时，编译将停止并出现

Cannot find name 'HTMLElement'

错误消息，我不得不执行 Ctr+C 并重新启动。
将 tsconfig.spec.json 更改为

"lib": ["es6", "dom"],

按照 PierreDuc 的建议解决了问题，我的测试套件运行在连续模式下。

Answer 3

我也打错了HTMLElement，例如。我做到了 HtmlElement。希望这可以帮助。

Angular2 测试 "Cannot find name 'HTMLElement'"

Angular2 Testing "Cannot find name 'HTMLElement'"

angular

jasmine

karma-jasmine

angular2-testing