I am working on an application that uses https://nx.dev/ and https://angular.dev/ and is configured with https://jestjs.io/ to run unit tests.

I normally use this command to generate new Angular libraries inside the project:

npx nx generate @nx/angular:library

When selecting "jest" as unitTestRunner (which is our default), it correctly configures the project.json with a "test" target as well as adding the necessary configuration files for unit testing (e.g. tsconfig.spec.json, jest.config.ts, test-setup.ts and a placeholder test).

Unfortunately, many of the existing libraries in the project were generated without the test target and I would like to add them programmatically.

How can I achieve that?

In other words, I need a way to generate the testing configuration (i.e. change project.json with a "test" target and add the configuration files tsconfig.spec.json, jest.config.ts, test-setup.ts) for all the libraries that currently do not have any "test" target.