Wouldn't it be great if we could generate unit test cases automatically?
EvoSuite
https://www.veracode.com/blog/research/automated-unit-test-generation-java
https://www.evosuite.org/
Agitar
http://www.agitar.com/solutions/products/automated_junit_generation.html
Other tools
https://stackoverflow.com/a/27998399/1323562