Like this?

@Test
	public void purgeConceptClass_shouldPurgeAConceptClass() throws Exception {
		String uuid = "97097dd9-b092-4b68-a2dc-e5e5be961d42";
		//MockHttpServletRequest req = request(RequestMethod.DELETE, getURI() + "/" + getUuid());
		MockHttpServletRequest req = request(RequestMethod.DELETE, getURI() + "/" + uuid());
		req.addParameter("!purge", "");
		handle(req);

		Assert.assertNull(service.getConceptClassByUuid(getUuid()));
	}