[libvirt] how to test libvirt?

Hi all: AFAIK, there're several ways to test libvirt: 1) virt-test, which is driven by autotest or avocado-vt, based on qemu-kvm 2) test driver which is parall to other drivers such as qemu_driver and libxl_driver in libvirt. 3) make -c tests, which aims to do low level tests, that is to test function modules of libvirt. 4) libvirt-test-API I've got 2 questions: 1) besides the 4 test suites, are there any other automatic-test tools? 2) is there any testsuite used to test libxl_driver, similar to virt-test? Anyone knows that? Thanks in advance. Oscar.