### Question:
DataObjectFeed implements Serializable { public void addAll(List<D> dataObjects) { this.dataObjects.addAll(dataObjects); }  PersistenceException getException(); void setException(PersistenceException exception); void setCount(Integer count); Integer getCount(); boolean isError(); void add(D dataObject); void addAll(List<D> dataObjects); List<D> getAll(); @Override boolean equals(Object o); @Override int hashCode(); static final long serialVersionUID; }### Answer:
@Test public void testAddAll() { List<String> inputs = Arrays.asList("1", "2", "3"); List<String> moreInputs = Arrays.asList("4", "5", "6"); dataObjectFeed.addAll(inputs); Assert.assertTrue(dataObjectFeed.getAll().containsAll(inputs), "Missing inputs in the DataObjectFeed"); dataObjectFeed.addAll(moreInputs); Assert.assertTrue(dataObjectFeed.getAll().containsAll(inputs), "Missing inputs in the DataObjectFeed"); Assert.assertTrue(dataObjectFeed.getAll().containsAll(moreInputs), "Missing extra inputs in the DataObjectFeed"); }