Question

我有以下代码，我试图模仿：

public void getOrders(Response response){
    logger.log("Getting all orders");

    DynamoDBScanExpression scanExpression = new DynamoDBScanExpression()
            .withProjectionExpression("OrderId");

    PaginatedScanList<Orders> orders = dynamoDBMapper.scan(Orders.class, scanExpression);

    response.setData(orders..stream()
            .collect(Collectors.toList()));
}

我试图模仿的方式是：

Mockito.when(mockDynamoDBMapper.scan(Orders.class, 
             Mockito.any())).thenReturn(mockPaginatedList);

我得到以下异常：

如果匹配器与原始值组合，则可能会发生此异常： //不正确： someMethod（anyObject（），＆＃34; raw String＆＃34;）;使用匹配器时，所有参数都必须由匹配器提供。例如： //正确： someMethod（anyObject（），eq（＆＃34; matcher by matcher＆＃34;））; 有关更多信息，请参阅Matchers类的javadoc。

我应该如何使用任何dbmapper.scan对象模拟DynamoDBScanExpression方法？

Answer 1

错误对您的问题有明确的答案。你想要的是：

Mockito.when(mockDynamoDBMapper.scan(eq(Orders.class), 
             Mockito.any())).thenReturn(mockPaginatedList);

必须为匹配器提供匹配器 - eq（Orders.class），而不是原始值 - Orders.class

Answer 2

一般来说，我所做的是首先模拟 PaginatedScanList，它是 mapper.scan() 给我们的响应类型，然后我将该响应模拟分配给它在扫描 () 时为映射器创建的模拟被称为

    // here I define the values that will be assigned to the filter
    Map <String, AttributeValue> expressionAttributeValues = new HashMap <> ();
    expressionAttributeValues.put (": attributeValue", new AttributeValue (). withS ("value"));
    // the definition of the epxpression for the scan
    DynamoDBScanExpression scanExpression = new DynamoDBScanExpression ();
    scanExpression.setLimit (1); // amount of data to return
    scanExpression.setFilterExpression (("email =: attributeValue")); // the attribute to filter by
    scanExpression.setProjectionExpression ("id"); // the data to return from the row or json
    scanExpression.setExpressionAttributeValues (expressionAttributeValues); // place the value by which to filter

    DynamoDBMapper mapper = mock (DynamoDBMapper.class); // The mock was created for the mapper, which is the one with different methods such as query, scan, etc.
    PaginatedScanList scanResultPage = mock (PaginatedScanList.class); // definition of the mock for the scan result

    when (scanResultPage.size ()). then (invocation -> 3); // what to return when the PaginatedScanList is called

    when (mapper.scan (Person.class, scanExpression)). then (invocation -> scanResultPage); // here returns our mocked PaginatedScanList for the scan function

如何模拟dynamodbmapper扫描

2 个答案: