Spring Cloud application and end-to-end automatic testing

I have an application based on Spring Cloud. It means I am using Eureka server service discovery and the system has couple of microservices. Can you recommend me any approach how to make automatic ent-to-end tests across my system? I have Docker so It is easy to start system. Of course I know SOAPui etc. but is here any way how to write these tests at Java and keep them in the project?