I have an example where a service is injected into a component without the stub/mock for the service, and the test ends up hanging.
Based on this thread, we need to set "emitDecoratorMetadata": true, in the tsconfig.spec.json.
As soon as I add it, the test ends up hanging.
In order to test it, you just need to run npm install and ng test.
I believe this was introduced in the latest versions of Jest, because once I rolled back to older versions of Jest and Preset it is not an issue.
I rolled back to a version of Jest 26.0.1 and keeping the dependencies on that version it is no longer an issue.
However, that means I cannot re-generate the package-lock.json because it will update to a version of 26.1+ and this is when I started noticing the issue.
Angular 10