	public void testContributeWithBadContributorId() {
		try {
			counter.contribute(digitalCard, new UserUrl("bob", "deus.org"));
			fail("contribution with different contributor id than in the DC is possible");
		}
		catch(RuntimeException e) {
			assertEquals("ID of the contributor does not match the id in the digital card!", e.getMessage());
		}
	}

	public void testContributeWithBadContributorId() {
		try {
			counter.contributeOther(digitalCard, new UserUrl("bob", "deus.org"));
			fail("contribution with different contributor id than in the DC is possible");
		}
		catch(RuntimeException e) {
			assertEquals("ID of the contributor does not match the id in the digital card!", e.getMessage());
		}
	}
