我刚刚使用https://update.angular.io/提供的步骤将我的 Angular 应用程序从 Angular 11 升级到 12 。我能够编译并运行。但是，当我运行时npm test，我的所有测试都出现以下错误：
> npm run env -s && ng test\n\n\xe2\xa0\x99 Generating browser application bundles (phase: building)...13 08 2021 17:49:51.294:WARN [karma]: No captured browser, open http://localhost:9880/\n13 08 2021 17:49:51.334:INFO [karma-server]: Karma v6.3.4 server started at http://localhost:9880/\n13 08 2021 17:49:51.334:INFO [launcher]: Launching browsers ChromeHeadlessNoSandbox with concurrency unlimited\n13 08 2021 17:49:51.337:INFO [launcher]: Starting browser ChromeHeadless\n\xe2\x9c\x94 Browser application bundle generation complete.\n13 08 2021 17:50:22.921:WARN [karma]: No captured browser, open http://localhost:9880/\n13 08 2021 17:50:22.999:INFO …您有没有人知道如何使用C#的流媒体API？因此,只要我的帐户中有新的推文,它就会反映在我的计划中.