Have to agree with the previous person. Never saw a relevant project made from Groovy. Even with Beanshell I've included it a few times in other projects for basic scripting/customization within the app but groovy? Never in 15 years to now.

I think embedding and testing/plugins/DSLs really is the main use-case. It's a terrible fit for a CLI tool if you've got to wait for a JVM to boot up, especially in a world where people are now used to those kinds of things being instantaneous rust or go binaries.

We use the Spock Framework for testing. It's the best testing framework in the JVM, no joke.