This is the actual error:
You will have to add a new test dependency in the subproject’s POM.
It is, but you would be stuck with Java 7, hence preventing tools like lambda expressions. Eventually OpenMRS pre 2.x and Java 7 will not be supported anymore. The current exercise is a bit convoluted but one day or another everything will end up happening in 2.x subprojects, so we could as well start now.