angular-testing-library:getByRole 查询仅适用于 hidden: true 选项

Question

我只是在尝试这个库，似乎无法通过他们的 ARIA Angular 色访问元素。
我使用 angular 10.0.6、jest 26.2.1 以及 jest-preset-angular 8.2.1 和 @testing-library/angular 10.0.1。我相信已经按照 https://www.npmjs.com/package/jest-preset-angular 中的描述设置了项目。和 https://testing-library.com/docs/angular-testing-library/intro
这是我要测试的组件:

<h1>{{title}}</h1>
<img src="../assets/chuck-norris-logo.jpg" alt="Chuck Norris Approves!">
<p role="status">{{jokeText}}</p>
<button (click)="refreshJoke()">Refresh</button>

以及一些测试的相关部分:

test('refreshes joke on click', async () => {
    const component = await render(AppComponent);

    const button = component.getByRole('button');
    fireEvent.click(button);
  });

但是，我收到一条错误消息，指出找不到该 Angular 色。

TestingLibraryElementError: Unable to find an accessible element with the role "button"

There are no accessible roles. But there might be some inaccessible roles. If you wish to access them, then set the `hidden` option to `true`. Learn more about this here: https://testing-library.com/docs/dom-testing-library/api-queries#byrole

<div
  id="root1"
  ng-version="10.0.6"
>
  <h1>
    Chuck Norris
  </h1>
  <img
    alt="Chuck Norris Approves!"
    src="../assets/chuck-norris-logo.jpg"
  />
  <p
    role="status"
  >
    Chuck Norris uses canvas in IE.
  </p>
  <button>
    Refresh
  </button>
</div>

我可以通过设置 hidden 来规避这一点。选项 true .

import {configure} from '@testing-library/dom';

configure({
  defaultHidden: true
});

由于我尝试过的其他查询功能(例如 getByText 和 getByTestId )工作正常，而且我从未遇到过类似的 react 问题，我想我以某种方式搞砸了我的配置。
这是我完整的 package.json

{
  "name": "chuck-norris-ng",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "jest",
    "test:watch": "jest --watch",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "~10.0.6",
    "@angular/common": "~10.0.6",
    "@angular/compiler": "~10.0.6",
    "@angular/core": "~10.0.6",
    "@angular/forms": "~10.0.6",
    "@angular/platform-browser": "~10.0.6",
    "@angular/platform-browser-dynamic": "~10.0.6",
    "@angular/router": "~10.0.6",
    "rxjs": "~6.6.0",
    "tslib": "^2.0.0",
    "zone.js": "~0.10.2"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.1000.4",
    "@angular/cli": "~10.0.4",
    "@angular/compiler-cli": "~10.0.6",
    "@testing-library/angular": "^10.0.1",
    "@testing-library/jest-dom": "^5.11.2",
    "@types/jest": "^26.0.7",
    "@types/node": "^12.11.1",
    "codelyzer": "^6.0.0",
    "jest": "^26.2.1",
    "jest-preset-angular": "^8.2.1",
    "protractor": "~7.0.0",
    "ts-node": "~8.3.0",
    "tslint": "~6.1.0",
    "typescript": "~3.9.7"
  },
  "jest": {
    "preset": "jest-preset-angular",
    "setupFilesAfterEnv": [
      "<rootDir>/src/setup-jest.ts"
    ]
  }
}

我已将我的 repo 上传到 GitHub .我做错了什么？

Answer 1

我遇到了同样的问题，我通过删除在 https://www.npmjs.com/package/jest-preset-angular#usage 的“使用”部分中引用的部分 jest 浏览器模拟来解决我的问题。 :
我已删除 以下来自 jest-global-mocks.ts 文件:

Object.defineProperty(window, 'getComputedStyle', {
   value: () => {
      return {
         display: 'none',
         appearance: ['-webkit-appearance'],
      };
   },
});

我见过类似的全局模拟，从 https://www.amadousall.com/how-to-set-up-angular-unit-testing-with-jest/ 之类的文章中引用。 <-- 这篇文章说“模拟全局窗口对象的一些属性和功能，以确保我们的测试可以在 JSDOM 环境中运行。”但我不知道在使用 angular-testing-library 时删除它是否是一个好主意(我也在使用 https://www.npmjs.com/package/@testing-library/jest-dom )。也许其他人可以帮助更详细地解释用例，但现在我很高兴我可以再次使用 getByRole()。