Per class(es) logging settings in testsuite

Just brainstorming:

It'd be very useful to have a way to run the testsuite with normal logging settings but have the ability to define one or more test classes as having TRACE on x.y.z. This could be useful for those elusive failures that only happen when the testsuite runs! Clearly, it'd need some programmatic magic to enable/disable the logging at runtime, but there's some benefit to all this.