i noticed, that the default for the junit-filterpattern includes
class-names 'Test*'. for me this produced problems with a class
called 'com.mycompany.myapp.TestDaten' that resides in the
/src/test/test/groovy dir. i fix this be doing an explizit:

test {
include '**/*Tests.class'
include '**/*Test.class'
exclude '*/Abstract.class'
exclude '*/Test.class'
}

out of my (selfish) perspective the following pattern should be
default:

test {
include '**/*Tests.class'
include '**/*Test.class'
exclude '*/Abstract.class'
}

i would be happy too, if i could change the default-pattern
easily and DRY by setting conventions.