Test Generators - State of Technology
Maybe an overview of testgenerators is interesting to you. A quite complete list could be found on the summary of Zoltán Micskei about Code-based test generation. Most of the listed projects are mainly of academic value - fine for example code, yet not fit for practice.
If you are interested in usable test generators for java, you should consider:
One missing academic approach yet has only prototypical implementations:
- SymbolicPathFinder (symbolic execution)
In my Presentations at XP-Days 2018 Testgeneration in Java - an Overview we will discuss some these tools in detail.