### Question:
TalendInputOutputEntity 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); } TalendInputOutputEntity(String jobId, String componentName); void addNextEntity(String entityId); void addPreviousEntity(String entityId); List<EndPointProxy> getSourceProxies(); void setSourceProxies(List<EndPointProxy> sourceProxies); List<EndPointProxy> getTargetProxies(); void setTargetProxies(List<EndPointProxy> targetProxies); List<String> getPreviousEntitiesId(); List<String> getNextEntitiesId(); @Override void connectToEntity(List<String> inputs, List<String> outputs); @Override String toString();  }### Answer:
@Test public void testAddNextEntity() { TalendInputOutputEntity tioe = new TalendInputOutputEntity("job", "component1"); assertEquals(0, tioe.getPreviousEntitiesId().size()); tioe.addPreviousEntity("component2"); assertEquals(1, tioe.getPreviousEntitiesId().size()); assertEquals("component2", tioe.getPreviousEntitiesId().get(0)); assertEquals(1, tioe.getSourceProxies().size()); tioe.addPreviousEntity("component3"); assertEquals(2, tioe.getPreviousEntitiesId().size()); assertEquals("component2", tioe.getPreviousEntitiesId().get(0)); assertEquals("component3", tioe.getPreviousEntitiesId().get(1)); assertEquals(2, tioe.getSourceProxies().size()); assertEquals(0, tioe.getNextEntitiesId().size()); tioe.addNextEntity("component4"); assertEquals(1, tioe.getNextEntitiesId().size()); assertEquals("component4", tioe.getNextEntitiesId().get(0)); assertEquals(1, tioe.getTargetProxies().size()); tioe.addNextEntity("component5"); assertEquals(2, tioe.getNextEntitiesId().size()); assertEquals("component4", tioe.getNextEntitiesId().get(0)); assertEquals("component5", tioe.getNextEntitiesId().get(1)); assertEquals(2, tioe.getTargetProxies().size()); assertEquals("[component2, component3]---> component1 (" + GeneratorID.generateEntityID("job", "component1") + ") --->[component4, component5]", tioe.toString()); }