angular/packages/elements/test/create-custom-element-env_spec.ts

/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

import {Component} from '@angular/core';
import {createApplication} from '@angular/platform-browser';
import {browserDetection} from '@angular/platform-browser/testing/src/browser_util';

import {createCustomElement} from '../public_api';

if (browserDetection.supportsCustomElements) {
  describe('createCustomElement with env injector', () => {
    let testContainer: HTMLDivElement;

    beforeEach(() => {
      testContainer = document.createElement('div');
      document.body.appendChild(testContainer);
    });

    afterEach(() => {
      document.body.removeChild(testContainer);
      (testContainer as any) = null;
    });

    it('should use provided EnvironmentInjector to create a custom element', async () => {
      @Component({
        standalone: true,
        template: `Hello, standalone element!`,
      })
      class TestStandaloneCmp {
      }

      const appRef = await createApplication();

      try {
        const NgElementCtor = createCustomElement(TestStandaloneCmp, {injector: appRef.injector});

        customElements.define('test-standalone-cmp', NgElementCtor);
        const customEl = document.createElement('test-standalone-cmp');
        testContainer.appendChild(customEl);

        expect(testContainer.innerText).toBe('Hello, standalone element!');
      } finally {
        appRef.destroy();
      }
    });
  });
}