当在Mockito中使用doReturn时，它没有thenReturn，所以我很困惑为什么它一直抛出UnfinishedStubbingException Unfinished stubbing detected here: E.g. thenReturn() may be missing.。它为我所有的doReturn抛出这个错误。
我的代码：

public List<Users> getUsers(String userId) {
    List<Users> usersList = new ArrayList<>();
    Table table = dynamoDB.getTable("users");
    ItemCollection<QueryOutcome> items = table.getIndex("userIndex").query(QuerySpec);
    Iterator<Item> iterator = items.iterator();
    while (iterator.hasNext()) {
        list.add(Util.jsonToObject(iterator.next().toJSONPretty(), Users.class));
    }
    return usersList;
}

测试类别：

List<Users> mockList = mock(List.class);
    Table mockTable = mock(Table.class);
    Users details = new Users("", "", "");
    ItemCollection<QueryOutcome> mockCollection = mock(ItemCollection.class);
    IteratorSupport<Item, QueryOutcome> mockIterator = mock(IteratorSupport.class);
    doReturn(mockTable).when(dynamoDB.getTable("users"));
    doReturn(mockCollection).when(mockTable.getIndex("")).query(mock(QuerySpec.class));
    doReturn(mockIterator).when(mockCollection).iterator();
    doReturn(true).doReturn(false).when(mockIterator).hasNext();
    doReturn(true).when(mockList).add(details);
    assertNotNull(dynamoService.getUser("").get(0));