Here is commented out code and new method.
We changed shouldPurgeAConceptClass() to shouldPurgeAConceptSource() right?
Is that right?
	//	@Test
	//	public void shouldPurgeAConceptClass() throws Exception {
	//		int originalCount = service.getAllConceptClasses().size();
	//		String uuid = "77177ce7-1410-40ee-bbad-ff6905ee3095";
	//		controller.purge(uuid, request, response);
	//		Assert.assertNull(service.getConceptClassByUuid(uuid));
	//		Assert.assertEquals(originalCount - 1, service.getAllConceptClasses().size());
	//	}
	// NEW
	public void shouldPurgeAConceptSource() throws Exception {
		String uuid = "77177ce7-1410-40ee-bbad-ff6905ee3095";

		Assert.assertNotNull(service.getConceptSourceByUuid(uuid));
		MockHttpServletRequest req = request(RequestMethod.DELETE, getURI() + "/" + uuid);
		req.addParameter("purge", "");
		handle(req);
		Assert.assertNull(service.getConceptSourceByUuid(uuid));
	}