The class instead provides an empty tearDown method - which means that none of
the processes created are destroyed if things fail.

Looking at the code:

    public void testHaveSysRoot() {
	if (unresolved(5657))
	    return;
	File testSysRootDir = Config.getPkgDataFile("test-sysroot");
	File testPath = Config.getPkgLibFile("funit-addresses");
	child = new Expect(new String[] {
		Config.getBinFile("fhpd").getAbsolutePath(),
		"-sysroot", testSysRootDir.getAbsolutePath(),
	        testSysRootDir.getAbsolutePath() + "/" + testPath
	    });

perhaps HpdTestbed can to be extended to better support this, or knowing this is
special, more closely follow what start does.