@Test
public void evaluateShouldReturnAllPatientsCurrentlyActiveOnDrugs() throws Exception { 

	cohortDefinition.setActiveOnOrAfter(new Date());
	Cohort cohort = Context.getService(CohortDefinitionService.class).evaluate(cohortDefinition, null);
	Assert.assertTrue(cohort.contains(2));
	Assert.assertTrue(cohort.contains(22));
	Assert.assertTrue(cohort.contains(7));
	Assert.assertEquals(3, cohort.size());
}