Start .class file from .jar archive as Junit-Test with gradle

Hey everybody,

i have an jar-archive “swa_runningeasy_testdriver_v2.jar”.
It contains the package “swa.runningeasy.junit” with different .class files of compiled JUnit-Test Java Files.

Is there a way to run this class-files with gradle as Junit-Tests?

Thx 4 ur help!