I think TestSuite has fallen out of favor. That might have been the style before 4.x, but it's not now as far as I know.
I just annotate the tests I want and then run the class. All the annotated tests are run. I might use Ant, but most of the time I have IntelliJ run them for me.
Of the top of my head create a TestSuite and the invoke addTests. If you want somesource to look at try any opensource lib like hibernate or something from apache and take a look under the test directory of the source for a Tests suite ...