I need to implement an automation test for ClaimCenter 8.0.7. I want to build test cases quickly and easily. From this need, I think about Guidewire Testing Framework that pre-builds test cases.

However, according to Guidewire documentation, this framework is only supported on Guidewire Cloud Platform (Elysian, Flaine, etc.). The only way is that I have to implement test cases from scratch by using Selenium library. As a question, Which program (Python, Gosu, Java, etc.) should I use to write test cases quickly as well as manage them easily?