### Question:
TalendOutputEntity extends TalendEntity { public void addNextEntity(String entityId) { this.nextEntitiesId.add(entityId); EndPointProxy endpointProxy = new EndPointProxy(entityId, SourceType.SDK, EntityType.OPERATION_EXECUTION); this.targetProxies.add(endpointProxy); } TalendOutputEntity(String jobId, String componentName); void addPreviousEntity(String entityId); void addNextEntity(String entityId); List<String> getPreviousEntitiesId(); List<String> getNextEntitiesId(); List<EndPointProxy> getSourceProxies(); List<EndPointProxy> getTargetProxies(); @Override String toString(); @Override void connectToEntity(List<String> inputs, List<String> outputs);  }### Answer:
@Test public void testAddNextEntity() { TalendOutputEntity toe = new TalendOutputEntity("job", "component1"); assertEquals(0, toe.getPreviousEntitiesId().size()); toe.addPreviousEntity("component2"); assertEquals(1, toe.getPreviousEntitiesId().size()); assertEquals("component2", toe.getPreviousEntitiesId().get(0)); assertEquals(1, toe.getSourceProxies().size()); toe.addPreviousEntity("component3"); assertEquals(2, toe.getPreviousEntitiesId().size()); assertEquals("component2", toe.getPreviousEntitiesId().get(0)); assertEquals("component3", toe.getPreviousEntitiesId().get(1)); assertEquals(2, toe.getSourceProxies().size()); assertEquals("[component2, component3]---> component1 (" + GeneratorID.generateEntityID("job", "component1") + ")", toe.toString()); }