What is the difference between Google Closure and AngularJS approaches of unit testing?

I just received a project of a medium size which contains a lot of Closure unit tests. I'm going to rewrite the GUI part in AngularJS. Regarding this I have some questions:

1. Is it fine to test AngularJS with Closure tests?
2. What benefits will I have from rewriting Closure tests to AngularJS? Is it worth rewriting?

I'm new to both Closure and Angular, please forgive me if I misused some terms.