@Test
public void evaluateShouldReturnAllPatientsThatHaveTakenAllListedDrugs() throws Exception { 

	List drugSetList = new ArrayList<Concept>();
	drugSetList.add(new Concept(88));
	drugSetList.add(new Concept(792));
	cohortDefinition.setDrugSets(drugSetList);
	cohortDefinition.setWhich(Match.ALL);
	Cohort cohort = Context.getService(CohortDefinitionService.class).evaluate(cohortDefinition, null);
	Assert.assertEquals(1, cohort.size());
	Assert.assertTrue(cohort.contains(2));
}