Add additional DSL tests

[mhsmith]

For example:

    def test_base_kotlin(self):
        pass  # FIXME


# FIXME for each element:
#     include both dot and brace notation
#     include both method and property notation
class Dsl(GradleTestCase):
    def test_old(self):
        pass  # FIXME

    def test_new_groovy(self):
        pass  # FIXME

    def test_new_kotlin(self):
        pass  # FIXME