Gradle build succeeds despite broken test set

[brizzbuzz]

Hey, awesome plugin :) Allowed me to remove a nice chunk of boilerplate from my gradle build files :)

Like the title says, at least by default, when a test set cannot be compiled, the default build action still succeeds. This seems like it should at least be a configurable option (apologies if I am missing some obvious gradle magic to make this work out of the box)